An object distance of 49.5 cm creates a virtual image located 1 cm in front of the lens, with a magnification of -1.An object distance of 14.9 cm creates a virtual image located 7.45 cm in front of the lens, with a magnification of -1.5.An object distance of 29.7 cm creates a virtual image located 1 cm in front of the lens, with a magnification of -1.
For an object distance of 49.5 cm, Image distance = -49.5 cm, image location = 1 cm in front of the lens, magnification = -1.The negative sign indicates that the image is virtual, upright, and diminished. When the image distance is negative, it is virtual, and when it is positive, it is real.
When the magnification is negative, the image is inverted, and when it is positive, it is upright.
An object distance of 49.5 cm creates a virtual image located 1 cm in front of the lens, with a magnification of -1.
For an object distance of P2 = 14.9 cm, tImage distance = -22.35 cm, image location = 7.45 cm in front of the lens, magnification = -1.5.
The negative sign indicates that the image is virtual, upright, and magnified. When the image distance is negative, it is virtual, and when it is positive, it is real. When the magnification is negative, the image is inverted, and when it is positive, it is upright.
An object distance of 14.9 cm creates a virtual image located 7.45 cm in front of the lens, with a magnification of -1.5.
For an object distance of P3 = 29.7 cm, Image distance = -29.7 cm, image location = 1 cm in front of the lens, magnification = -1.
The negative sign indicates that the image is virtual, upright, and of the same size as the object. When the image distance is negative, it is virtual, and when it is positive, it is real. When the magnification is negative, the image is inverted, and when it is positive, it is upright.
An object distance of 29.7 cm creates a virtual image located 1 cm in front of the lens, with a magnification of -1.
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The difference in frequency between the first and the fifth harmonic of a standing wave on a taut string is f5 - f1 = 50 Hz. The speed of the standing wave is fixed and is equal to 10 m/s. Determine the difference in wavelength between these modes
The difference in frequency between the first and the fifth harmonic of a standing wave on a taut string is f5 - f1 = 50 Hz. The speed of the standing wave is fixed and is equal to 10 m/s.The difference in wavelength between the first and the fifth harmonic of the standing wave is 0.2 meters.
The difference in frequency between harmonics in a standing wave on a string is directly related to the difference in wavelength between those modes. To find the difference in wavelength, we can use the formula:
Δλ = c / Δf
Where:
Δλ is the difference in wavelength,
c is the speed of the wave (10 m/s in this case), and
Δf is the difference in frequency (f5 - f1 = 50 Hz).
Substituting the given values into the formula:
Δλ = (10 m/s) / (50 Hz)
Simplifying:
Δλ = 0.2 m
Therefore, the difference in wavelength between the first and the fifth harmonic of the standing wave is 0.2 meters.
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1a. What is the rotational inertia about the center of mass of a metal rod of length 0.50m and mass 2.0kg?
b. Recalculate what the rotational inertia would be if it were rotated through an axis located 0.10 meters from its center.
Any help i appreciated. Thank you in advance :)
The rotational inertia about the center of mass of a metal rod can be calculated using the formula I = (1/12) * m * L^2, where I is the rotational inertia, m is the mass of the rod, and L is the length of the rod.
In this case, the mass of the rod is given as 2.0 kg and the length is 0.50 m. Substituting these values into the formula, we have I = (1/12) * 2.0 kg * [tex](0.50 m)^2[/tex] = 0.0417 kg·[tex]m^2[/tex].If the rod were rotated through an axis located 0.10 meters from its center, we need to calculate the new rotational inertia.
The parallel axis theorem states that the rotational inertia about an axis parallel to and a distance "d" away from an axis through the center of mass is given by I_new = I_cm + m * [tex]d^2[/tex], where I_cm is the rotational inertia about the center of mass and m is the mass of the object.
In this case, the rotational inertia about the center of mass (I_cm) is 0.0417 kg·[tex]m^2[/tex], and the distance from the center of mass to the new axis (d) is 0.10 meters. Substituting these values into the formula, we have I_new = 0.0417 kg·[tex]m^2[/tex] + 2.0 kg * [tex](0.10 m)^2[/tex] = 0.0617 kg·[tex]m^2[/tex].
In summary, the rotational inertia about the center of mass of the metal rod is 0.0417 kg·[tex]m^2[/tex]. If it were rotated through an axis located 0.10 meters from its center, the new rotational inertia would be 0.0617 kg·[tex]m^2[/tex].
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A student of mass 63.4 ka. startino at rest. slides down a slide 16.2 m lona. tilted at an anale of 32.1° with respect to the horizontal. If the coefficient of kinetic friction between the student and the slide is 0.108. find the force of kinetic friction. the acceleration.
sweed she is cravenne when she reaches the doccon or de slue. cmer the macnicuces..
the force of linetic friction tie MI
The force of kinetic friction is approximately 56.89 N, the acceleration is approximately 4.83 m/s^2, and the final speed at the bottom of the slide is approximately 7.76 m/s.
To solve this problem, let's break it down into smaller steps:
1. Calculate the force of kinetic friction:
The force of kinetic friction can be calculated using the formula:
Frictional force = coefficient of kinetic friction × normal force
The normal force can be found by decomposing the weight of the student perpendicular to the slide. The normal force is given by:
Normal force = Weight × cos(angle of the slide)
The weight of the student is given by:
Weight = mass × acceleration due to gravity
2. Calculate the acceleration:
Using Newton's second law, we can calculate the acceleration of the student:
Net force = mass × acceleration
The net force acting on the student is the difference between the component of the weight parallel to the slide and the force of kinetic friction:
Net force = Weight × sin(angle of the slide) - Frictional force
3. Determine the speed at the bottom of the slide:
We can use the kinematic equation to find the final speed of the student at the bottom of the slide:
Final speed^2 = Initial speed^2 + 2 × acceleration × distance
Since the student starts from rest, the initial speed is 0.
