Taking into account the definition of kinetic energy and work, the kinetic energy of a ball of mass 50 g travelling at 30 m/s is 22.5 J and a work of 22.5 J must be done in an opposite direction to stop the ball.
Definition of kinetic energyKinetic energy is defined as the energy associated with bodies that are in motion.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed. This will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.
Kinetic energy is represented by the following expression:
Ec = 1/2×m×v²
Where:
Ec is kinetic energy, which is measured in Joules (J).m is mass measured in kilograms (kg).v is velocity measured in meters over seconds (m/s).Definition of workThe kinetic energy theorem states that the work done by the applied net force (sum of all forces) is equal to the change in kinetic energy:
Work= Ec final - Ec original
Kinetic energy of the ballIn this case, you know:
m= 50 g= 0.05 kg (being 1000 g= 1 kg)v= 30 m/sReplacing in the definition of kinetic energy:
Ec = 1/2× 0.05 g× (30 m/s)²
Solving:
Ec= 22.5 J
The kinetic energy is 22.5 J.
Work to stop the ballStoping the ball means bringing the velocity to zero. This is:
Ec final= 1/2× 0.05 g× (0 m/s)²
Ec final= 0
Then, work can be calculated as:
Work= Ec final - Ec initial
Work= 0 - 22.5 J
Work= -22.5 J
This means that a work of 22.5 J must be done in an opposite direction.
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the earth is approximately 8000 miles in diameter. i'm riding in a hot air balloon 1.5 miles above the surface of the earth. approximately how far away is the horizon?
The horizon is approximately 3,474 miles away when viewed from 1.5 miles above the surface of the Earth.
Calculation: The radius of the Earth is 4,000 miles, so the circumference of the Earth is 8,000 miles (2pir). The distance to the horizon is the circumference divided by 2pi, or 8,000 miles / 2pi = 3,474 miles.
The horizon is approximately 1.32 × √ (h) miles away, where h is the height of the observer above the surface of the Earth. Given the Earth's diameter, an observer in a hot air balloon at 1.5 miles above the surface of the Earth would be approximately 1.32 × √ (1.5) miles from the horizon.
The calculation is done as follows.1.32 × √ (1.5) miles= 1.32 × √ (1.5) miles = 1.32 × 1.22 miles= 1.61 miles So, an observer in a hot air balloon 1.5 miles above the surface of the Earth would be approximately 1.61 miles away from the horizon.
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explain why an uncertainty relation arises naturally when we superpose waves with different frequencies.
The uncertainty principle relates two distinct complementing features, neither of which can be precisely known at the same time, by the word "uncertainty."
The "uncertainty" lower bound is defined by Heisenberg's uncertainty principle, which asserts that a given function cannot be arbitrarily compact in both time and frequency. Gaussian functions achieve this bound for continuous-time signals by using variance as a measure of localization in time and frequency.
According to the superposition principle, the resultant disturbance is equal to the algebraic total of the individual disturbances when two or more waves overlap in space. (This is occasionally broken for significant disturbances; see Nonlinear interactions below.)
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the constant load p is applied to ball a as shown. as a result the system moves to the right on the smooth surface and during the process the spring stretches and contracts. what physical quantity is constant during the process?
The constant load p is applied to ball a as shown. as a result the system moves to the right on the smooth surface and during the process the spring stretches and contracts. The physical quantity that is constant during the process is applied to Ball A is the total mechanical energy.
The total mechanical energy is the sum of the potential energy and kinetic energy of a system. In this scenario, when the constant load P is applied to Ball A, the system moves to the right on the smooth surface and during the process, the spring stretches and contracts. When the spring stretches, it stores the elastic potential energy, and when it contracts, it releases the potential energy to kinetic energy, causing the ball to move to the right. The process repeats, causing Ball A to oscillate back and forth.
The Law of Conservation of Energy states that the total energy of a system is constant if there are no external forces acting on it. When the ball is moving back and forth, the frictional forces acting on the ball are negligible because it's on a smooth surface. As a result, the total mechanical energy of the system is conserved.
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when a battery , resistor, and uncharged capacitor are connceted in series, how does the charge of the capacitor changes as a function of time
Answer: The charge on the capacitor increases exponentially as the capacitor charges. As time goes on, the rate of charging decreases, and the charge on the capacitor approaches Qmax. The charge on the capacitor does not change once it is fully charged.
An uncharged capacitor is connected in series with a battery and a resistor. When the circuit is closed, the current begins to flow, and the capacitor begins to charge. The voltage across the capacitor increases as the capacitor charges.
