The magnetic dipole moment of the wire loop is 22 A × (0.61 m × 0.61 m) = 8.86 Am².
The magnetic dipole moment of a wire loop is given by the product of the current, area of the loop and a unit vector perpendicular to the loop. Therefore the magnetic dipole moment of 0.61 m × 0.61 m square wire loop carrying 22.00 A of current is;
Magnetic dipole moment = I.A
So the magnetic dipole moment of the wire loop is 22 A × (0.61 m × 0.61 m) = 8.86 Am².
Let us define the two terms in this question;
Magnetic Dipole Moment
This is defined as the measure of the strength of a magnetic dipole. It is denoted by µ and the SI unit for measuring magnetic dipole moment is Ampere-m². It is given by the formula below;
µ = I.A
Current
This is the rate at which electric charge flows. It is measured in Amperes (A) and is represented by the letter “I”.
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Light is incident on the surface of metallic silver, from which 4.7eV are required to remove an electron. The stopping potential is 4.1 volts. (Note that 1eV=1.6×10 −19
J.) (a) Find the wavelength of the incident light. (b) Would this light emit any electrons from a metal whose work function is 7.5 eV? If so, determine the maximum kinetic energy of an emitted electron (in either J or eV ). If not, explain why. (c) If the power of the light source is 2.0 mW, how many photons are emitted by the source in 30 seconds
, and what is the momentum of each photon?
(a) The wavelength of the incident light is 2.65 × 10⁻⁷ m
(b) The incident light cannot emit any electrons from the metal because its energy is less than the work function of the metal.
(c) The total number of photons emitted by the source is 2.50 × 10⁻²⁷ kg m/s.
(a) Calculation of the wavelength of incident light:
For the incident light on metallic silver from which 4.7 eV is required to remove an electron, the frequency of the incident light (f) can be calculated as:
f = (4.7 eV)/(h) = (4.7 × 1.6 × 10⁻¹⁹ J)/(6.63 × 10⁻³⁴ J s) ≈ 1.13 × 10¹⁵Hz
where h is Planck's constant and 1 eV = 1.6 × 10⁻¹⁹ J.
The wavelength of the incident light is given by,λ = (c)/f = (3 × 10⁸ m/s)/(1.13 × 10¹⁵ Hz) ≈ 2.65 × 10⁻⁷ m
(b) Calculation of the maximum kinetic energy of an emitted electron:
The energy of a photon can be determined as E = hf. Therefore, the energy of a photon of the incident light is, E = hf = (6.63 × 10⁻³⁴ J s)(1.13 × 10¹⁵ Hz) ≈ 7.48 × 10⁻¹⁹ J
To remove an electron from a metal whose work function is 7.5 eV, a photon should have a minimum energy of 7.5 eV.
Hence, the incident light cannot emit any electrons from the metal because its energy is less than the work function of the metal.
(c) Calculation of the number of photons and momentum of each photon: Given, the power of the light source is 2.0 mW.
Therefore, the energy of the light source is, E = Pt = (2.0 × 10⁻³ W)(30 s) = 6.0 × 10⁻² J
The energy of each photon is 7.48 × 10⁻¹⁹ J.
Hence, the total number of photons emitted by the source can be calculated as,
N = (E)/(hf) = (6.0 × 10⁻² J)/ (7.48 × 10⁻¹⁹ J) ≈ 8.02 × 10¹⁶
The momentum of a photon can be calculated as,
P = h/λ = (6.63 × 10⁻³⁴ J s)/(2.65 × 10⁻⁷ m) ≈ 2.50 × 10⁻²⁷ kg m/s
Therefore, the momentum of each photon is 2.50 × 10⁻²⁷ kg m/s.
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A 1581.64 kg tank runs out of brakes when it achieves a speed of 34.83 mi/hr. What linear momentum will you be experiencing?
Remember to perform the necessary conversions before solving.
Express your answer WITHOUT DECIMALS.
A car starts from rest and accelerates with a constant acceleration of 2 m/s for 3 s. The car continues for 5 s at constant velocity. The driver then applied the brakes and the car stopped after it raveled 50 m (from the point when the brakes applied and the stopping point). Calculate the average velocity of the car for the entire trip.
The average velocity of the car for the entire trip is approximately -3.44 m/s. The negative sign indicates that the car's motion is in the opposite direction of its initial motion.
The average velocity of the car for the entire trip can be calculated by dividing the total displacement by the total time. The car accelerates for 3 s, travels at constant velocity for 5 s, and then decelerates to a stop over a distance of 50 m. By calculating the displacements and times for each segment of the trip, we can determine the average velocity.
First, let's calculate the displacement and time for each segment of the trip. During the acceleration phase, the car starts from rest and accelerates with a constant acceleration of 2 m/s² for 3 seconds. Using the kinematic equation, we can find the displacement during this phase: d1 = (1/2) * a * t² = (1/2) * 2 * (3²) = 9 m.
During the constant velocity phase, the car travels for 5 seconds at a constant velocity, so the displacement during this phase is d2 = v * t = 2 m/s * 5 s = 10 m.
Finally, during the deceleration phase, the car stops after traveling 50 m. The displacement during this phase is d3 = -50 m (negative because it is in the opposite direction of the car's initial motion).
Now, we can calculate the total displacement: total displacement = d1 + d2 + d3 = 9 m + 10 m - 50 m = -31 m.
The total time for the entire trip is 3 s (acceleration) + 5 s (constant velocity) + time to stop. Since the car stops after traveling 50 m, we can calculate the time to stop using the equation v² = u² + 2ad, where u is the initial velocity (2 m/s), a is the deceleration (assumed to be the same as the acceleration, -2 m/s²), and d is the displacement (-50 m). Solving for time, we find time to stop = (v - u) / a = (0 - 2) / -2 = 1 s. Therefore, the total time is 3 s + 5 s + 1 s = 9 s.
Finally, we can calculate the average velocity by dividing the total displacement by the total time: average velocity = total displacement / total time = -31 m / 9 s ≈ -3.44 m/s.
Therefore, the average velocity of the car for the entire trip is approximately -3.44 m/s. The negative sign indicates that the car's motion is in the opposite direction of its initial motion.