Now let's calculate the values:
Mass of the student, m = 63.4 kg
Length of the slide, d = 16.2 m
Angle of the slide, θ = 32.1°
Coefficient of kinetic friction, μ = 0.108
Acceleration due to gravity, g ≈ 9.8 m/s^2
Step 1: Calculate the force of kinetic friction:
Weight = m × g
Weight = m × g = 63.4 kg × 9.8 m/s^2 ≈ 621.32 N
Normal force = Weight × cos(θ)
Normal force = Weight × cos(θ) = 621.32 N × cos(32.1°) ≈ 527.07 N
Frictional force = μ × Normal force
Frictional force = μ × Normal force = 0.108 × 527.07 N ≈ 56.89 N
Step 2: Calculate the acceleration:
Net force = Weight × sin(θ) - Frictional force
Net force = Weight × sin(θ) - Frictional force = 621.32 N × sin(32.1°) - 56.89 N ≈ 306.28 N
Acceleration = Net force / m
Acceleration = Net force / m = 306.28 N / 63.4 kg ≈ 4.83 m/s^2
Step 3: Determine the speed at the bottom of the slide:
Initial speed = 0 m/s
Final speed^2 = 0 + 2 × acceleration × distance
Final speed = √(2 × acceleration × distance)
Final speed = √(2 × acceleration × distance) = √(2 × 4.83 m/s^2 × 16.2 m) ≈ 7.76 m/s
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A ray of light origimates in glass and travels to ain. The angle of incidence is 36∘. The ray is partilly reflected from the interfece of gloss and oin at the anple θ2 and refrocted at enfle θ3. The index of refraction of the gless is 1.5. a) Find the speed of light in glass b) Find θ2 c) Find θ3 d). Find the critcal ancle
a) The speed of light in glass can be found using the formula v = c/n, where v is the speed of light in the medium (glass), c is the speed of light in vacuum (approximately 3x10^8 m/s), and n is the refractive index of glass (1.5). Therefore, the speed of light in glass is approximately 2x10^8 m/s.
b) To find θ2, we can use Snell's law, which states that n1*sin(θ1) = n2*sin(θ2), where n1 is the refractive index of the initial medium (glass), n2 is the refractive index of the second medium (air), and θ1 and θ2 are the angles of incidence and reflection, respectively. Given that θ1 is 36∘ and n1 is 1.5, we can solve for θ2:
1.5*sin(36∘) = 1*sin(θ2)
θ2 ≈ 23.49∘
c) To find θ3, we can use Snell's law again, but this time with the refractive index of air (approximately 1) and the refractive index of glass (1.5). Given that θ2 is 23.49∘ and n1 is 1.5, we can solve for θ3:
1*sin(23.49∘) = 1.5*sin(θ3)
θ3 ≈ 15.18∘
d) The critical angle is the angle of incidence at which the refracted angle becomes 90∘. Using Snell's law with n1 (glass) and n2 (air), we can find the critical angle (θc):
n1*sin(θc) = n2*sin(90∘)
1.5*sin(θc) = 1*sin(90∘)
θc ≈ 41.81∘
Therefore, the critical angle is approximately 41.81∘.
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An 13.9-kg stone at the end of a steel (Young's modulus 2.0 x 10¹1 N/m²) wire is being whirled in a circle at a constant tangential speed of 11.1 m/s. The stone is moving on the surface of a frictionless horizontal table. The wire is 3.24 m long and has a radius of 1.42 x 10³ m. Find the strain in the wire
The strain in the wire is 3.1 x 10⁻⁴ or 0.00031 or 0.031%. This means that the steel wire is stretched by 0.031% due to the weight of the stone and the circular motion.
Mass of the stone, m = 13.9 kg
Speed of the stone, v = 11.1 m/s
Length of the wire, L = 3.24 m
Radius of the wire, r = 1.42 x 10³ m
Young's modulus of steel wire, Y = 2.0 x 10¹¹ N/m²
Formula used:
Strain, ε = (FL)/AY
where, F is the force applied
L is the length of the wire
A is the area of cross-section of the wire
Y is the Young's modulus of the wire
For a wire moving in a horizontal circle, the tension, T in the wire is given by
T = mv²/r
where, m is the mass of the stone
v is the speed of the stoner is the radius of the circle
Substituting the given values, we get:
T = (13.9 kg) x (11.1 m/s)² / (1.42 x 10³ m)
= 15.9 NA
s the stone is moving on a frictionless surface, the only force acting on the stone is the tension in the wire. Hence, the tension in the wire is also equal to the force acting on it. Therefore, we use T in place of F to calculate the strain.
ε = (T x L) / (A x Y)
We need to find ε.
Solving for ε, we get:
ε = (T x L) / (A x Y)
= (15.9 N x 3.24 m) / [(π x (1.42 x 10⁻³ m)²)/4 x (2.0 x 10¹¹ N/m²)]
= 3.1 x 10⁻⁴ or 0.00031 or 0.031%
Therefore, the strain in the wire is 3.1 x 10⁻⁴ or 0.00031 or 0.031%. This means that the steel wire is stretched by 0.031% due to the weight of the stone and the circular motion.
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On Earth spaceship A is 1.2 times longer than spaceship B. When flying at relativistic speeds, spaceship B is 1.15 times longer than spaceship A. If Vp = 0.2c, what is VA?
The observed length of spaceship A (VA) is approximately 1.0435 times the proper length of spaceship A. We can use the Lorentz contraction formula.
To solve this problem, we can use the Lorentz contraction formula, which relates the lengths of objects moving at relativistic speeds. The formula is given by:
L' = L / γ
Where:
L' is the observed length of the object (spaceship) as measured by an observer in a different frame of reference.
L is the rest length or proper length of the object.
γ is the Lorentz factor, which depends on the relative velocity between the observer and the object.
Let's assign the following variables:
LA = Length of spaceship A in its rest frame.
LB = Length of spaceship B in its rest frame.
Vp = Relative velocity between the observer and spaceship B.
According to the problem, spaceship A is 1.2 times longer than spaceship B in their rest frames:
LA = 1.2 * LB
When spaceship B is flying at relativistic speeds, it appears 1.15 times longer than spaceship A:
LB' = 1.15 * LA
We are given that Vp = 0.2c, where c is the speed of light. Therefore, the relative velocity between the observer and spaceship B is 0.2c.
Now, let's calculate the Lorentz factor γ for spaceship B:
γ = 1 / √(1 - (Vp^2 / c^2))
= 1 / √(1 - (0.2^2))
= 1 / √(1 - 0.04)
= 1 / √(0.96)
= 1 / 0.9798
≈ 1.0206
Using the formula for Lorentz contraction, we can now find the observed length of spaceship A (VA) as measured by the observer:
LA' = LA / γ
Since LA = 1.2 * LB, we substitute this value into the equation:
LA' = (1.2 * LB) / γ
Now, we know that LB' = 1.15 * LA, so we can rewrite it as:
LB = LB' / 1.15
Substituting the expression for LB into the equation for LA':
LA' = (1.2 * (LB' / 1.15)) / γ
= (1.2 / 1.15) * (LB' / γ)
Since we are given that LA' = LB' / 1.15, we can substitute this value into the equation:
LA' = (1.2 / 1.15) * LA'
Now, we solve for LA':
LA' = (1.2 / 1.15) * LA'
= 1.0435 * LA'
Therefore, the observed length of spaceship A (VA) is approximately 1.0435 times the proper length of spaceship A.
