You are running up a flight of stairs. You have __. • gravitational potential en
ID: 1991598 • Letter: Y
Question
You are running up a flight of stairs. You have __.
• gravitational potential energy
• kinetic energy
• kinetic energy and gravitational potential energy.
The "discovery" of the law of conservation of energy was given to
• Joule.
• Einstein.
• Newton.
• Galileo.
A powerful machine does a lot of work in a __ amount of time.
• friction
• long
• rate
• gravity
• short
Points earned: 0 out of 1
Power is the __ at which work is done.
• gravity
• long
• short
• friction
• rate
Points earned: 0 out of 1
Which of the following actions results in NO work done?
• pushing an object along the floor against friction.
• lifting an object from the floor to a table.
• decreasing the speed of an object until it comes to rest.
• holding an object stationary above the floor.
Points earned: 0 out of 1
In the SI system, work has a unit of __ times meter, or joule.
Your response:
blank answer
Points earned: 0 out of 1
Which of the following is kinetic energy changing to gravitational energy?
• jumping into the air
• falling object
• rolling down a hill
• standing at the edge of a cliff
Points earned: 0 out of 1
If the force on an object is perpendicular to the __ of the object, then no work is done on the object.
Your response:
blank answer
Points earned: 0 out of 1
A block is pulled along a smooth, level floor causing the block to accelerate. The energy gained by the block is equal to the
• work done on the block.
• power developed by the block.
• distance the block is pulled.
• force applied to the block.
Points earned: 0 out of 1
When a force causes an object to come to a stop, that force does
• negative work.
• positive work.
• no work.
Points earned: 0 out of 1
An object has gravitational potential energy due to __.
• constant
• height
• vector
• scalar
• in motion
Points earned: 0 out of 1
As the speed of a bicycle moving along a level, horizontal road changes from 2 m/s to 4 m/s, the bicycle's gravitational potential energy
• remains the same.
• decreases.
• first increases then decreases.
• increases.
Points earned: 0 out of 1
How much gravitational potential energy did King Kong have at the top of the Empire State Building? King Kong had a mass of 25×106 kg. The Empire State Building is 381 m (1,250 feet) tall.
Which equation would you use to solve this problem?
• Fd
• Fv
• mgh
• (1/2)mv^2
• W/t
• mgh = (1/2)mv^2
Points earned: 0 out of 1
Which of the following is gravitational energy changing to kinetic energy?
• object thrown into the air
• jumping into the air
• rolling up a hill
• falling object
Points earned: 0 out of 1
As the time needed to run up a flight of stairs decreases, the amount of work done against gravity
• decreases then increases.
• increases then decreases.
• increases.
• decreases.
• remains the same.
Points earned: 0 out of 1
When an object is pushed or pulled, work is done against __.
• short
• gravity
• rate
• friction
• long
Points earned: 0 out of 1
Can work be done on a system if there is no motion?
• Yes, if an outside force is provided.
• No, since a system which is not moving has no energy.
• No, because of the way work is defined.
• Yes, since motion is only relative.
Points earned: 0 out of 1
How much kinetic energy did 93.9-kg Usain Bolt have when he broke the Olympic 100-m dash record with a speed of 10.25 m/s?
Which equation would you use to solve this problem?
• mgh
• (1/2)mv^2
• W/t
• Fv
• mgh = (1/2)mv^2
• Fd
Points earned: 0 out of 1
One elevator goes up a given height in 10 seconds while another elevator does the same work in 5 seconds. Compared to the power rating of the first elevator, the power rating of the second elevator is
• twice as great.
• the same.
• four times as great.
• one-half as great.
Points earned: 0 out of 1
1 horsepower =
• 746 watts
• 646 watts
• 546 watts
• 446 watts
Points earned: 0 out of 1
As an object falls freely toward the Earth, the loss in gravitational potential energy is equal to its
• gain in velocity.
• loss of height.
• gain in kinetic energy.
• loss of mass.
Points earned: 0 out of 1
With all your might, you lift a 50-kg box 2.0 m. How much work do you do holding the box at 2.0 m?
• less than 100 J, but more than 0 J
• 0 J
• 100 J
• more than 100 J.
Points earned: 0 out of 1
If the total work done on an object is zero, then the object's kinetic energy
• increases.