When a battery, resistor, and uncharged capacitor are connected in series, the charge of the capacitor changes as a function of time according to the equation:
Q = Qmax(1 - e^(-t/RC))
An uncharged capacitor is connected in series with a battery and a resistor. When the circuit is closed, the current begins to flow, and the capacitor begins to charge. The voltage across the capacitor increases as the capacitor charges.
When the voltage across the capacitor is equal to the battery voltage, the current stops flowing through the circuit. The capacitor is then fully charged, and the charge on the capacitor is Qmax. At this point, the voltage across the capacitor is equal to the battery voltage, and the current through the resistor is zero.
The charge on the capacitor, Q, changes as a function of time, t, according to the equation:
Q = Qmax(1 - e^(-t/RC))
where Qmax is the maximum charge on the capacitor, R is the resistance of the resistor, C is the capacitance of the capacitor, and e is the base of natural logarithms.
The charge on the capacitor increases exponentially as the capacitor charges. As time goes on, the rate of charging decreases, and the charge on the capacitor approaches Qmax. The charge on the capacitor does not change once it is fully charged.
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the gas transfers heat to the environment until it reaches a temperature of 300 k. b) what is the change in the internal energy of the gas(j)?
The change in internal energy of the gas is equal to the amount of heat it transferred to the environment. When the temperature of the gas increases from its initial temperature to 300 K, the change in its internal energy can be calculated using the equation ΔU = nCvΔT, where n is the number of moles, Cv is the molar specific heat capacity of the gas, and ΔT is the temperature change. In this case, ΔT = 300 K - initial temperature. The answer is therefore nCvΔT.
It is important to note that the heat transferred is equal to the change in internal energy because the process is adiabatic, meaning that no heat is gained or lost to the environment. As the temperature of the gas increases, the average kinetic energy of its molecules increases, resulting in an increase in the internal energy of the gas. The gas molecules move more quickly, causing more collisions with the walls of their container and increasing pressure. This is why an increase in temperature leads to an increase in internal energy.
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car a of mass 825.7 kg collide into rear end of car b of mass 1435.7 kg at rest. the bumpers lock and two cars skid forward together 3.9 m before stopping. if coefficient of friction with the road was 0.7, what was the speed of car a before collision?
The initial velocity of Car A before the collision was 10.75 m/s .
What was the speed of car a before collision?
Car A of mass 825.7 kg collides into the rear end of Car B of mass 1435.7 kg at rest. The bumpers lock, and the two cars skid forward together 3.9 m before stopping.
If the coefficient of friction with the road was 0.7, the speed of Car A before the collision was 10.75 m/s.
The net force acting on the system is equal to the force of friction. Therefore, we have that:
μmg = (ma + mb) v² / 2s
Where μ is the coefficient of friction, m is the mass of the object, g is the acceleration due to gravity, s is the distance, and v is the initial velocity of the object.
Car A has a mass of 825.7 kg and was initially moving before colliding into Car B.
Therefore, it had an initial velocity, which we need to calculate. Car B was initially at rest.
The total mass of the system is equal to the sum of the masses of Car A and Car B:
ma + mb = 825.7 + 1435.7
= 2261.4 kg
The coefficient of friction is given as 0.7, and the distance over which the cars skid is 3.9 m. Therefore, we have:
0.7 X 9.81 X 2261.4 = (825.7 + 1435.7) v² / (2 X 3.9)
Simplifying the equation gives:
v² = 2 X 0.7 X 9.81 X 2261.4 X 3.9 / (825.7 + 1435.7)
= 16518.32v
= √16518.32
= 128.4 m/s
However, this is the combined velocity of the two cars. To find the initial velocity of Car A before the collision, we can use conservation of momentum.
The total momentum before the collision is equal to the total momentum after the collision, which is zero (since the cars come to a stop).
ma X va = -(ma + mb) vb
va is the initial velocity of Car A, and vb is the initial velocity of Car B (which is zero).
Rearranging the equation gives:
va = -(ma + mb) vb / ma = -1435.7 X 0 / 825.7 = 0
Therefore, the initial velocity of Car A before the collision was 10.75 m/s (rounded to two decimal places).
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if the velocity of the fluid along the surface is 0.2 cm/s, calculate the maximum number of fish that can live in the water.
The maximum number of fish that can live in the water is dependent on several factors, such as the type of fish, water temperature, and water chemistry.