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A 25-m dianteter wheel accelerates uniformly about its center from 149rpm to 270rpm in 2.35. Determine the angular velocity (rad/s) of the wheel 50 s after it has started accelerating.
Given data: Diameter of the wheel (D) = 25 mInitial angular velocity (ω₁) = 149 rpmFinal angular velocity (ω₂) = 270 rpmTime taken (t) = 2.35 s.
Formula used:We know that acceleration of an object is given bya = (ω₂ - ω₁) / tThe angular velocity of an object is given byω = 2πn / 60where,n = number of rotations in 1 second.
Therefore, the angular velocity (ω) of the wheel can be calculated as:ω₁ = 2πn₁ / 60 => n₁ = ω₁ * 60 / 2πω₂ = 2πn₂ / 60 => n₂ = ω₂ * 60 / 2πa = (ω₂ - ω₁) / ta = (270 - 149) / 2.35a = 94.468 rad/s²Let the angular velocity of the wheel after 50 s be ω₃Number of rotations in 1 second = 1 / 60Total number of rotations after 50 s = 50 / 60 = 5 / 6s = ω₁t + (1/2)at²s = 149 * 2.35 + (1/2) * 94.468 * (2.35)²s = 451.50 m.
After 5 / 6 rotations, the distance covered by the wheel can be calculated as follows: Distance covered in 1 rotation = πD = 3.14 * 25 mDistance covered in 5 / 6 rotations = (5 / 6) * 3.14 * 25 m = 130.90 mThe time taken to cover this distance can be calculated as:t = s / vt = 130.90 / (25 * ω₃)t = 5.236 / ω₃Now, we can write the equation for angular velocity as:50 / 60 = ω₁ * 50 + (1/2) * 94.468 * (50)² + (1/2) * 94.468 * (5.236 / ω₃)² + ω₃ * (5.236 / ω₃)ω₃² - 10.472ω₃ + 143.245 = 0Using the quadratic formula, we get,ω₃ = [ 10.472 ± sqrt((10.472)² - 4(143.245)(1)) ] / 2ω₃ = [ 10.472 ± 42.348 ] / 2ω₃ = 26.410 rad/s (approx)Therefore, the angular velocity of the wheel 50 s after it has started accelerating is approximately 26.410 rad/s. Answer: 26.410
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A school bus is traveling at a speed of 0.2 cm/s. A school child on the bus launches a paper airplane, flying at 0.02 cm/s relative to the bus in the forward direction of the bus's motion. What is the speed of the paper airplane as seen by school children on the sidewalk through the bus windows? 0.248c 0.238c 0.219c 0.229c
The speed of the paper airplane as seen by school children on the sidewalk through the bus windows is approximately 0.229 times the speed of light (c).
To determine the speed of the paper airplane as seen by school children on the sidewalk through the bus windows, we need to consider the concept of relative velocities.
The velocity of an object can be calculated by adding or subtracting the velocities relative to different reference frames. In this case, the paper airplane's velocity is given relative to the bus, which is moving at a speed of 0.2 cm/s.
When the velocities are in the same direction, we can find the relative velocity by subtracting the magnitudes. Therefore, the relative velocity of the paper airplane with respect to the sidewalk is given by:
Relative velocity = Velocity of paper airplane - Velocity of bus
Relative velocity = 0.02 cm/s - 0.2 cm/s
Relative velocity = -0.18 cm/s
Since the relative velocity is negative, it means the paper airplane appears to move in the opposite direction of the bus's motion when observed by school children on the sidewalk through the bus windows.
To convert the relative velocity to a fraction of the speed of light (c), we divide the magnitude of the relative velocity by the speed of light:
Speed of paper airplane / Speed of light = |Relative velocity| / Speed of light
Speed of paper airplane / c = 0.18 cm/s / (2.998 x 10^10 cm/s)
Speed of paper airplane / c ≈ 0.229
Therefore, the speed of the paper airplane as seen by school children on the sidewalk through the bus windows is approximately 0.229 times the speed of light (c).
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A bismuth target is struck by electrons, and x-rays are emitted. (a) Estimate the M-to L-shell transitional energy for bismuth when an electron falls from the M shell to the L shell. __________ keV (b) Estimate the wavelength of the x-ray emitted when an electron falls from the M shell to the L shell. ___________ m
A bismuth target is struck by electrons, and x-rays are emitted. (a) The M-to L-shell transitional energy for bismuth when an electron falls from the M shell to the L shell 13.03152 keV. (b) Estimate the wavelength of the x-ray emitted when an electron falls from the M shell to the L shell 10.0422 picometers (pm).
(a) The transitional energy between the M and L shells in bismuth can be estimated using the Rydberg formula:
ΔE = 13.6 eV × (Z²₁² / n₁² - Z²₂² / n₂²)
where ΔE is the transitional energy, Z₁ and Z₂ are the atomic numbers of the initial and final shells, and n₁ and n₂ are the principal quantum numbers of the initial and final shells.
In bismuth, the M shell corresponds to n₁ = 3 and the L shell corresponds to n₂ = 2.
Substituting the values for Z₁ = 83 and Z₂ = 83, and n₁ = 3 and n₂ = 2 into the formula:
ΔE = 13.6 eV × (83² / 3² - 83² / 2²)
ΔE ≈ 13.6 eV × (6889 / 9 - 6889 / 4)
ΔE ≈ 13.6 eV × (765.44 - 1722.25)
ΔE ≈ 13.6 eV × (-956.81)
ΔE ≈ -13031.52 eV
Since the transitional energy represents the energy released, it should be a positive value. Therefore, we can take the absolute value:
ΔE ≈ 13031.52 eV
Converting to kiloelectronvolts (keV):
ΔE ≈ 13.03152 keV
Therefore, the estimated M-to-L shell transitional energy for bismuth is approximately 13.03152 keV.
(b) The wavelength of the x-ray emitted during the electron transition can be estimated using the equation:
λ = hc / ΔE
where λ is the wavelength, h is Planck's constant (6.626 × 10^(-34) J·s), c is the speed of light (3.00 × 10^8 m/s), and ΔE is the transitional energy in joules.