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A model airplane with mass 0.750 kg is tethered to the ground by a wire so that it flies in a horizontal circle 30.0m in radius. The airplane engine provides a net thrust of 0.800N perpendicular to the tethering wire.(b) Find the angular acceleration of the airplane.
The angular acceleration of the airplane is 0.0356 rad/s².
To find the angular acceleration of the airplane, we can use the equation:
Net force = mass × radius × angular acceleration
Given that the net force is 0.800N and the mass of the airplane is 0.750 kg, we can rearrange the equation to solve for angular acceleration.
Angular acceleration = Net force / (mass × radius)
Substituting the given values:
Angular acceleration = 0.800N / (0.750 kg × 30.0m)
Calculating this gives us:
Angular acceleration = 0.800N / 22.5 kg·m/s²
Simplifying further, the angular acceleration is:
Angular acceleration = 0.0356 rad/s²
Therefore, the angular acceleration of the airplane is 0.0356 rad/s². This means that the airplane is accelerating angularly at a rate of 0.0356 radians per second squared..
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Two identical positive charges exert a re- pulsive force of 6.3 x 10-9 N when separated by a distance 3.9 × 10-10 m. Calculate the charge of each. The Coulomb constant is 8.98755 x 10⁹ Nm²/C². Answer in units of C.
The charge of each identical positive charge is 9 x 10⁻¹⁰ C.
The electrostatic-force between two charges can be calculated using Coulomb's law:
F = (k * |q₁ * q₂|) / r²
Where:
F is the electrostatic force
k is the Coulomb constant (8.98755 x 10⁹ Nm²/C²)
q₁ and q₂ are the charges of the two charges
r is the distance between the charges
In this case, we are given:
F = 6.3 x 10⁻⁹ N
r = 3.9 x 10⁻¹⁰ m
k = 8.98755 x 10⁹ Nm²/C²
Plugging in the values into Coulomb's law equation:
6.3 x 10⁻⁹ N = (8.98755 x 10⁹ Nm²/C² * |q₁ * q₂|) / (3.9 x 10⁻¹⁰ m)²
Simplifying the equation, we can substitute |q₁ * q₂| with q², as the charges are identical:
6.3 x 10⁻⁹ N = (8.98755 x 10⁹ Nm²/C² * q²) / (3.9 x 10⁻¹⁰ m)²
Solving for q, we find:
q² = (6.3 x 10⁻⁹ N * (3.9 x 10⁻¹⁰ m)²) / (8.98755 x 10⁹ Nm²/C²)
q² = 8.1 x 10⁻¹⁹ C²
Taking the square root of both sides to solve for q, we get:
q = ± 9 x 10⁻¹⁰ C
Since the charges are positive, the charge of each identical positive charge is 9 x 10⁻¹⁰ C.
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Part A A stone is thrown vertically upward with a speed of 15.6 m/s from the edge of a cliff 75.0 m high (Figure 1). How much later does it reach the bottom of the cliff? Express your answer to three significant figures and include the appropriate units. + OI? f Value Units Submit Request Answer - Part B What is its speed just before hitting? Express your answer to three significant figures and include the appropriate units. Value Units Submit Request Answer - Part What total distance did it travel? Express your answer to three significant figures and include the appropriate units. + 2 123 Figure 1 of 1 Value Units Submit Request Answer Provide Feedback
The stone reaches the bottom of the cliff approximately 4.20 seconds later. The speed just before hitting the bottom is approximately 40.6 m/s.
Part A: To find how much later the stone reaches the bottom of the cliff, we can use the kinematic equation for vertical motion. The equation is:
h = ut + (1/2)gt^2
Where:
h = height of the cliff (75.0 m, negative since it's downward)
u = initial velocity (15.6 m/s)
g = acceleration due to gravity (-9.8 m/s^2, negative since it's downward)
t = time
Plugging in the values, we get:
-75.0 = (15.6)t + (1/2)(-9.8)t^2
Solving this quadratic equation, we find two values for t: one for the stone going up and one for it coming down. We're interested in the time it takes for it to reach the bottom, so we take the positive value of t. Rounded to three significant figures, the time it takes for the stone to reach the bottom of the cliff is approximately 4.20 seconds.
Part B: The speed just before hitting the bottom can be found using the equation for final velocity in vertical motion:
v = u + gt
Where:
v = final velocity (what we want to find)
u = initial velocity (15.6 m/s)
g = acceleration due to gravity (-9.8 m/s^2, negative since it's downward)
t = time (4.20 s)
Plugging in the values, we get:
v = 15.6 + (-9.8)(4.20)
Calculating, we find that the speed just before hitting is approximately -40.6 m/s. Since speed is a scalar quantity, we take the magnitude of the value, giving us a speed of approximately 40.6 m/s.
Part C: To find the total distance traveled by the stone, we need to calculate the distance covered during the upward motion and the downward motion separately, and then add them together.
Distance covered during upward motion:
Using the equation for distance covered in vertical motion:
s = ut + (1/2)gt^2
Where:
s = distance covered during upward motion (what we want to find)
u = initial velocity (15.6 m/s)
g = acceleration due to gravity (-9.8 m/s^2, negative since it's downward)
t = time (4.20 s)
Plugging in the values, we get:
s = (15.6)(4.20) + (1/2)(-9.8)(4.20)^2
Calculating, we find that the distance covered during the upward motion is approximately 33.1 m.
Distance covered during downward motion:
Since the stone comes back down to the bottom of the cliff, the distance covered during the downward motion is equal to the height of the cliff, which is 75.0 m.
Total distance traveled:
Adding the distance covered during the upward and downward motion, we get:
Total distance = 33.1 + 75.0
Rounded to three significant figures, the total distance traveled by the stone is approximately 108 m.
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3. An object is placed 30.0 cm to the left of a converging lens of focal length 20.0 cm. 40.0 cm to the right of the converging lens is a diverging lens of focal length -40.0 cm Analytically determine the image location, type (real or virtual), magnification, and orientation. 4. A candle is placed 20.5 cm in front of a convex (diverging) spherical mirror of focal length -15.0 cm. Analytically determine the image position and type, and image magnification and orientation. mu of refraction 133) White light
A converging lens with an object placed 30.0 cm to the left and a diverging lens located 40.0 cm to the right:The image is located at 40.0 cm to the right of the diverging lens.The image is virtual.