• is zero.
• remains the same.
• decreases.
Points earned: 0 out of 1
The work done to raise an object must result in an increase in the object's
• elastic potential energy.
• internal energy.
• kinetic energy.
• gravitational potential energy.
Points earned: 0 out of 1
Energy is never lost. Eventually all forms of energy become
• gravitational energy.
• elastic energy.
• kinetic energy.
• thermal energy.
Points earned: 0 out of 1
A student at the mall wants to go to a music shop on the 3rd floor of the mall. Stairs, escalator, or elevator...which one will do the least amount of work?
• escalator
• stairs
• elevator
• All three will do the same amount of work.
Points earned: 0 out of 1
An engine moves a motorboat at a constant speed of 15 m/s. If the water offers a resistance of 6000 N, what is the power rating of this engine?
Which equation would you use to solve this problem?
• mgh = (1/2)mv^2
• mgh
• Fv
• W/t
• Fd
• (1/2)mv^2
Points earned: 0 out of 1
The rate at which work is done is called __.
Your response:
blank answer
Points earned: 0 out of 1
As a bullet shot upward rises, the kinetic energy of the bullet
• decreases.
• increases.
• remains the same.
• first increases then decreases.
Points earned: 0 out of 1
You are walking through Lake Taylor's foyer. You have __.
• gravitational potential energy
• kinetic energy and gravitational potential energy.
• kinetic energy
Points earned: 0 out of 1
The total mechanical energy of a system
• is either all kinetic energy or all potential energy.
• is constant.
• can never be negative.
• is equally divided between kinetic energy and potential energy.
Points earned: 0 out of 1
As the power rating of a machine is increased, the time required for the machine to do work
• decreases then increases.
• increases then decreases.
• decreases.
• increases.
• remains the same.
Points earned: 0 out of 1
If you push twice as hard against the side of a building, the amount of work you do
• is cut in half.
• remains constant but not zero.
• doubles.
• remains constant at zero.
Points earned: 0 out of 1
Which of the following have the same unit?
1. work
2. power
3. kinetic energy
• 1 and 2
• 2 and 3
• 1 and 3
Points earned: 0 out of 1
As a simple pendulum swings from its lowest point to its highest point, the gravitational potential energy of the bob
• remains the same.
• increases.
• first increases then decreases.
• decreases.
Points earned: 0 out of 1
If the total work done on an object is positive, then the object's kinetic energy
• increases.
• remains the same.
• decreaes.
• is zero.
Points earned: 0 out of 1
An electric motor can do 10,000 J of work in 15 s. What is the power rating of the motor?
Which equation would you use to solve this problem?
• Fd
• (1/2)mv^2
• Fv
• mgh = (1/2)mv^2
• mgh
• W/t
Points earned: 0 out of 1
When something is conserved, that something remains __.
• vector
• height
• constant
• scalar
• in motion
Points earned: 0 out of 1
In 1985 in San Antonio, Texas, an entire hotel building was moved several blocks on thirty-six dollies. It took 284,200 N or force to move the building 352 m. How much work was done on the building?
Which equation would you use to solve this problem?
• Fv
• mgh
• W/t
• Fd
• mgh = (1/2)mv^2
• (1/2)mv^2
Points earned: 0 out of 1
As a ball falls freely toward the Earth, its kinetic energy
• remains the same.
• increases.
• decreases.
• first decrease and then decrease.
Points earned: 0 out of 1
As a sky diver falls to the ground,
• kinetic energy increases, gravitational energy decreases.
• kinetic energy stays constant.
• kinetic energy decreases, gravitational energy increases.
Points earned: 0 out of 1
A wrecking ball is swinging toward a brick wall. At what point in the swing should the ball make contact with the wall to make collision with the greatest speed?
• half way between the highest point and the lowest point
• it does not matter
• the highest point
• the lowest point
Points earned: 0 out of 1
A ball is thrown upward. As the ball rises, its gravitational potential energy will
• increase.
• decrease.
• first decrease then increase.
• remain the same.
Points earned: 0 out of 1
Allen pushes a box with a force of 10 N for a distance of 10 m. Bill lifts a 50 N box 2 m. Who did the most work?