What is temperature?Temperature is a physical property that is the measure of the average kinetic energy of the particles that make up a substance. It is measured in units such as degrees Celsius (°C), Kelvin (K), and Fahrenheit (°F). Temperature is related to the speed of the particles in a substance; as the particles move faster, the temperature increases. Temperature affects how substances react with each other; for example, many chemical reactions occur faster at higher temperatures.
The velocity of the fluid along the surface, while important in terms of the oxygen content of the water, is not enough to accurately determine the maximum number of fish that can live in the water.
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A car rounds an unbanked curve of radius 80 m. If the coefficient of static friction between the road and car is 0.8, what is the maximum speed at which the car traverses the curve without slipping? V = _____ m/s
If the car rounds an unbanked curve of radius 80 m and the coefficient of static friction between the road and car is 0.8, then the maximum speed at which the car traverses the curve without slipping is V = 25.05 m/s.
The maximum speed at which the car traverses the curve without slipping can be determined using the following formula:
[tex]v = \sqrt{(\mu rg)}[/tex]
Where:
v = maximum speed
μ = coefficient of static friction
r = radius of curvature
g = acceleration due to gravity
Substituting the given values into the formula:
[tex]v = \sqrt {(\mu rg)}[/tex]
[tex]v = \sqrt{(0.8 \times 80 \times 9.81)}[/tex]
v = 25.05 m/s
Therefore, the maximum speed at which the car can traverse the curve without slipping is 25.05 m/s.
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a 77.11 kg archer, standing on frictionless ice, shoots a 101 g arrow at a speed of 98.89 m/s. what is the recoil speed of the archer?
The recoil speed of the archer is 2.07 m/s in the opposite direction of the arrow. This can be calculated using the conservation of momentum.
Momentum is defined as mass multiplied by velocity and is conserved during collisions.
The initial momentum of the archer-arrow system is 77.11 kg x 98.89 m/s = 7,624.14 kg m/s.
Since the arrow has a mass of 101 g, its velocity after the shot is 0 m/s, resulting in a final momentum of 7,523.14 kg m/s.
Since the total momentum is conserved, the velocity of the archer must be equal to the difference between the initial and final momentum divided by the mass of the archer: (7,624.14 - 7,523.14) / 77.11 = 2.07 m/s.
Therefore, the recoil speed of the archer is 2.07 m/s.
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these two resistors are in series. first, stop and trace the current flowing from the battery through the complete circuit. now, what is the current flowing through resistor r1?
The current flowing through resistor R1 since resistors in series have the same current running through them is the current flowing from the battery through the complete circuit.
To find the current flowing through resistor R1, first we need to trаce the current flowing from the bаttery through the complete circuit. The given resistors аre in series, which meаns they аre connected end-to-end, so the sаme current flows through both of them. Thus, the current flowing through the complete circuit is:
I = V/Rtotаl
where I is the current, V is the voltаge of the bаttery, аnd Rtotаl is the totаl resistаnce of the circuit.To find the totаl resistаnce of the circuit, we need to аdd the resistаnces of both resistors in series:
Rtotаl = R1 + R2
Thus, the current flowing through the complete circuit is:
I = V / (R1 + R2)
Now, to find the current flowing through resistor R1, we use Ohm's Lаw, which stаtes thаt the current through а resistor is proportionаl to the voltаge аcross it аnd inversely proportionаl to its resistаnce. Thus:
I1 = V/R1
where I1 is the current flowing through resistor R1. Substituting the vаlue of V from the previous equаtion, we get:
I1 = I * R1 / (R1 + R2)
Therefore, the current flowing through resistor R1 is I1 = I * R1 / (R1 + R2)
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a roller-coaster car doing a loop-the-loop will come off the track if its speed at the highest point drops below a critical speed. the condition that determines the critical speed is
Answer: n = 0 N at the highest point
Explanation:
The critical speed for a roller coaster car doing a loop-the-loop is determined by the condition that the normal force at the highest point is equal to zero.
At the highest point of the loop, the car experiences a net centripetal force provided by the normal force and the force of gravity. The normal force is directed radially inward and the force of gravity is directed radially downward. As the car loses speed, the normal force decreases until it reaches zero at the critical speed.
If the normal force becomes zero, the car would no longer experience a net centripetal force and it would lose contact with the track at the highest point, i.e., the car would come off the track.
The condition that determines the critical speed is the highest point has n = 0 N.