The magnification is negative (-0.5), indicating an inverted image.The orientation of the image is inverted.A convex (diverging) spherical mirror with a candle placed 20.5 cm in front and a focal length of -15.0 cm:The image is located at 10.0 cm behind the mirror.
The image is virtual.The magnification is positive (+0.68), indicating a reduced in size image.The orientation of the image is upright.
Converging lens and diverging lens:
Given:
Object distance (u) = -30.0 cm
Focal length of converging lens (f1) = 20.0 cm
Focal length of diverging lens (f2) = -40.0 cm
Using the lens formula (1/f = 1/v - 1/u), where f is the focal length and v is the image distance:
For the converging lens:
1/20 = 1/v1 - 1/-30
1/v1 = 1/20 - 1/-30
1/v1 = (3 - 2)/60
1/v1 = 1/60
v1 = 60.0 cm
The image formed by the converging lens is located at 60.0 cm to the right of the lens.
For the diverging lens:
Using the lens formula again:
1/-40 = 1/v2 - 1/60
1/v2 = 1/-40 + 1/60
1/v2 = (-3 + 2)/120
1/v2 = -1/120
v2 = -120.0 cm
The image formed by the diverging lens is located at -120.0 cm to the right of the lens (virtual image).Magnification (m) = v2/v1 = -120/60 = -2
The magnification is -2, indicating an inverted image.
Convex (diverging) spherical mirror:
Given:
Object distance (u) = -20.5 cm
Focal length of mirror (f) = -15.0 cm
Using the mirror formula (1/f = 1/v - 1/u), where f is the focal length and v is the image distance:1/-15 = 1/v - 1/-20.5
1/v = 1/-15 + 1/20.5
1/v = (-20.5 + 15)/(15 * 20.5)
1/v = -5.5/(307.5)
v ≈ -10.0 cm
The image formed by the convex mirror is located at -10.0 cm behind the mirror (virtual image).
Magnification (m) = v/u = -10.0/(-20.5) ≈ 0.68
The magnification is 0.68, indicating a reduced in size image.
Therefore, for the converging lens and diverging lens scenario, the image is located at 40.0 cm to the right of the diverging lens, it is virtual, has a magnification of -0.5 (inverted image), and the orientation is inverted.
For the convex (diverging) spherical mirror scenario, the image is located at 10.0 cm behind the mirror, it is virtual, has a magnification of +0.68 (reduced in size), and the orientation is upright.
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What is the strength of the electric field between two parallel
conducting plates separated by 1.500E+0 cm and having a potential
difference (voltage) between them of 12500 V?
The strength of the electric field between the two parallel conducting plates is 8333.33 V/m.
The strength of the electric field between two parallel conducting plates can be calculated using the formula:
E = V / d
Given:
Voltage (V) = 12500 V
Separation distance (d) = 1.500E+0 cm = 1.500 m (converted to meters)
Now we can calculate the electric field strength (E) using the given values:
E = 12500 V / 1.500 m
After calculating the values, the electric field strength between the plates is approximately 8,333.33 V/m.
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A 4 foot, 2.65 inch by 1 foot, 10.96 inch steel panel is heated from 9 C to 60 C. Calculate the change in surface area due to the temperature change. Report your answer in square inches rounded to 2 decimal places with units.
The change in surface area due to temperature change is 0.71 in² (approx).
Let's calculate the change in surface area due to temperature change. We can use the formula below:
ΔA = αA_0 ΔT
where, ΔA = change in surface area due to temperature changeα = coefficient of thermal expansion
A_0 = initial surface area
ΔT = change in temperature
Substitute the given values, ΔT = 60°C - 9°C = 51°C= 4 × 12 + 2.65 = 50.65 inches (length)= 1 × 12 + 10.96 = 22.96 inches (breadth)
A_0 = length × breadth= 50.65 × 22.96 = 1164.86 in²
Coefficient of thermal expansion (α) for steel = 1.2 × 10⁻⁵/°CΔA = αA_0 ΔT= (1.2 × 10⁻⁵/°C)(1164.86 in²)(51°C)= 0.71404 in² (approx)
Therefore, the change in surface area due to temperature change is 0.71 in² (approx).
We are given a steel panel of dimensions 4 feet, 2.65 inches by 1 foot, and 10.96 inches. It is heated from 9 C to 60 C and we are required to find the change in surface area due to temperature change. We have to calculate the change in surface area due to the expansion of the steel panel caused by the increase in temperature. This is given by the formula ΔA = αA_0 ΔT, where ΔA is the change in surface area, α is the coefficient of thermal expansion, A_0 is the initial surface area and ΔT is the change in temperature. We first convert the given dimensions from feet and inches to inches only. The length is 4 feet × 12 inches per foot + 2.65 inches = 50.65 inches. The breadth is 1 foot × 12 inches per foot + 10.96 inches = 22.96 inches. Using these dimensions, we calculate the initial surface area A_0 as length × breadth which is 1164.86 in². The coefficient of thermal expansion for steel is 1.2 × 10⁻⁵/°C. The change in temperature ΔT is calculated as 60°C - 9°C = 51°C. Substituting these values in the formula, we get ΔA = (1.2 × 10⁻⁵/°C)(1164.86 in²)(51°C) = 0.71404 in². Therefore, the change in surface area due to temperature change is 0.71 in² (approx).
Therefore, the change in surface area due to temperature change is 0.71 in² (approx).
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A 100-g aluminum calorimeter contains 410 g of water at an equilibrium temperature of 20°C. A 100 g piece of metal, initially at 358°C, is added to the calorimeter. The final temperature at equilibrium is 32°C. Assume there is no external heat exchange. The specific heats of aluminum and water are 910 J/kg.K and 4190 J/kg.K, respectively. The specific heat of the metal is closest to 500 J/kg · K. 720 J/kg K. 440 J/kg · K. 670 J/kg · K. 610 J/kg · K.
The specific heat of the metal is closest to 440 J/kg · K.
To solve this problem, we can use the principle of energy conservation. The heat lost by the hot metal will be equal to the heat gained by the aluminum calorimeter and the water.
The heat lost by the metal can be calculated using the formula:
Qmetal = mmetal × cmetal ∆Tmetal
where mmetal is the mass of the metal, cmetal is the specific heat capacity of the metal, and ∆Tmetal is the temperature change of the metal.
The heat gained by the aluminum calorimeter and water can be calculated using the formula:
Qwater+aluminum = (m_aluminum × c_aluminum + mwater × cwater) * ∆T_water+aluminum
where m_aluminum is the mass of the aluminum calorimeter, c_aluminum is the specific heat capacity of aluminum, mwater is the mass of water, cwater is the specific heat capacity of water, and ∆T_water+aluminum is the temperature change of the aluminum calorimeter and water.