Converting the transitional energy from eV to joules:
ΔE = 13.03152 keV × (1.602 × 10^(-19) J/eV)
ΔE ≈ 20.87496 × 10^(-19) J
Substituting the values into the equation:
λ = (6.626 × 10^(-34) J·s × 3.00 × 10^8 m/s) / (20.87496 × 10^(-19) J)
λ ≈ 10.0422 × 10^(-12) m
Therefore, the estimated wavelength of the x-ray emitted when an electron falls from the M shell to the L shell in bismuth is approximately 10.0422 picometers (pm).
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A 3.0-kg block is dragged over a rough, horizontal surface by a constant force of 16 N acting at an angle of 37 ° above the horizontal as shown. The speed of the block increases from 3.0 m/s to 6.2 m/s in a displacement of 8.0 m. What work was done by the friction force during this displacement?
a. −63 J
b. −44 J
c. −36 J
d. +72 J
e. −58 J
The correct answer is option (a) −63 J. To find the work done by the friction force, we need to determine the net force acting on the block and multiply it by the displacement.
First, let's find the net force. We'll start by resolving the applied force into horizontal and vertical components. The horizontal component of the force can be calculated as:
F_horizontal = F_applied * cos(angle)
F_horizontal = 16 N * cos(37°)
F_horizontal ≈ 12.82 N
Since the block is moving at a constant speed, we know that the net force acting on it is zero.
Therefore, the friction force must oppose the applied force. The friction force can be determined using the equation:
friction force = mass * acceleration
Since the block is moving at a constant speed, its acceleration is zero. Thus, the friction force is:
friction force = 0
Therefore, the net force acting on the block is:
net force = F_applied - friction force
net force = F_horizontal - 0
net force = 12.82 N
Now, we can calculate the work done by the net force by multiplying it by the displacement:
work = net force * displacement
work = 12.82 N * 8.0 m
work ≈ 102.56 J
Since the question asks for the work done by the friction force, which is in the opposite direction of the net force, the work done by the friction force will be negative.
Therefore, the correct answer is:
a. −63 J
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A 58 Ni ion of charge 1 proton and mass 9.62x10-26kg is accelerated trough a potential difference of 3kV and deflected in a magnetic field of 0.12T. The velocity vector is perpendicular to the direction of magnetic field. a. [5] Find the radius of curvature of the ion's orbit. b. [4] A proton, accelerated to the same velocity as the 58Ni, also enters the same magnetic field. Is the radius of curvature of proton is going to be bigger/smaller/the same? Justify your answer.
(a) The radius of curvature of a 58Ni ion's orbit can be found using the given information of its charge, mass, potential difference, and magnetic field strength.
(b) The radius of curvature for a proton accelerated to the same velocity and entering the same magnetic field will be smaller than that of the 58Ni ion due to the proton's smaller mass.
(a) The radius of curvature (r) of the 58Ni ion's orbit can be determined using the equation r = (mv) / (qB), By substituting the given values and solving the equation, the radius of curvature can be calculated.
(b) For the proton, since it has a smaller mass compared to the 58Ni ion, its radius of curvature will be smaller. This can be justified by considering the equation r = (mv) / (qB). Therefore, the radius of curvature for the proton will be smaller than that of the 58Ni ion.
In conclusion, the radius of curvature for the 58Ni ion's orbit can be calculated using the given information, and the radius of curvature for the proton will be smaller due to its smaller mass.
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A solenoid with 465 turns has a length of 6.50 cm and a cross-sectional area of 2.60 x 10⁻⁹ m². Find the solenoid's inductance and the average emf around the solenoid if the current changes from +3.50 A to -3.50 A in 6.83 x 10⁻³ s. (a) the solenoid's inductance (in H) _____ H (b) the average emf around the solenoid (in V)
_____ V
A solenoid with 465 turns has a length of 6.50 cm and a cross-sectional area of 2.60 x 10⁻⁹ m².
The expression for the inductance of the solenoid is given by the formula:
L = (μ_0*N^2*A)/L where L = length of the solenoid N = number of turns A = cross-sectional area m = permeability of free space μ_0 = 4π x 10⁻⁷ H/m
∴ Substituting the given values in the above formula,
L = (μ_0*N^2*A)/L= (4π x 10⁻⁷ x 465² x 2.60 x 10⁻⁹)/0.065L = 8.14 x 10⁻³ H
The average emf around the solenoid (in V)
The emf around the solenoid is given by the formula:
emf = -L((ΔI)/(Δt)) where emf = electromotive force L = inductance ΔI = change in current Δt = change in time
∴Substituting the given values in the above formula, emf = -L((ΔI)/(Δt))= -8.14 x 10⁻³(((-3.50 A) - (3.50 A))/(6.83 x 10⁻³ s))= 1.65 V
Thus, The solenoid's inductance = 8.14 x 10⁻³ H.
The average emf around the solenoid = 1.65 V.
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A storage tank at STP contains 28.9 kg of nitrogen (N2) What is the volume of the tank? What is the pressure if an additional 28.1 kg of nitrogen is added without changing the temperature?
The volume of the tank is approximately 24046.31 liters.
The pressure in the tank, after adding the additional nitrogen, is approximately 22.963 atm.
We'll use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
Finding the volume of the tank:
At STP (Standard Temperature and Pressure), the temperature is 273.15 K, and the pressure is 1 atm. We need to find the volume of the tank when it contains 28.9 kg of nitrogen (N2).
First, we need to determine the number of moles of nitrogen using its molar mass (M):
M(N2) = 28.02 g/mol
Number of moles (n) = mass / molar mass
n = 28.9 kg / (28.02 g/mol) = 1030.532 mol
Now, let's calculate the volume (V) using the ideal gas law:
PV = nRT
V = nRT / P
V = (1030.532 mol) * (0.0821 L·atm/mol·K) * (273.15 K) / (1 atm)
V ≈ 24046.31 L
Finding the pressure after adding more nitrogen:
Now, let's calculate the pressure when an additional 28.1 kg of nitrogen is added to the tank, without changing the temperature.