ConditionsThe requirement that the normal force at the highest point be equal to zero establishes the critical speed for a roller coaster car performing a loop-the-loop.The car feels a net centripetal force at the highest point of the loop, which is caused by both gravity and normal force. As gravity is pulling radially downward, the normal force is pulling inward. At the crucial speed, the normal force zeros out as the car slows down.The automobile would no longer suffer a net centripetal force if the normal force were to become zero, and it would come to rest at the highest point on the track.For more information on critical speed kindly visit to
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I have no clue what im doing..
If work = 100J and time = 20 seconds, what is power
Answer:
5 J/s or 5 watt
Explanation:
Given,
Work (W) = 100 J
Time (t) = 20 s
To find : Power (P)
Formula :
P = W/t
P = 100/20
P = 5 J/s
P = 5 watt
Note : -
J/s and watt are units are power.
a closely wound, circular coil with radius 2.20 cm has 780 turns. part a part complete what must the current in the coil be if the magnetic field at the center of the coil is 0.0760 t ? express your answer with the appropriate units. i
The current in the coil must be 3.20A if the magnetic field at the center of the coil is 0.0760T.
The formula used to calculate the magnetic field at the center of a circular coil is given as:
B = μ0*I*n*r² / 2*(r² + x²)³/2
Where,
B is the magnetic field at the center of the coil
I is the current in the coil
n is the number of turns
r is the radius of the coil
x is the distance between the center of the coil and the point where the magnetic field is to be calculated
μ0 is the permeability of free space.
Now, for the magnetic field at the center of the coil, x = 0, we have:
B = μ0*I*n*r² / 2*r³
I = 2*B*r³ / (μ0*n)
Putting the given values in this formula, we get:
I = 2*0.0760*2.20³ / (4π*10⁻⁷*780) = 3.20 A
Therefore, if the magnetic field at the center of the coil is 0.0760T, then the current in the coil must be 3.20A.
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if the same horizontal net force were exerted on both vehicles, pushing them from rest over the same distance, what is the ratio of their final kinetic energies?
If the same horizontal net force were exerted on both vehicles, pushing them from rest over the same distance, then the ratio of their final kinetic energies is 1:2.
According to the Work-Energy principle, the net work done on an object is equal to the change in its kinetic energy. This principle states that the work done on a particle is equal to the change in its kinetic energy. We can then conclude that the final kinetic energy of an object is equal to the work done on it by the force acting on it.
Therefore, when the same horizontal net force is exerted on both vehicles, pushing them from rest over the same distance, the amount of work done is the same for both vehicles. Hence, their final kinetic energies will be proportional to their masses because the formula for kinetic energy is KE = 1/2mv². The ratio of the final kinetic energies of both vehicles can be calculated as follows:KE1/KE2 = (1/2mv1²)/(1/2mv2²) = (v1/v2)². Here, v1 and v2 are the final velocities of the two vehicles. Since both vehicles are pushed over the same distance, their final velocities will be proportional to the square root of their masses, so the ratio of their final kinetic energies will be 1:2.
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jupiter has radius pf 11 x the radius of the eart and a mass that is 320x the mass of the earth the gravitational field strength on the surface of jupiter is
GEarth =9.8ms^-2
A 3Nkg^-1
B 300 NG^-1
C 26 NG^-1
D 10 Nkg -1
An object of mass m at the end of a staring if length r moves in a vertical circle at a concentration angle speed w what is tension in the sting when the object is at the bottom of the circle
An object of mass m love horizontal circle of radio ur with constant speed what is the rate at which works is down by the centripetal force
Answer:
C: 26 NG^-1
Part 2:
The rate at which work is done by the centripetal force is proportional to the cube of the velocity of the object.
Explanation:
The gravitational field strength on the surface of Jupiter can be calculated using the formula:
gJupiter = G×MJupiter / rJupiter²
where G is the universal gravitational constant, MJupiter is the mass of Jupiter, and rJupiter is the radius of Jupiter. Using the given values, we get:
gJupiter = (6.67 × 10-11 N m2 kg-2) × (320 × MEarth) / (11 × REarth)2
gJupiter = 26.0 N kg-1
Therefore, the answer is option C.
For the second question, when the object is at the bottom of the circle, the tension in the string is equal to the weight of the object plus the centripetal force required to keep it moving in the circular path. The centripetal force is given by:
Fc = mv2 / r
where m is the mass of the object, v is the velocity of the object, and r is the radius of the circle.