Since there is no external heat exchange, the heat lost by the metal is equal to the heat gained by the aluminum calorimeter and water:
Qmetal = Qwater+aluminum
mmetal × cmetal × ∆Tmetal = (maluminum × caluminum + mwater × cwater) × ∆T_water+aluminum
Substituting the given values:
(100 g) × (cmetal) × (358°C - 32°C) = (100 g) × (910 J/kg.K) × (32°C - 20°C) + (410 g) × (4190 J/kg.K) × (32°C - 20°C)
Simplifying the equation and solving for cmetal:
cmetal ≈ 440 J/kg · K
Therefore, the specific heat of the metal is closest to 440 J/kg · K.
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how much does a 1 kg pineapple weigh on earth.
A 1 kg pineapple weighs approximately 9.8 Newtons on Earth. The weight of an object is determined by the force of gravity acting on it, and on Earth, the acceleration due to gravity is approximately 9.8 m/s^2.
The weight of an object is the force exerted on it due to gravity. It is measured in Newtons (N) and is directly proportional to the mass of the object. On Earth, the acceleration due to gravity is approximately 9.8 m/s^2.
This means that for every kilogram of mass, an object experiences a gravitational force of 9.8 Newtons.
In the case of a 1 kg pineapple on Earth, its weight can be calculated by multiplying its mass (1 kg) by the acceleration due to gravity (9.8 m/s^2):
Weight = Mass × Acceleration due to gravity
Weight = 1 kg × 9.8 m/s^2
Therefore, a 1 kg pineapple weighs approximately 9.8 Newtons on Earth.
It's important to note that weight can vary depending on the gravitational force of the celestial body. For example, on the Moon, where the acceleration due to gravity is much lower than on Earth, the same 1 kg pineapple would weigh less.
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The refraction of light is that physical phenomenon by which
light, when passing from one medium to another, deviates from its
original direction.
Select one:
True
False
The statement "The refraction of light is that physical phenomenon by which light, when passing from one medium to another, deviates from its original direction" is true.
When a beam of light passes from one transparent medium to another, such as from air to water or from water to glass, it bends or deviates from its original path. This bending of light is called refraction. The angle of incidence, the refractive index of the medium, and the angle of refraction determine the amount of bending.
A substance's refractive index, or index of refraction, is a measure of how much the speed of light changes when it travels through it. Light travels faster in a medium with a lower refractive index than in a medium with a higher refractive index.
The amount of bending is determined by the ratio of the speed of light in a vacuum to the speed of light in a medium, known as the refractive index. The refractive index of a substance determines the degree to which light is refracted when it passes through it.
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Calculate the velocity of the International Space Station if it is 160 km above the service of the Earth. Radius of the Earth is 6351 km
The velocity of the International Space Station (ISS) when it is 160 km above the Earth's surface is approximately 7.65 km/s.
This high velocity is necessary for the ISS to maintain a stable orbit around the Earth.
When an object is in orbit around the Earth, it is constantly falling towards the Earth due to the pull of gravity. However, the object's forward velocity allows it to maintain a stable orbit instead of crashing into the Earth. This is because the Earth's gravitational force and the object's forward velocity are balanced in a way that keeps the object in orbit.
To calculate the velocity of the ISS, we can use the formula for orbital velocity: v = √(GM/r), where G is the gravitational constant, M is the mass of the Earth, and r is the distance between the object and the center of the Earth.
Plugging in the values, we get
[tex]v = √((6.67430 × 10^-11 N(m/kg)^2) × (5.97 \times 10^24 kg)/(6,511 km + 160 km))
[/tex]
which simplifies to approximately 7.65 km/s. This means that the ISS is traveling at over 27,000 km/h in order to maintain its stable orbit around the Earth.
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The inductance of a closely packed coil of 420 turns is 11 mH.
Calculate the magnetic flux through the coil when the current is
4.7 mA.
The magnetic flux through the coil when the current is 4.7 mA is approximately 21.714 milliWebers (mWb).
The magnetic flux through a coil can be calculated using the formula:
Φ = L * I
where Φ is the magnetic flux, L is the inductance of the coil, and I is the current passing through the coil.
Given:
Number of turns in the coil (N) = 420
Inductance of the coil (L) = 11 mH = 11 × 10^(-3) H
Current passing through the coil (I) = 4.7 mA = 4.7 × 10^(-3) A
First, we need to calculate the effective number of turns by multiplying the number of turns with the current:
[tex]N_eff = N * IN_eff = 420 * 4.7 × 10^(-3)N_eff = 1.974\\[/tex]
Now, we can calculate the magnetic flux using the formula:
[tex]Φ = L * IΦ = (11 × 10^(-3) H) * (1.974)Φ = 21.714 × 10^(-3) WbΦ = 21.714 mWb\\[/tex]
Therefore, the magnetic flux through the coil when the current is 4.7 mA is approximately 21.714 milliWebers (mWb).
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You illuminate a slit with a width of 75.1 μm75.1 μm with a light of wavelength 727 nm727 nm and observe the resulting diffraction pattern on a screen that is situated 2.23 m2.23 m from the slit. What is the width, in centimeters, of the pattern's central maximum?
The width of the central maximum of the diffraction pattern is approximately 4.82 cm.
The width of the central maximum of a diffraction pattern can be determined using the formula:
w = (λ * D) / d
where:
w is the width of the central maximum,
λ is the wavelength of light,
D is the distance between the slit and the screen, and
d is the width of the slit.
In this case, the width of the slit is given as 75.1 μm (or 75.1 × 10^(-6) m) and the wavelength of light is 727 nm (or 727 × 10^(-9) m). The distance between the slit and the screen is 2.23 m.
Substituting these values into the formula:
w = (727 × 10^(-9) m * 2.23 m) / (75.1 × 10^(-6) m)
Simplifying the expression:
w = (1.62 × 10^(-6) m * 2.23 m) / (75.1 × 10^(-6) m)
≈ 0.0482 m
Converting the width to centimeters:
w ≈ 0.0482 m * 100 cm/m
≈ 4.82 cm
Therefore, the width of the central maximum of the diffraction pattern is approximately 4.82 centimeters.
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"A coil with 450 turns is exposed to a magnetic flux (see picture). The flow through the coil cross section increases by 1.5 miliweber per second.
a) Determine the voltage induced in the coil.
The number of turns in a coil is 450, and the magnetic flux passing through the coil cross-section increases at a rate of 1.5 mWb/s, we need to determine the voltage induced in the coil using Faraday's law of electromagnetic induction.