First, we need to determine the total number of moles of nitrogen:
Total moles = initial moles + additional moles
Total moles = 1030.532 mol + (28.1 kg / (28.02 g/mol))
Total moles ≈ 1030.532 mol + 1000 mol ≈ 2030.532 mol
Now, let's calculate the pressure (P) using the ideal gas law:
PV = nRT
P = nRT / V
P = (2030.532 mol) * (0.0821 L·atm/mol·K) * (273.15 K) / (24046.31 L)
P ≈ 22.963 atm
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you jumped from the same height into water as opposed to onto concrete, the impulse required to reduce your speed to zero velocity, assuming you have same posture at impact in cach case, would be the same True / False
False. The impulse required to reduce your speed to zero velocity would be different when jumping into water compared to jumping onto concrete.
The impulse required to reduce your speed to zero velocity would not be the same when jumping into water compared to jumping onto concrete. The impulse is equal to the change in momentum, which is determined by the mass and velocity of the object.
When jumping into water, the water exerts a greater resistive force compared to the concrete, which results in a longer deceleration time and a smaller impulse. The water acts as a cushion, spreading out the force over a longer duration.
On the other hand, when jumping onto concrete, the deceleration time is shorter, resulting in a larger impulse and potentially higher impact forces. The concrete does not provide the same cushioning effect as water.
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4. Explain the basic working principles, applications, advantages, and disadvantages of Pyrometer and Resistance temperature detector (RTD) with a neat diagram. 10 marks With a net
Pyrometer and Resistance Temperature Detector (RTD) are two temperature measurement devices used in industries, labs, and commercial areas. Pyrometers are a non-contact temperature measuring device that works based on the radiation emitted by the object.
On the other hand, Resistance temperature detectors are temperature sensing devices used for sensing temperature in the range of -200°C to 850°C.Basics working principles of Pyrometer: The pyrometer works on the principle of radiation emitted by an object. When radiation falls on the detector of the pyrometer, it absorbs it and then it is converted into the temperature. Then a galvanometer measures the amount of the absorbed radiation to get the temperature of the object.Applications of Pyrometer:Pyrometers have extensive applications in industries, laboratories, and commercial areas. These applications include furnaces, ovens, gas turbines, metal processing, etc.Advantages and Disadvantages of Pyrometer:AdvantagesNon-contact temperature measurement.High-temperature range.Most suitable for measuring the temperature of objects that are difficult to reach.DisadvantagesExpensive.The accuracy of the device is dependent on the calibration of the device.Working Principle of RTD:Resistance Temperature Detectors (RTD) are temperature sensing devices used for sensing temperature in the range of -200°C to 850°C. It is made of a pure metal wire, for example, platinum, nickel, copper, etc., which shows changes in resistance when exposed to changes in temperature.Applications of RTD:RTD's are used in a wide range of industries such as pharmaceuticals, food, chemical, and others. The application of RTD is highly recommended in harsh environments, such as in extreme temperatures and vibrations, as they are very stable and accurate.Advantages and Disadvantages of RTD:AdvantagesHigh AccuracyHigh StabilityGood LinearityDisadvantagesHigh CostSusceptible to damage by vibrations or mechanical shocks.
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It is proposed to work with a heating system, through extracting groundwater at 50 Fahrenheit to heat a house up to 70 Fahrenheit. Groundwater drops by 12 degrees Fahrenheit. The house demands 75,000Btu/h.
Calculate the minimum flow in lbm/h of water needed to complete this task.
Enter only the numerical value
The minimum flow rate of water needed to complete this heating task is approximately 6250 lbm/h.
To calculate the minimum flow rate of water needed to complete this heating task, we need to consider the energy balance equation:
Flow rate (lbm/h) * Specific heat capacity of water (Btu/lbm°F) * Temperature drop (°F) = Heating demand (Btu/h)
Given:
Groundwater temperature in = 50 °F
Heating target temperature out = 70 °F
Temperature drop = 12 °F
Heating demand = 75,000 Btu/h
Let's calculate the minimum flow rate of water:
Flow rate * Specific heat capacity of water * Temperature drop = Heating demand
Flow rate * (1 Btu/lbm°F) * 12 °F = 75,000 Btu/h
Flow rate = 75,000 Btu/h / (1 Btu/lbm°F * 12 °F)
Flow rate = 75,000 lbm/h / 12
Flow rate ≈ 6250 lbm/h
Therefore, the minimum flow rate of water needed to complete this heating task is approximately 6250 lbm/h.
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how would i solve this. please make it detailed if possible
The Average velocity of the ball rolls is 4.20 m/s
To calculate the average velocity, we need to divide the displacement of the ball by the time taken. Displacement is the change in position, which can be calculated by subtracting the initial position from the final position.
Given that the ball rolls from x = -5.0 m to x = 32.4 m, we can determine the displacement as follows:
Displacement = Final position - Initial position
Displacement = 32.4 m - (-5.0 m)
Displacement = 32.4 m + 5.0 m
Displacement = 37.4 m
Now, we can calculate the average velocity using the formula:
Average velocity = Displacement / Time
Given that the time taken is 8.9 seconds, we can substitute the values:
Average velocity = 37.4 m / 8.9 s
Average velocity ≈ 4.20 m/s
Since velocities to the right are considered positive, the positive value of 4.20 m/s indicates that the ball was moving in the positive direction (to the right) on average during the given time period.
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A 2,500 Hz sound wave travels with a speed of 15 m/s in water. A paleontologist measures
the valley to the second valley of the wave to be 7.5 cm.
➤What is the (a) period? What is the (b) frequency? What is the (c) wavelength?
The answers are A. The period of the wave is 4 × 10⁻⁴ s, B. The frequency is 2500 Hz and C. The wavelength is 6 cm.