At the bottom of the circle, the velocity of the object is maximum and equal to the square root of the product of the centripetal force and the radius divided by the mass of the object:
v = sqrt(Fc × r / m)
Substituting the value of Fc in terms of v and solving for tension T, we get:
T = mg + mv2 / r
T = m(g + v2/ r)
For the third question, the rate at which work is done by the centripetal force is given by:
P = Fc × v
where P is the power, Fc is the centripetal force, and v is the velocity of the object. Substituting the value of Fc in terms of v, we get:
P = mv3 / r
Therefore, the rate at which work is done by the centripetal force is proportional to the cube of the velocity of the object.
Explanation:
Well this is quite tricky, as the gravitational field strength on the surface of Jupiter can be calculated using the formula:
g = G*M / r^2
Where G is the gravitational constant, M is the mass of Jupiter, and r is the radius of Jupiter.
Given that the radius of Jupiter is 11 times that of Earth (rJ = 11rE) and the mass of Jupiter is 320 times that of Earth (MJ = 320ME), we can substitute these values into the formula:
g = G x MJ / rJ^2
= G x (320ME) / (11rE)^2
= (G x 320 x ME) / (121 x rE^2)
Now, we know that G = 6.67 x 10^-11 N m^2 / kg^2 and gE = 9.8 m/s^2. So we can substitute these values and simplify:
g = (6.67 x 10^-11 N m^2 / kg^2 * 320 x ME) / (121 x rE^2)
= (2.14 x 10^16 N x ME) / rE^2
To get the gravitational field strength on the surface of Jupiter in terms of gE, we can divide g by gE:
g / gE = (2.14 x 10^16 N x ME) / (rE^2 x 9.8 m/s^2)
= (2.14 x 10^16 N x 5.97 x 10^24 kg) / ( (11 x 6.37 x 10^6 m)^2 x 9.8 m/s^2)
= 25.93
Therefore, the gravitational field strength on the surface of Jupiter is 25.93 times that of Earth.
Answer: C) 26 NG^-1
For an object of mass m at the end of a string of length r moving in a vertical circle at a constant angular speed w, the tension in the string at the bottom of the circle can be found using the formula:
T = mg + mv^2 / r
where g is the acceleration due to gravity, v is the velocity of the object at the bottom of the circle, and m is the mass of the object.
At the bottom of the circle, the object is moving horizontally, so the tension in the string is equal to the centripetal force required to keep it moving in a circle. The velocity of the object at the bottom of the circle can be found using the formula:
v = wr
where w is the angular speed of the object.
Substituting these values into the formula for tension, we get:
T = mg + m(wr)^2 / r
= mg + mw^2r
Therefore, the tension in the string at the bottom of the circle is T = mg + mw^2r.
Answer: T = mg + mw^2r
For an object of mass m moving in a horizontal circle of radius r with a constant speed v, the rate at which work is done by the centripetal force can be found using the formula:
W = Fc x v
where Fc is the centripetal force required to keep the object moving in a circle.
The centripetal force can be found using the formula:
Fc = mv^2 / r
Substituting this value into the formula for work, we get:
W = (mv^2 / r) x v
= mv^3 / r
Therefore, the rate at which work is done by the centripetal force is W = mv^3 / r.
Answer: W = mv^3
question 3 (3 points) a horizontal wire carries a large current. a second wire carrying a current in the same direction is suspended below it. can the current in the upper wire hold the lower wire in suspension against gravity? justify your answer.
The current in the upper wire is strong enough with a high magnetic field, it can easily support the lower wire's weight against gravity
According to the law of Ampere, two parallel current-carrying conductors attract one another. This is because of the generation of magnetic fields around the current-carrying wires, which cross over each other and produce a net magnetic field that pulls the wires together.
Hence, if the current in the upper wire is large enough, it can certainly hold the lower wire in suspension against gravity. The wires will attract one another, and the weight of the lower wire will be countered by the electromagnetic force between the wires.
The lower wire will continue to be suspended as long as the current in the upper wire is maintained at the required level.
If we consider a simple example, a thin, horizontal wire carrying a current is placed above another wire with the same current, both wires carry current in the same direction.
The current-carrying wires exert force on each other, and this force depends on the current's magnitude and distance between the wires.
The wires will repel each other if the currents are in opposite directions. If they are in the same direction, the wires will attract each other. When a vertical wire is placed under the horizontal wire, the magnetic field it creates will attract the horizontal wire.
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how strong an electric field is needed to accelerate electrons in an x-ray tube from rest to one-tenth the speed of light in a distance of 5.0 cm?
The electric field strength required to accelerate electrons in an X-ray tube from rest to one-tenth the speed of light over a distance of 5.0 cm is 1.2 × 10⁸ N/C.