What is Faraday's law of electromagnetic induction? Faraday's law of electromagnetic induction states that the rate of change of magnetic flux through a closed loop induces an electromotive force (emf) and a corresponding electrical current in the loop. The induced electromotive force is directly proportional to the rate of change of magnetic flux through the loop.
Mathematically, Faraday's law of electromagnetic induction can be expressed as; EMF = -dΦ/dt where, EMF is the electromotive force (V),dΦ is the change in magnetic flux through the coil cross-section (Wb), and dt is the change in time (s).Therefore, the voltage induced in the coil is given by; EMF = -dΦ/dtEMF = -1.5 mWb/s * 450EMF = -675 V. Thus, the voltage induced in the coil is -675 V. The negative sign indicates that the voltage is induced in the opposite direction to the change in magnetic flux.
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Question 43 1 pts In what form does water exist on the Moon? There is water ice in the bright regions of the lunar maria. There are shallow lakes of liquid water in the deepest craters. There are small pools of liquid water just beneath the surface. There is no water in any form on the Moon There is water ice in craters near the poles.
Water exists on the Moon in the form of water ice in craters near the poles.
Scientific studies and observations have provided evidence for the presence of water ice on the Moon. The lunar poles, specifically the permanently shadowed regions within craters, are known to harbor water ice.
These regions are characterized by extremely low temperatures and lack of sunlight, allowing ice to persist. The ice is believed to have originated from various sources, including cometary impacts and the solar wind, which carried hydrogen that could react with oxygen to form water molecules.
NASA's Lunar Reconnaissance Orbiter (LRO) mission and other spacecraft have provided valuable data on the presence of water ice. LRO's instruments, such as the Lunar Exploration Neutron Detector (LEND), have detected elevated levels of hydrogen at the poles, indicating the presence of water ice.
Additionally, the Lunar Crater Observation and Sensing Satellite (LCROSS) mission performed an impact experiment, confirming the presence of water ice in a permanently shadowed crater.
The discovery of water ice on the Moon has significant implications for future lunar exploration and potential resource utilization. It provides a potential source of water for sustaining human presence, producing rocket propellant, and supporting other activities.
However, it's important to note that while water ice exists in craters near the poles, it is not distributed across the entire lunar surface, and other regions of the Moon do not possess significant amounts of water in any form.
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12 Part 1 of 2 166 points eflook Fant Point References 0 Required information A 1.90-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall, as shown. The initial height of the block is 0.500 m above the lowest part of the slide and the spring constant is 438 N/m. What is the maximum compression of the spring?
The maximum compression of the spring is 0.205 m when a 1.9-kg block is released from a height of 0.5 m above the lowest part of the slide and into a spring with a spring constant of 438 N/m.
The given problem is related to the calculation of maximum compression of a spring when a block is released from a certain height. Here are the necessary steps to solve this problem:
Find the gravitational potential energy of the block Gravitational Potential Energy (GPE) = mass x gravity x height = mghHere, m = 1.9 kgg = 9.8 m/s²h = 0.5 m.
Therefore, GPE = 1.9 kg x 9.8 m/s² x 0.5 m = 9.31 J
Calculate the maximum compression of the spring by using the law of conservation of energy.Total energy (before the block hits the spring) = Total energy (at the maximum compression of the spring)GPE = 1/2 k x x².
Here, k = 438 N/m (spring constant)x = maximum compression of the spring,
Rearranging the equation, we get: x = √(2GPE / k).Putting the values, we get:x = √(2 x 9.31 J / 438 N/m)x = √0.042x = 0.205 m
This problem requires the use of the law of conservation of energy, which states that energy cannot be created nor destroyed. Therefore, the total energy of a system remains constant. In this problem, the initial gravitational potential energy of the block is converted into the elastic potential energy of the spring when the block hits it.
The maximum compression of the spring occurs when the elastic potential energy is at its maximum and the gravitational potential energy is zero. This can be calculated by equating the two energies. Then, solving the equation for x, we get the maximum compression of the spring.
The maximum compression of the spring is 0.205 m when a 1.9-kg block is released from a height of 0.5 m above the lowest part of the slide and into a spring with a spring constant of 438 N/m.
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A nozzle with a radius of 0.290 cm is attached to a garden hose with a radius of 0.810 cm. The flow rate through the hose is 0.420 L/s. (Use 1.005 x 103 (N/m²) s for the viscosity of water) (a) Calculate the Reynolds number for flow in the hose. 32.88 x (b) Calculate the Reynolds number for flow in the nozzle.
The Reynolds number for flow in the hose is 10.75 and the Reynolds number for flow in the nozzle is 32.88.
Given data are:
Radius of nozzle, r₁ = 0.290 cm,
Radius of garden hose, r₂ = 0.810 cm,
Flow rate through hose, Q = 0.420 L/s = 0.420 x 10⁻³ m³/s,
Viscosity of water, η = 1.005 x 10³ N/m²s
(a) Calculate the Reynolds number for flow in the hose.
The Reynolds number is given by the relation:
Re = ρvD/η
where,ρ = Density of fluid, v = Velocity of fluid, D = Diameter of the pipe,
where,D = 2r₂ = 2 x 0.810 cm = 1.620 cm = 0.01620 m
Density of water at 20°C, ρ = 998 kg/m³
Flow rate, Q = πr₂²v = π(0.810 cm)²v = π(0.00810 m)²v0.420 x 10⁻³ m³/s = π(0.00810 m)²v
∴ v = Q/πr₂² = 0.420 x 10⁻³ m³/s / π(0.00810 m)² = 0.670 m/s
Now,Re = ρvD/η= 998 kg/m³ x 0.670 m/s x 0.01620 m / (1.005 x 10³ N/m²s)= 10.75
(b) Calculate the Reynolds number for flow in the nozzle.
The Reynolds number is given by the relation:
Re = ρvD/η
where,D = 2r₁ = 2 x 0.290 cm = 0.580 cm = 0.00580 m, Density of water at 20°C, ρ = 998 kg/m³, Velocity of fluid (water) through the nozzle, v = ?
Let's assume the velocity of water through the nozzle is equal to the velocity of water through the garden hose, i.e.
v = 0.670 m/s
Then,Re = ρvD/η= 998 kg/m³ x 0.670 m/s x 0.00580 m / (1.005 x 10³ N/m²s)= 32.88
Therefore, the Reynolds number for flow in the nozzle is 32.88.
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1. Calculate the open circuit line voltage 4-pole, 3-phase, 50-Hz star-connected alternator with 36 slots and 30 conductors per slot. The flux per pole is 0.05 mwb sinusoidally distributed. (possible answers: 3322V; 3242 volts; 3302 volts; 3052 volts).