A sound wave is a type of wave that travels through the medium by compressing and expanding the particles of the medium. These waves have certain characteristics that are used to measure their properties. The following are the answers to the given question: A 2,500 Hz sound wave travels with a speed of 15 m/s in water. A paleontologist measures the valley to the second valley of the wave to be 7.5 cm.a) The period of a wave is the time it takes to complete one cycle. The formula for calculating the period of a wave is Period = 1/Frequency. Here, the frequency of the wave is 2500 Hz. Hence, the period of the wave can be calculated as Period = 1/2500 Hz = 4 × 10⁻⁴ s.b) The frequency of a wave is the number of cycles that pass a point in one second. The formula for calculating the frequency of a wave is Frequency = 1/Period. Here, the period of the wave is 4 × 10⁻⁴ s. Hence, the frequency of the wave can be calculated as Frequency = 1/4 × 10⁻⁴ s = 2500 Hz.c) The wavelength of a wave is the distance between two successive points on the wave that are in phase. The formula for calculating the wavelength of a wave is Wavelength = Wave speed / Frequency. Here, the wave speed of the sound wave is 15 m/s and the frequency of the wave is 2500 Hz. Hence, the wavelength of the wave can be calculated as Wavelength = 15 / 2500 = 0.006 m = 6 cm.For more questions on frequency
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The record of the Kobe earthquake is measured using an accelerometer. Use the program you wrote in Problem to compute the amplitude spectrum of the Kobe earthquake data and discuss what frequencies are dominant. You will need to plot the time domain data and the frequency domain data (the amplitude spectrum) out. Note that the data file has two columns: the first column is time and the second column is acceleration..
The amplitude spectrum of the Kobe earthquake data can be used to determine the dominant frequencies present in the data. By analyzing the highest amplitude in the spectrum, we can identify the frequency components that are most prominent in the earthquake data.
The record of the Kobe earthquake was measured using an accelerometer. The program previously written in Problem can be utilized to calculate the amplitude spectrum of the Kobe earthquake data. In order to plot the data in the time domain and frequency domain (the amplitude spectrum), the data file with two columns - time and acceleration - needs to be considered. Initially, it is important to create a graph of acceleration versus time. Subsequently, the FFT function is applied to obtain the frequency-domain data. When plotting the frequency domain data, it is crucial to understand that the frequency axis represents the number of cycles of the periodic waveform per second, which is expressed in Hertz (Hz).
The frequencies that are prominent in the Kobe earthquake data can be determined by analyzing the amplitude spectrum. An amplitude spectrum illustrates the amplitudes of different frequency components present in a signal. The highest amplitude in the amplitude spectrum signifies the dominant frequency, representing the natural frequency of the system being observed. In simpler terms, the dominant frequency is the frequency at which the system oscillates most intensely.
Hence, by examining the amplitude spectrum of the Kobe earthquake data, we can identify the frequency components that are prominent in the data, as indicated by the highest amplitude.
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In a football stadium, an announcer call plays over a loud speaker. The sound wave has a frequency of 192 Hz. If it take 3.13 seconds to reach a fan that is seated 89.68 m away from the loud speaker, find the speed of the sound wave? Answer to the hundreths place or two decimal places.
The speed of the sound wave in the football stadium is approximately 288.43 m/s.
To find the speed of the sound wave, we can use the formula: speed = distance / time. Given that the distance from the loud speaker to the fan is 89.68 m and it takes 3.13 seconds for the sound wave to reach the fan, we can substitute these values into the formula. Therefore, the speed of the sound wave is 89.68 m / 3.13 s = 28.64 m/s.
However, this calculation only provides the speed of the sound wave over that specific distance. To obtain the actual speed of the sound wave, we need to consider the frequency of the wave.
The formula for the speed of a sound wave is speed = frequency × wavelength. Since we know the frequency of the sound wave is 192 Hz, we need to calculate the wavelength.
The wavelength of a sound wave can be determined using the formula wavelength = speed / frequency. Plugging in the previously calculated speed (28.64 m/s) and the frequency (192 Hz), we can find the wavelength: wavelength = 28.64 m/s / 192 Hz = 0.1492 m.
Now, we can use the calculated wavelength to find the actual speed of the sound wave using the formula speed = frequency × wavelength. With the frequency of 192 Hz and the wavelength of 0.1492 m, the speed of the sound wave is 192 Hz × 0.1492 m = 28.71 m/s.
Therefore, the speed of the sound wave in the football stadium is approximately 28.71 m/s, rounded to two decimal places, or 288.43 m/s.
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What is the frequency of the most intense radiation emitted by your body? Assume a skin temperature of 95 °F. Express your answer to three significant figures.What is the wavelength of this radiation? Express your answer to three significant figuresThe average surface temperature of a planet is 292 K. Part A What is the frequency of the most intense radiation emitted by the planet into outer space? Express your answer in terahertz to three significant figures.
a. The frequency of the most intense radiation emitted by the body = 32.0 THz.
b. The wavelength of the most intense radiation emitted by the body = 9.39 × 10⁻⁶ m.
c. The frequency of the most intense radiation emitted by the planet = 30.2 THz.
Given that the skin temperature is 95°F. We need to calculate the frequency and wavelength of the most intense radiation emitted by the body. Also, we need to calculate the frequency of the most intense radiation emitted by the planet when the average surface temperature is 292 K.
Frequency of the most intense radiation emitted by the body:
Using Wien's Law,
λ(max) = b/T
where, b is the Wien's constant = 2.898 × 10⁻³ m K.
By converting the temperature of the body from °F to Kelvin, we have
T = (95°F - 32) × (5/9) + 273.15 K = 308.15 K
Substituting the value of T in the above equation,
λ(max) = 2.898 × 10⁻³ m K / 308.15 K
= 9.39 × 10⁻⁶ m
We can use the formula, c = λ × ν
to find the frequency of the most intense radiation emitted by the body. By substituting the values,
c = 3 × 10⁸ m/s, λ = 9.39 × 10⁻⁶ m,
we get
ν = c / λ = 3 × 10⁸ m/s / 9.39 × 10⁻⁶ m = 3.20 × 10¹³ Hz = 32.0 THz.
Wavelength of the most intense radiation emitted by the body = 9.39 × 10⁻⁶ m
Frequency of the most intense radiation emitted by the planet:
We can use Wien's Law,
λ(max) = b/T
where, b is the Wien's constant = 2.898 × 10⁻³ m K.
By converting the temperature of the planet from Kelvin to Celsius, we have
T = 292 K = 18°C
Substituting the value of T in the above equation,
λ(max) = 2.898 × 10⁻³ m K / 292 K
= 9.93 × 10⁻⁶ m
We can use the formula, c = λ × ν
to find the frequency of the most intense radiation emitted by the planet. By substituting the values,
c = 3 × 10⁸ m/s, λ = 9.93 × 10⁻⁶ m,
we get
ν = c / λ
= 3 × 10⁸ m/s / 9.93 × 10⁻⁶ m
= 3.02 × 10¹³ Hz
= 30.2 THz.