What is an X-ray tube?
An X-ray tube is a cathode-ray tube that generates X-rays. It's a vacuum tube that consists of an electron gun and a fluorescent screen. The electron gun accelerates electrons towards the fluorescent screen, which causes it to emit X-rays. X-rays are used in medicine to capture images of bones and other internal organs of the human body.
The equation for the acceleration of an electron due to an electric field is:
a = F/m
where a is the acceleration of the electron
F is the force on the electron
m is the mass of the electron
To accelerate an electron from rest to one-tenth the speed of light, kinetic energy:
K = 1/2mv²
where K is the kinetic energy of the electron
m is the mass of the electron
v is the final speed of the electron
The initial kinetic energy is zero since the electron is at rest. Therefore, the change in kinetic energy is equal to the final kinetic energy. The change in kinetic energy can also be written as:
ΔK = W
where ΔK is the change in kinetic energy
W is the work done on the electron
The work done on the electron is equal to the product of the force on the electron and the distance over which the force is applied. Therefore:
W = Fd
where W is the work done on the electron
F is the force on the electron
d is the distance over which the force is applied
The equations for kinetic energy and work done on the electron:
ΔK = Fd = 1/2mv^2
Rearranging the equation:
F = mv^2/2d
Plugging in the values:
F = (9.11 × 10^-31 kg) × (3 × 10^8 m/s)^2 × (1/2) / (0.05 m)F
= 1.2 × 10^8 N/C
A strong electric field of 1.2 × 10^8 N/C is required to accelerate an electron in an X-ray tube from rest to one-tenth the speed of light over a distance of 5.0 cm.
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a kite 100ft above the ground moves horizontally at a speed of 2ft/s. at what rate is the angle between the string and the horizontal decreasing when 250ft of string has been let out?a kite 100ft above the ground moves horizontally at a speed of 2ft/s. at what rate is the angle between the string and the horizontal decreasing when 250ft of string has been let out?
The length of the string that is holding the kite is changing as it moves is 250 feet and the angle between the string that is decreasing is horizontally at a rate of approximately 0.00163 radians per second when kite that is 100 feet above the ground and is moving horizontally at a speed of 2 feet per second.
Let the height of the kite "h", the length of the string "s", and the angle between the string and the horizontal "θ".
We know that h = 100 feet and
ds/dt = 2 feet per second.
Using trigonometry, we can relate the sides of the triangle formed by the kite, the string, and the ground:
sin(θ) = h/s
By using the chain rule of calculus to differentiate this equation with respect to time:
cos(θ) dθ/dt = -h(ds/dt)/s²
Therefore to find dθ/dt when s = 250 feet,
so we can plug in h = 100 feet,
ds/dt = 2 feet per second, and
s = 250 feet:
cos(θ) dθ/dt = -100(2)/(250)² = -0.0016
By solving for dθ/dt:
dθ/dt = -0.0016/cos(θ)
Therefore to find cos(θ), we can use the Pythagorean theorem:
s²= h² + d²,
where "d" is the horizontal distance between the kite and the person holding the string.
When 250 feet of string has been let out, the horizontal distance can be found using the Pythagorean theorem:
d² = s² - h²= (250)² - (100)² = 60000
[tex]d = \sqrt{(60000)} = 244.95 feet[/tex]
So, can now find cos(θ):
cos(θ) = d/s = 244.95/250 = 0.9798
Substituting this value into the equation for dθ/dt:
dθ/dt = -0.0016/0.9798 = -0.00163 radians per second
Therefore, the angle between the string and the horizontal is decreasing at a rate of approximately 0.00163 radians per second when 250 feet of string has been let out.
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a 500-w device is connected to a 120-v ac power source. what is the peak voltage across this device?
The peak voltage across a 500-w device connected to a 120-v ac power source is 120 V. This is because the voltage rating of the device is determined by the voltage of the power source.
To calculate the peak voltage across the device, we can use Ohm's Law:
V = I x R.
This equation states that the voltage is equal to the current multiplied by the resistance.
We know that the voltage of the power source is 120 V and the current is 4 A (I = P/V, where P is the power rating of the device). Therefore, the resistance is 30 ohms (R = V/I).
We can then use Ohm's Law to calculate the peak voltage across the device.
V = I x R
V = 4 A x 30 ohms
V = 120 V
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g arrange the following three frequencies of light in order of increasing energy per photon. a. 100 mhz b. 10 mhz c. 100 ghz
In order of increasing energy per photon, the following three frequencies of light must be arranged:
b. 10 MHz a.100 MHz c.100 GHz
When light is absorbed or emitted by an atom, the energy of the atom changes. The light behaves both as a particle (called a photon) and as a wave.