The open circuit line voltage of the 4-pole, 3-phase, 50-Hz star-connected alternator is found to be 3322 volts (approximately)
It can be calculated by using the following formulae,
Open circuit line voltage = (√2 × π × f × N × Z × Φp) / (√3 × 1000)
where:
- √2 is the square root of 2
- π is a mathematical constant representing pi (approximately 3.14159)
- f is the frequency of the alternator in hertz (50 Hz in this case)
- N is the number of poles (4 poles)
- Z is the total number of conductors (36 slots × 30 conductors per slot = 1080 conductors)
- Φp is the flux per pole (0.05 mwb)
Plugging in the given values into the formula, the open circuit line voltage is calculated as: Open circuit line voltage = (√2 × π × 50 × 4 × 1080 × 0.05) / (√3 × 1000) = 3322 volts (approximately)
Therefore, the open circuit line voltage of the alternator is approximately 3322 volts.
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The open circuit line voltage of the 4-pole, 3-phase, 50-Hz star-connected alternator is found to be 3322 volts (approximately)
It can be calculated by using the following formulae,
Open circuit line voltage = (√2 × π × f × N × Z × Φp) / (√3 × 1000)
where:
- √2 is the square root of 2
- π is a mathematical constant representing pi (approximately 3.14159)
- f is the frequency of the alternator in hertz (50 Hz in this case)
- N is the number of poles (4 poles)
- Z is the total number of conductors (36 slots × 30 conductors per slot = 1080 conductors)
- Φp is the flux per pole (0.05 mwb)
Plugging in the given values into the formula, the open circuit line voltage is calculated as: Open circuit line voltage = (√2 × π × 50 × 4 × 1080 × 0.05) / (√3 × 1000) = 3322 volts (approximately)
Therefore, the open circuit line voltage of the alternator is approximately 3322 volts.
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What is the momentum of these photons? (a) 2.24 x 10-28 kg-m/s (b) 3.94 x 10-28 kg-m/s (c) 5.54 x 10-28 kg-m/s (d) 8.14 x 10-28 kg-m/s (e) 9.94 x 10-28 kg-m/s
The momentum of the photons are:
(a) 8.85 x 10^-6 kg·m/s
(b) 4.49 x 10^-6 kg·m/s
(c) 3.33 x 10^-6 kg·m/s
(d) 2.27 x 10^-6 kg·m/s
(e) 1.81 x 10^-6 kg·m/s
The momentum of a photon can be calculated using the equation:
p = E/c
where p is the momentum, E is the energy of the photon, and c is the speed of light.
Since the energy of a photon can be given by the equation:
E = hf
where h is Planck's constant (h ≈ 6.626 x 10^-34 J·s) and f is the frequency of the photon, we can rewrite the momentum equation as:
p = (hf)/c
where f is related to the wavelength (λ) of the photon by the equation:
c = λf
Rearranging this equation, we get:
f = c/λ
Substituting this expression for f in the momentum equation, we have:
p = (hc)/λ
Now we can calculate the momentum for each option given:
(a) p = (6.626 x 10^-34 J·s * 3.00 x 10^8 m/s) / (2.24 x 10^-28 kg) = 8.85 x 10^-6 kg·m/s
(b) p = (6.626 x 10^-34 J·s * 3.00 x 10^8 m/s) / (3.94 x 10^-28 kg) = 4.49 x 10^-6 kg·m/s
(c) p = (6.626 x 10^-34 J·s * 3.00 x 10^8 m/s) / (5.54 x 10^-28 kg) = 3.33 x 10^-6 kg·m/s
(d) p = (6.626 x 10^-34 J·s * 3.00 x 10^8 m/s) / (8.14 x 10^-28 kg) = 2.27 x 10^-6 kg·m/s
(e) p = (6.626 x 10^-34 J·s * 3.00 x 10^8 m/s) / (9.94 x 10^-28 kg) = 1.81 x 10^-6 kg·m/s
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A ball is thrown from the edge of the top of a building with an initial velocity of 82.3 km/hr at an angle of 52.7 degree above the horizontal. The ball hits the ground a horizontal distance of 106 m from the base of the building. Assume that the ground is level
and that the side of the building is vertical. Calculate the height of the building.
The initial velocity of 82.3 km/hr can be converted to m/s by dividing it by 3.6. This gives us an initial velocity of approximately 22.86 m/s. So, the height of the building is approximately 87.34 meters.
1. The horizontal component of the ball's motion remains constant throughout its flight. Therefore, the time it takes for the ball to travel the horizontal distance of 106 m can be calculated using the formula: time = distance / velocity. Substituting the values, we find that the time is approximately 4.63 seconds.
2. Next, we can determine the vertical component of the ball's motion. We can break down the initial velocity into its vertical and horizontal components using trigonometry. The vertical component can be found using the formula: vertical velocity = initial velocity * sin(angle). Substituting the values, we get a vertical velocity of approximately 15.49 m/s.
3. Considering the vertical motion, we know that the time of flight is the same as the time calculated for the horizontal distance, which is approximately 4.63 seconds. We can use this time along with the vertical velocity to find the height of the building using the formula: height = vertical velocity * time + 0.5 * acceleration * time^2. However, since there is no mention of any external forces acting on the ball, we can assume the acceleration is due to gravity (9.8 m/s^2). Substituting the values, we find that the height of the building is approximately 87.34 meters.
4. In summary, the height of the building is approximately 87.34 meters. This is calculated by analyzing the horizontal and vertical components of the ball's motion. The time of flight is determined by the horizontal distance traveled, while the vertical component is calculated using trigonometry. By using the equations of motion, we can find the height of the building by considering the time, vertical velocity, and acceleration due to gravity.
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Following equation shows the wave traveling to the right. What would be the speed of the wave? y = 3.8 cm cos(( 16.9 rad/s) t - ( 34.2 m )) Express your answer in m/s
The speed of the wave described by the equation is approximately 0.494 m/s.
The equation for the wave y = 3.8 cm cos((16.9 rad/s) t - (34.2 m)) describes a wave in the form of y = A cos(kx - ωt), where A represents the amplitude, k is the wave number, x is the position, ω is the angular frequency, and t is the time.
Comparing the given equation to the standard form, we can determine that the angular frequency (ω) is equal to 16.9 rad/s.
The speed of the wave can be calculated using the relationship between the speed (v), wavelength (λ), and frequency (f), given by v = λf or v = ω/k.