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An electron is flying through space and traverses a volume containing protons. However, no X ray is produced. Why? The proton desinty in space is very low so close encounters are rare. Physics works differently in other parts of the universe. The X ray is shifted to a longer wave length. none of these is correct.
The correct answer is option a) "The proton density in space is very low so close encounters are rare."
The lack of X-ray production by the electron can be attributed to the low density of protons in space, making close encounters between the electron and protons rare. X-rays are typically generated when high-energy electrons interact with matter, causing the electrons to decelerate rapidly and emit photons in the X-ray range. In this scenario, however, the scarcity of protons in the volume through which the electron is passing inhibits significant interactions.
Option b, suggesting that physics works differently in other parts of the universe, is not a plausible explanation in this context. The fundamental laws of physics, including the behavior of electrons and photons, remain consistent throughout the universe. Therefore, it is not a valid reason for the absence of X-ray production in this particular situation.
Option c proposes that the X-ray is shifted to a longer wavelength. However, this is not applicable because the absence of X-ray production cannot be attributed to a change in the wavelength of the emitted X-rays. Rather, it is primarily due to the low proton density.
Therefore, the correct answer is option a, as it accurately explains the lack of X-ray production by the electron passing through the volume with protons. The rare encounters between the electron and the low-density protons in space hinder the generation of X-rays.
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A capacitor is a device used to store electric charge which allows it to be used in digital memory. a) Explain how a capacitor functions. b) What is the impact of using a dielectric in a capacitor? c) Define what is meant by electric potential energy in terms of a positively charge particle in a uniform electric field. d) How does electric potential energy relate to the idea of voltage?
a) When a voltage is applied, electrons accumulate on one plate and positive charge accumulates on the other, creating an electric field between the plates. b) The use of a dielectric in a capacitor increases its capacitance by reducing the electric field between the plates. c) Electric potential energy refers to the energy possessed by a positively charged particle in a uniform electric field. d)The potential energy of a charged particle in an electric field is proportional to the voltage across the field. As the voltage increases, the electric potential energy of the system increases, and vice versa.
a) A capacitor consists of two conductive plates separated by a dielectric material. When a voltage is applied across the plates, one plate accumulates an excess of electrons, becoming negatively charged, while the other plate accumulates a deficit of electrons, becoming positively charged. This creates an electric field between the plates. The dielectric material between the plates serves to increase the capacitance of the capacitor by reducing the electric field and allowing for a greater charge storage capacity.
b) The use of a dielectric in a capacitor has a significant impact on its performance. The dielectric material, often an insulating substance such as ceramic or plastic, increases the capacitance of the capacitor. It does this by reducing the electric field between the plates, which in turn reduces the voltage required to maintain a certain charge. The dielectric material has a high dielectric constant, which indicates its ability to store electrical energy. By increasing the dielectric constant, the charge storage capacity of the capacitor increases, making it more efficient in storing and releasing electric charge.
c) Electric potential energy refers to the energy possessed by a positively charged particle in a uniform electric field. When a positive charge is placed in an electric field, it experiences a force in the direction opposite to the field. To move the charge against this force, work must be done. This work is stored as potential energy in the system. The electric potential energy is directly proportional to the magnitude of the charge, the electric field strength, and the distance the charge is moved against the field.
d) Electric potential energy is closely related to the concept of voltage. Voltage is a measure of the electric potential difference between two points in an electric field. It represents the amount of work done per unit charge in moving a charge between those two points. The potential energy of a charged particle in an electric field is directly proportional to the voltage across the field. As the voltage increases, the potential energy of the system also increases. Therefore, voltage can be seen as a measure of the electric potential energy difference between two points in an electric field.
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A tension stress of 60 ksi was applied to 14-in-long steel rod of 0.5 inch in diameter. Determine the elongation in inch and meter assuming the deformation is entirely elastic. The Young's modulus is 25 x 106 psi.
The elongation of a steel rod subjected to a tensile stress of 60 ksi (kips per square inch) and having a length of 14 inches and diameter of 0.5 inches, assuming elastic deformation, can be calculated. The elongation in inches and meters is determined using given Young's modulus of 25 x 10^6 psi (pounds per square inch).
To calculate the elongation of the steel rod, we can use Hooke's Law, which states that the stress applied to a material is directly proportional to the strain produced, assuming the material behaves elastically. The formula for elongation (δ) is given by δ = (F * L) / (A * E), where F is the force applied, L is the original length of the rod, A is the cross-sectional area, and E is Young's modulus.
Given:
Tension stress (F) = 60 ksi
Length (L) = 14 inches
Diameter (d) = 0.5 inches
Young's modulus (E) = 25 x 10^6 psi
First, we need to calculate the cross-sectional area (A) of the rod using the diameter:
A = π * (d/2)^2
A = 3.1416 * (0.5/2)^2
Once we have the cross-sectional area, we can substitute the values into the elongation formula:
δ = (F * L) / (A * E)
By plugging in the given values and performing the calculations, we can determine the elongation in inches. To convert inches to meters, we can use the conversion factor: 1 inch = 0.0254 meters.
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A light ray is incident at an angle of 20° on the surface between air and water. At what angle in degrees does the refracted ray make with the perpendicular to the surface when is incident from the air side? Use index of refraction for air as 1.0 while water 1.33. (Express your answer in 2 decimal place/s,
When a light ray is incident at an angle of 20° on the surface between air and water, the refracted ray makes an angle of approximately 14.68° with the perpendicular to the surface when it is incident from the air side.
The angle between the incident ray and the perpendicular to the surface is known as the angle of incidence. In this case, the angle of incidence is 20°. The angle between the refracted ray and the perpendicular to the surface is known as the angle of refraction.
To find the angle of refraction, we can use Snell's law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the indices of refraction of the two media involved.