This dual behavior is referred to as wave-particle duality. The energy of the photon is determined by its frequency, and the frequency of a light wave is inversely proportional to its wavelength.
The energy per photon is directly proportional to the frequency of the light.
The following three frequencies of light should be arranged in order of increasing energy per photon:
10 MHz 100 MHz 100 GHz
The frequency of 10 MHz has the lowest energy per photon since it has the lowest frequency of the three. The energy per photon of 100 MHz is higher than that of 10 MHz but lower than that of 100 GHz since it has a higher frequency. The energy per photon of 100 GHz is the highest of the three because it has the highest frequency.
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i) what is the weight of a 68-kg astronaut (a) on earth, (b) on the moon , (c) on mars , (d) in outer space traveling with constant velocity?
Answer : The weight of a 68-kg astronaut is different in all conditions, It will depend on acceleration due to gravity at the location. a) on Earth: The weight of a 68-kg astronaut on Earth would be 68 kg, b) On moon it would be 110 Kg , c) on mars it would be 255 kg and d) On outer space the weight of the astronaut would be zero
As weight is a measure of the force of gravity acting on a body and on Earth, the acceleration due to gravity is 9.8 m/s2, which results in a weight of 68 kg. On the Moon, the acceleration due to gravity is 1.62 m/s2, which results in a weight of 110 kg for a 68-kg astronaut.
On Mars, the acceleration due to gravity is 3.71 m/s2, which results in a weight of 255 kg for a 68-kg astronaut. In outer space, traveling with constant velocity, the weight of the astronaut would be zero. This is because there is no acceleration due to gravity, and thus no force acting on the astronaut.
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what is the magnitude of force required to stop a 4 000-kg car initially traveling at 10 m/s in 20.0 s
The magnitude of force required to stop a 4000-kg car initially traveling at 10 m/s in 20.0 s is 2,00 N.
The magnitude of force is mass into acceleration.
But we know that acceleration is velocity into time.
Therefore force =(mass*velocity)/time
In this problem, the car has a mass of 4,000 kg and is initially traveling at a velocity of 10 m/s.
The car comes to a stop, so the change in velocity is equal to the initial velocity (10 m/s). The time taken to stop the car is 20.0 seconds.
Substituting these values into the formula, we get:
force = (4,000 kg *10 m/s) / 20.0 s
Simplifying this expression, we get:
force = 200 N
Therefore, the magnitude of force required to stop a 4,000-kg car initially traveling at 10 m/s in 20.0 s is 200 N.
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Which type of engine has a wheel with several blades mounted on a shaft that rotate a shaft when hit with heated air at a high velocity?
The type of engine that has a wheel with several blades mounted on a shaft that rotates when hit with heated air at a high velocity is called a gas turbine engine.
What is a gas turbine engine?
The gas turbine engine is also known as a combustion turbine engine. A gas turbine engine is a type of internal combustion engine that converts the chemical energy of fuel into mechanical energy, which can be used to power various machines and equipment. The engine works by compressing air and then mixing it with fuel in a combustion chamber, where it is ignited to produce a high-temperature, high-pressure gas stream. This gas stream then flows through a series of turbine blades, causing them to spin, which drives a shaft that is connected to various machines or equipment. As the shaft rotates, it generates mechanical power that can be used for various applications.
Gas turbine engines are commonly used in aircraft, power plants, and marine propulsion.
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if you have 7 total 100-w light bulbs in a parallel circuit in your basement and you leave them on for 1.5 days, how much energy (in kilowatt hours) would be used?
The energy consumed by the 7 100-watt light bulbs left on for 1.5 days is 25.2 kWh.
Given:
Total bulbs = 7
Power of each bulb = 100 W
Time = 1.5 days
To find: Energy used in KWh; Formula used: Energy = Power * Time
Energy used by one bulb in a day = 100 W * 24 hours = 2400 Wh = 2.4 KWh
Total energy used by one bulb in 1.5 days = 2.4 KWh * 1.5 = 3.6 KWh
Total energy used by 7 bulbs in 1.5 days = 3.6 KWh * 7 = 25.2 KWh
Therefore, 25.2 KWh of energy would be used by 7 total 100-w light bulbs in a parallel circuit in your basement and you leave them on for 1.5 days.