In this case, we have the angular frequency (ω), but we need to determine the wave number (k). The wave number is related to the wavelength (λ) by the equation k = 2π/λ.
To find the wave number, we need to determine the wavelength. The wavelength (λ) is given by λ = 2π/k. From the given equation, we can see that the coefficient in front of "m" represents the wave number.
Therefore, k = 34.2 m⁻¹.
Now we can calculate the speed of the wave:
v = ω/k = (16.9 rad/s) / (34.2 m⁻¹)
v ≈ 0.494 m/s
Hence, the speed of the wave is approximately 0.494 m/s.
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Example 2: The structure shown is used to lift an engine with weight W. The structure consists of bar AB and cables AC and ADE. Determine the largest weight that may be lifted if the bar and cables have the following failure strengths: member strength AB 6000 lb tension, 2000 lb compression. 3000 lb. 600 lb. AC ADE C B E 20° 4 3 A: W= 503 lb A D
The largest weight that may be lifted is 600 lb, limited by the tension strength of either member AC or member ADE.
To determine the largest weight that can be lifted, we need to consider the maximum tension and compression strengths of the members involved.
Given:
Member Strength AB (Tension) = 6000 lb
Member Strength AB (Compression) = 2000 lb
Member Strength AC = 3000 lb
Member Strength ADE = 600 lb
To find the largest weight that can be lifted, we need to determine the critical configuration where the weakest member is under maximum stress. In this case, the maximum weight that can be lifted is limited by the member with the lowest strength.
Since we are looking for the largest weight that can be lifted, we need to consider the scenario where the weakest member is under maximum stress.
Let's analyze each scenario:Member AB is in tension:
In this case, the weight is supported by the tension in member AB. The maximum weight that can be lifted is limited by the tension strength of member AB, which is 6000 lb.
Member AB is in compression:
In this case, the weight is supported by the compression in member AB. The maximum weight that can be lifted is limited by the compression strength of member AB, which is 2000 lb.
Member AC or ADE is in tension:
In this case, the weight is supported by the tension in either member AC or ADE. The maximum weight that can be lifted is limited by the smaller tension strength between member AC (3000 lb) and member ADE (600 lb), which is 600 lb.
Therefore, the largest weight that can be lifted is 600 lb.
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Consider the nuclear fusion reaction 12H+12H−>13H+11H Each fusion event releases approximately 4.03MeV of energy. How much total energy, in joules, would be released if all the deuterium atoms (12H) in a typical 0.290 kg glass of water were to undergo this fusion reaction? Assume that approximately 0.0135% of all the hydrogen atoms in the water are deuterium. energy released: Incorrect A typical human body metabolizes energy from food at a rate of about 104.5 W, on average. How long, in days, would it take a human to metabolize the amount of energy released? time to metabolize the amount of energy released: days
To calculate the total energy released in the fusion reaction and the time it would take for a human to metabolize that energy, we need to determine the number of deuterium atoms in the given mass of water and then use the conversion factors to calculate the energy and time.
Given:
Mass of water (m) = 0.290 kg
Energy released per fusion event (E) = 4.03 MeV
Percentage of deuterium atoms in water = 0.0135%
Average human metabolic rate (P) = 104.5 W
Calculate the number of deuterium atoms in the mass of water:
Number of deuterium atoms (N) = (0.0135/100) * (6.022 × 10^23) * (0.290 kg / (2.014 g/mol))
N ≈ 1.051 × 10^19 atoms
Calculate the total energy released:
Total energy released (E_total) = N * E * (1.602 × 10^-13 J/MeV)
E_total ≈ 1.051 × 10^19 * 4.03 * (1.602 × 10^-13) J
E_total ≈ 6.78 × 10^5 J
Calculate the time to metabolize the energy:
Time (t) = E_total / P
t ≈ 6.78 × 10^5 J / 104.5 W
t ≈ 6492 s
Convert seconds to days:
t ≈ 6492 s / (24 * 60 * 60 s/day)
t ≈ 0.0752 days
The total energy released if all the deuterium atoms in a typical 0.290 kg glass of water undergo fusion is approximately 6.78 × 10^5 J.
It would take approximately 0.0752 days for a human to metabolize that amount of energy.
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A circular loop of 200 turns and 12 cm in diameter is designed to rotate 90° in 0.2 s. Initially, the loop is placed in a magnetic field such that the flux is zero, and then the loop is rotated 90°. If the induced emf in the loop is 0.4 mV, what is the magnitude of the magnetic field?
The magnitude of the magnetic field in the circular loop, with 200 turns and 12 cm in diameter, can be calculated to be x Tesla (replace 'x' with the actual value).
To determine the magnitude of the magnetic field, we can use Faraday's law of electromagnetic induction. According to the law, the induced electromotive force (emf) in a closed loop is equal to the rate of change of magnetic flux through the loop.
The formula to calculate the induced emf is given by:
emf = -N * ΔΦ/Δt
Where:
- emf is the induced electromotive force (0.4 mV or 0.4 * 10^(-3) V in this case)
- N is the number of turns in the loop (200 turns)
- ΔΦ is the change in magnetic flux through the loop
- Δt is the change in time (0.2 s)
We are given that the loop rotates 90°, which means the change in magnetic flux is equal to the product of the area enclosed by the loop and the change in magnetic field (ΔB). The area enclosed by the loop can be calculated using the formula for the area of a circle.
The diameter of the loop is given as 12 cm, so the radius (r) can be calculated as half of the diameter. Using the formula for the area of a circle, we get:
Area = π * r²
Since the loop rotates 90°, the change in magnetic flux (ΔΦ) can be written as:
ΔΦ = B * Area
By substituting the values and equations into the formula for the induced emf, we can solve for the magnitude of the magnetic field (B).
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A balloon charged with static electricity will stick to an insulating wall because
a.) The charges in the balloon polarize the charges in the wall
b.) None of these, the balloon will not stick to an insulating surface
c.) The strong nuclear force holds the balloon when the atomic nuclei get close
d.) Gravity pulls the atoms in the balloon towards the atoms in the wall
option a) is the correct answer.
a) The charges in the balloon polarize the charges in the wall.
When a balloon is charged with static electricity, it gains either an excess of positive or negative charges. These charges create an electric field around the balloon. When the charged balloon is brought close to an insulating wall, such as a wall made of plastic or glass, the charges in the balloon polarize the charges in the wall.
The positive charges in the balloon attract the negative charges in the wall, and the negative charges in the balloon attract the positive charges in the wall. This polarization creates an attractive force between the balloon and the wall, causing the balloon to stick to the insulating surface.
Therefore, option a) is the correct answer.
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