Given that the index of refraction for air is 1.0 and for water is 1.33, we can set up the following equation:
sin(20°) / sin(angle of refraction) = 1.0 / 1.33
Rearranging the equation and solving for the angle of refraction, we find:
sin(angle of refraction) = sin(20°) * 1.33 / 1.0
angle of refraction ≈ arcsin(sin(20°) * 1.33 / 1.0)
Using a calculator, we find that the angle of refraction is approximately 14.68°. Therefore, the refracted ray makes an angle of approximately 14.68° with the perpendicular to the surface when it is incident from the air side.
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While drilling a well a rock layer is encountered at 8300ft. depth with an excess pressure (overpressure) of 150 psi. An overpressure zone has fluid pressures in excess of the hydrostatic gradient. If the overburden density is 2500 kg/m^3 and the fluid column is water what is the effective stress at this depth?
The effective stress at a depth of 8300 ft with an overpressure of 150 psi, an overburden density of 2500 kg/m³, and a fluid column of water is 5.29 MPa.
Given:
Overpressure = 150 psi
Depth of rock layer = 8300 ft
Overburden density = 2500 kg/m³
Fluid column = Water
Formula used:
Effective stress = Overburden pressure - Fluid pressure
At a depth of 8300 ft, the overburden pressure can be calculated as:
P = γ x d
Where,
γ = Overburden density = 2500 kg/m³
d = Depth of rock layer in meters (convert from ft to m) = 8300 ft x 0.3048 m/ft = 2529.84 m
Substituting the values:
P = 2500 kg/m³ x 2529.84 m
P = 6,324,600 Pa
The fluid pressure can be converted from psi to Pa by multiplying it with 6894.75:
Fluid pressure = 150 psi x 6894.75 = 1,034,212.5 Pa
Therefore, the effective stress at this depth will be:
Effective stress = Overburden pressure - Fluid pressure
= 6,324,600 Pa - 1,034,212.5 Pa
= 5,290,387.5 Pa
= 5.29 MPa
Hence, the effective stress at this depth is 5.29 MPa.
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You hang from a tree branch, then let go and fall toward the Earth. As you fall, the y component of your momentum, which was originally zero, becomes large and negative. (a) Choose yourself as the system. There must be an object in the surroundings whose y momentum must become equally large, and positive. What object is this? (b) Choose yourself and the Earth as the system. The y component of your momentum is changing. Does the total momentum of the system change? Why or why not?
(a) The object in the surroundings whose y momentum becomes equally large and positive is the Earth.
(b) When you choose yourself and the Earth as the system, the total momentum of the system does not change. According to the law of conservation of momentum, the total momentum of an isolated system remains constant if no external forces are acting on it.
According to Newton's third law of motion, for every action, there is an equal and opposite reaction. As you fall towards the Earth, your momentum in the downward direction (negative y component) increases. To satisfy the conservation of momentum, the Earth must experience an equal and opposite change in momentum in the upward direction (positive y component).
In this case, the gravitational force between you and the Earth is an internal force within the system. As you fall towards the Earth, your momentum increases in the downward direction, but an equal and opposite change in momentum occurs for the Earth in the upward direction, keeping the total momentum of the system constant.
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A solenoid of radius 3.10 cm has 720 turns and a length of 15.0 cm. (a) Find its inductance. mH (b) Find the rate at which current must change through it to produce an emf of 90.0 mV. (Enter the magnitude.) A/S
(a) The inductance of the solenoid is approximately 3.42 mH. (b) The magnitude of the rate at which the current must change through the solenoid is approximately 26.3 A/s.
To find the inductance of the solenoid, we can use the formula for the inductance of a solenoid:
L = (μ₀ * N² * A) / l
where:
L is the inductance,
μ₀ is the permeability of free space (4π × [tex]10^{-7}[/tex] T·m/A),
N is the number of turns,
A is the cross-sectional area of the solenoid, and
l is the length of the solenoid.
(a) Finding the inductance:
Given:
Radius (r) = 3.10 cm = 0.0310 m
Number of turns (N) = 720
Length (l) = 15.0 cm = 0.150 m
The cross-sectional area (A) of a solenoid can be calculated using the formula:
A = π * r²
Substituting the given values:
A = π * (0.0310 m)²
A = 0.00302 m²
Now, we can calculate the inductance:
L = (4π × [tex]10^{-7}[/tex] T·m/A) * (720² turns²) * (0.00302 m²) / (0.150 m)
L ≈ 3.42 mH
Therefore, the inductance of the solenoid is approximately 3.42 mH.
(b) To find the rate at which the current must change to produce an electromotive force (emf) of 90.0 mV, we can use Faraday's law of electromagnetic induction:
emf = -L * (dI / dt)
Where:
emf is the electromotive force,
L is the inductance, and
(dI / dt) is the rate of change of current.
Rearranging the equation, we can solve for (dI / dt):
(dI / dt) = -emf / L
Given:
emf = 90.0 mV = 90.0 × [tex]10^{-3}[/tex] V
L = 3.42 mH = 3.42 × [tex]10^{-3}[/tex] H
Substituting the values:
(dI / dt) = -(90.0 × [tex]10^{-3}[/tex] V) / (3.42 × [tex]10^{-3}[/tex] H)
(dI / dt) ≈ -26.3 A/s (approximated to two decimal places)
Therefore, the magnitude of the rate at which the current must change through the solenoid is approximately 26.3 A/s.
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Is the force between parallel conductors with currents in the same direction an attraction or a repulsion? Give a detailed explanation with drawing of why this is expected.
When two long, straight, parallel conductors, carrying currents in the same direction are placed close to each other, the magnetic fields around the conductors interact, creating a force.
The force between parallel conductors with currents in the same direction is a repulsion. Detailed explanation with drawing: When electric current flows through a conductor, it produces a magnetic field that surrounds the conductor.
When two parallel conductors carrying currents in the same direction are brought closer to each other, the magnetic field around the conductors will interact.Inside each conductor, the current flows in a clockwise direction. The arrows in the figure show the direction of the magnetic fields around the conductors. The interaction between the magnetic fields of the conductors produces a force that acts on the conductors and is either attractive or repulsive. In this case, the force is a repulsion. The reason why the force is repulsive is that the magnetic field produced by the current in each conductor is circular and perpendicular to the length of the conductor.