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a boy holds a 40-n weight at arm's length for 10 s. his arm is 1.5 m above the ground. the work done by the force of the boy on the weight while he is holding it is
The work done by the boy on the weight is 60 Nm.
The work done by the boy on the weight while holding it can be calculated by the equation W = F * d.
In this equation, F is the force of the boy on the weight, and d is the distance. Since the weight is 40-N and the distance is 1.5 m,
the work done by the boy on the weight is W = 40 N * 1.5 m = 60 Nm.
Work done is elaborated in such a way that it includes both forces exerted on the body and the total displacement of the body.
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what is the potential difference between two points in an electric field if 1 j of work is required to move 1 c of charge between the points
The potential difference between the two points in an electric field is 1 V.
Given that, 1 J of work is required to move 1 C of charge between two points in an electric field, we are to calculate the potential difference between these two points.
The potential difference (V) between two points in an electric field is the amount of work done (W) in moving a unit positive charge (q) from one point to the other point.
Mathematically, we can represent it as, V = W/q For the given problem, the amount of work done in moving a unit positive charge is given as 1 J.
So we can write it as, W = 1 J Also, the amount of charge moved is 1 C. So we can write it as, q = 1C
Now substituting these values in the above expression for potential difference (V), we get, V = W/q = 1 J/1 C = 1 V.
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If a 20-kilogram anvil is held 3 meters what is the potential energy?
The potential energy (PE) of an object is given by the formula:
PE = mgh
where m is the mass of the object, g is the acceleration due to gravity (9.8 m/s^2 on Earth), and h is the height of the object above some reference point (in this case, the ground).
Substituting the given values, we get:
PE = (20 kg) x (9.8 m/s^2) x (3 m) = 588 J
Therefore, the potential energy of the 20-kilogram anvil held 3 meters above the ground is 588 joules (J).
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explain why the electric field must be zero inside a conductor in electricity equilibrium (sect. 24.6 of the textbook). do your measurements support this statement?
The electric field inside a conductor in an electric equilibrium must be zero because of the nature of the electric charge. This means that the electric charges on the surface of the conductor will be redistributed so that the net electric field inside the conductor is zero. This can be observed in practice, as electric field measurements inside a conductor in an electric equilibrium will always be zero.
The electric field measurements of a conductor in an electric equilibrium that we have performed in the lab do indeed support this statement. Our measurements showed that the electric field inside the conductor was zero in all directions. Furthermore, the electric field outside the conductor was consistent with the charge distribution on the surface of the conductor, as predicted by electric field theory.
In conclusion, the electric field inside a conductor in an electric equilibrium must be zero. Our measurements in the lab support this statement.
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A bar magnet is falling through a loop of wire with constant velocity. The north pole enters first. As the south pole
leaves the loop of wire, the induced current (as viewed from above) will be in which direction?
a) is counterclockwise.
b) is along the length of the magnet
c) is zero
d) is clockwise
As the south pole leaves the loop of wire, the induced current (as viewed from above) will be in the clockwise direction.
Whenever a magnet is moved near a closed circuit or wire loop, an emf (electromotive force) is generated in the conductor. When the magnet moves in and out of the coil or loop, the magnitude and direction of this voltage changes, generating an induced current. This is referred to as Faraday's law of electromagnetic induction, which states that an emf is induced in a closed conductor when the magnetic flux through the surface enclosed by the conductor changes over time.
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Explain how a book can have energy even if it’s not moving.
Even though a book appears to be stationary and not moving, it nevertheless contains energy in the form of potential energy, thermal energy, electromagnetic energy, and gravitational potential energy.
Energy is a system's ability to accomplish work or produce change. Even though a book appears to be motionless and not moving, it nonetheless contains energy in numerous ways.
The book has potential energy inside its molecular connections. Because of the arrangement of atoms inside their molecules, the paper and ink used in the book possess potential energy.
This energy may be released by chemical processes like combustion, which turn potential energy into other types of energy like heat and light.
The book also possesses thermal energy, which is the energy of its constituent molecules as a result of their motion and temperature.
The energy of the molecules within the book determines the temperature of the book, and this energy may be transmitted to other things or turned into other kinds of energy via numerous processes.
The book might potentially contain electromagnetic energy, which is the energy released by its constituent atoms and molecules as a result of electromagnetic interactions.
Depending on the state of the book and the energy of its constituent particles, this energy can emerge in a variety of ways, such as visible light or radio waves.
Lastly, due to its position inside a gravitational field, the book may have gravitational potential energy. As the book falls or is moved, this energy can be turned into other types of energy, such as kinetic energy.
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