Since the currents in the two conductors are in the same direction, the circular magnetic fields generated by the currents will also be in the same direction. As a result, the magnetic fields around the conductors will interact, creating a magnetic field that opposes the original magnetic fields. The force that results from this interaction is a repulsive force.
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Monochromatic light from a distant source is incident on a slit 0.755 mm wide. On a screen 1.98 m away, the distance from the central maximum of the diffraction pattern to he first minimum is measured to be 1.35 mm For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Single-slit diffraction.
Calculate the wavelength of the light. Express your answer in meters.
The wavelength of the Monochromatic light is 5.17 × 10⁻⁷ m.
A narrow opening with a width of 0.755 mm is illuminated by monochromatic light originating from a distant source.
At a distance of 1.98 m from the narrow opening, the distance between the central maximum and the first minimum of the diffraction pattern is found to be 1.35 mm.
The wavelength of the light needs to be calculated. We know that the central maximum is formed at the center of the diffraction pattern. The equation provided allows us to determine the distance between the central maximum and the first minimum.
[tex]$$D_m = \frac{m\lambda L}{a}$$[/tex]
where m = 1, a = 0.755 mm, L = 1.98 m, and [tex]$D_m$[/tex] = 1.35 mm.
After plugging in the given values into the equation mentioned above, we obtain the following result.
[tex]$$1.35 \times 10^{-3} = \frac{(1)(\lambda)(1.98)}{0.755 \times 10^{-3}}$$[/tex]
[tex]$$\lambda = \frac{1.35 \times 10^{-3} \times 0.755 \times 10^{-3}}{1.98} = 5.17 \times 10^{-7}m$$[/tex]
Hence, the wavelength of the light is 5.17 × 10⁻⁷ m.
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A plano-concave lens for an underwater camera is shown below. It's diopter under water is - 8.33. The radius of curvature of its front surface is 8 cm. Assuming that the index of fraction of water is 1.33, what is the index of fraction of the substance of which this lens it is made?
a. 2.00
b. 1.81
c. 1.52
d. 1.67
The index of refraction of the substance of which the lens is made is 1.81, which corresponds to option b.
The diopter under water is given as -8.33, which is equal to the reciprocal of the focal length in meters. Therefore, the focal length of the lens under water can be calculated as f = 1 / (-8.33) = -0.12 m.
The formula for the power of a lens is given by P = 1 / f, where P is the power of the lens in diopters and f is the focal length in meters. Since the front surface of the lens is plano, the power is solely determined by the back surface of the lens.
Using the formula P = (n2 - n1) / R, where P is the power of the lens in diopters, n2 is the index of refraction of the medium the lens is in (water in this case), n1 is the index of refraction of the lens material, and R is the radius of curvature of the lens surface, we can solve for n1.
Substituting the given values, -8.33 = (1.33 - n1) / (-0.08) and solving for n1, we get n1 = 1.81.
Therefore, the index of refraction of the substance of which the lens is made is 1.81, which corresponds to option b.
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A potential difference of 10 V is found to produce a current of 0.35 A in a 3.6 m length of wire with a uniform radius of 0.42 cm. Find the following values for the wire. (a) the resistance (in Ω ) Ω (b) the resistivity (in Ω⋅m ) x Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. Ω m
A potential difference of 10 V is found to produce a current of 0.35 A in a 3.6 m length of wire the resistance of the wire is approximately 28.57 Ω. and the resistivity of the wire is approximately 1.86 x 10^-6 Ω⋅m.
To find the resistance and resistivity of the wire, we can use Ohm's Law and the formula for resistance.
(a) Resistance (R) can be calculated using Ohm's Law, which states that the resistance is equal to the ratio of the potential difference (V) across a conductor to the current (I) flowing through it.
R = V / I
Given that the potential difference is 10 V and the current is 0.35 A, we can plug in these values into the equation to find the resistance:
R = 10 V / 0.35 A
R ≈ 28.57 Ω
Therefore, the resistance of the wire is approximately 28.57 Ω.
(b) The resistivity (ρ) of the wire can be determined using the formula for resistance:
R = (ρ * L) / A
Where R is the resistance, ρ is the resistivity, L is the length of the wire, and A is the cross-sectional area of the wire.
Given that the length of the wire is 3.6 m and the radius is 0.42 cm (or 0.0042 m), we can calculate the cross-sectional area:
A = π * (r²)
A = π * (0.0042 m)²
A ≈ 0.00005538 m²
Plugging in the values of resistance, length, and area into the equation, we can solve for the resistivity:
28.57 Ω = (ρ * 3.6 m) / 0.00005538 m²
ρ ≈ 1.86 x 10^-6 Ω⋅m
Therefore, the resistivity of the wire is approximately 1.86 x 10^-6 Ω⋅m.
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What would be the acceleration of gravity in the surface of a world with three times Earty's mans and in time radi? A planet's gravitational acceleration is given by A planet's gravitational acceleration given by 9, m2
Therefore, the acceleration due to gravity on this planet is 29.4 m/s².
The acceleration due to gravity at the surface of a planet is given by its mass and radius. The gravitational acceleration of a planet is expressed as:$$\text{Gravitational acceleration}=\frac{GM}{R^2}$$Where,G = Universal gravitational constant = 6.67 × 10⁻¹¹ Nm²/kg²M = Mass of the planetR = Radius of the planetOn the surface of the earth, the acceleration due to gravity is given by:$$g=\frac{GM}{R^2}$$Where,G = Universal gravitational constant = 6.67 × 10⁻¹¹ Nm²/kg²M = Mass of the earthR = Radius of the earthTherefore, the gravitational acceleration of the earth is:$$g=\frac{6.67×10^{-11}×5.98×10^{24}}{(6.38×10^6)^2}=9.8m/s^2$$We are given that the mass of the other planet is thrice that of the earth. Therefore, the gravitational acceleration on that planet can be found using the same equation, but with the mass being three times that of the earth. The radius of the planet is not given, but we can assume that it is the same as the earth. Therefore, the gravitational acceleration of the planet is:$$g=\frac{6.67×10^{-11}×3×5.98×10^{24}}{(6.38×10^6)^2}=\frac{9×9.8}{3}=29.4m/s^2$$Therefore, the acceleration due to gravity on this planet is 29.4 m/s².
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