• Allen
• Bill
• Both did the same amount of work.
Points earned: 0 out of 1
Which combination of units is equivalent to the unit for mechanical work?
• N / m
• m / N
• N x m
Points earned: 0 out of 1
Engine A can haul 100 N at a speed of 2 m/s. Engine B can haul 200 N at a speed of 1 m/s. Which engine has more power?
• Engine A
• Engine B
• Both develop the same amount of power.
Points earned: 0 out of 1
In physics, a __ that causes the displacement of an object does work on the object.
Your response:
blank answer
Points earned: 0 out of 1
Kinetic energy is energy associated with an object __.
• in motion
• height
• constant
• scalar
• vector
Points earned: 0 out of 1
__ energy is energy associated with an object's motion.
Your response:
blank answer
Points earned: 0 out of 1
A bowling ball and a baseball are dropped from the same height at the same time. After free-falling for a few seconds, the balls will have different
• speeds.
• kinetic energies.
• accelerations.
Points earned: 0 out of 1
When an object is lifted, work is done against __.
• gravity
• rate
• long
• short
• friction
Points earned: 0 out of 1
According to legend Isaac Newton “discovered” gravity when a 0.20 kg apple fell 7.0 m from a tree. How fast was it going when it hit Newton’s head?
Which equation would you use to solve this problem?
• Fd
• W/t
• (1/2)mv^2
• mgh = (1/2)mv^2
• Fv
• mgh
Which combination of units is equivalent to the unit for mechanical power?
• s / J
• J x s
• J / s
Explanation / Answer
Rate.....lifesaver. should be 100%
You are running up a flight of stairs. You have __.
• kinetic energy and gravitational potential energy.
(explanation: you are running, therefore you have kinetic energy. Also, you are going up stairs, therefore increasing your height and therefore potential energy)
The "discovery" of the law of conservation of energy was given to
• Newton.
A powerful machine does a lot of work in a __ amount of time.
• short
Power is the __ at which work is done.
• rate
Which of the following actions results in NO work done?
• holding an object stationary above the floor.
In the SI system, work has a unit of __ times meter, or joule.
Newton
Which of the following is kinetic energy changing to gravitational energy?
• jumping into the air
If the force on an object is perpendicular to the __ of the object, then no work is done on the object.
motion
A block is pulled along a smooth, level floor causing the block to accelerate. The energy gained by the block is equal to the
• work done on the block.
When a force causes an object to come to a stop, that force does
• negative work.
An object has gravitational potential energy due to __.
• height
As the speed of a bicycle moving along a level, horizontal road changes from 2 m/s to 4 m/s, the bicycle's gravitational potential energy
• remains the same.
How much gravitational potential energy did King Kong have at the top of the Empire State Building? King Kong had a mass of 25×106 kg. The Empire State Building is 381 m (1,250 feet) tall.
• mgh
One elevator goes up a given height in 10 seconds while another elevator does the same work in 5 seconds. Compared to the power rating of the first elevator, the power rating of the second elevator is
• twice as great.
1 horsepower =
• 746 watts
As an object falls freely toward the Earth, the loss in gravitational potential energy is equal to its
• loss of height.
With all your might, you lift a 50-kg box 2.0 m. How much work do you do holding the box at 2.0 m?
• 0 J
If the total work done on an object is zero, then the object's kinetic energy
• remains the same.
The work done to raise an object must result in an increase in the object's
• gravitational potential energy.
Energy is never lost. Eventually all forms of energy become
• thermal energy.
A student at the mall wants to go to a music shop on the 3rd floor of the mall. Stairs, escalator, or elevator...which one will do the least amount of work?
• All three will do the same amount of work.
An engine moves a motorboat at a constant speed of 15 m/s. If the water offers a resistance of 6000 N, what is the power rating of this engine?
• W/t
The rate at which work is done is called __.
power
As a bullet shot upward rises, the kinetic energy of the bullet
• decreases.
You are walking through Lake Taylor's foyer. You have __.
• kinetic energy
The total mechanical energy of a system
• is constant.
As the power rating of a machine is increased, the time required for the machine to do work
• decreases.
If you push twice as hard against the side of a building, the amount of work you do
• remains constant at zero.
Which of the following have the same unit?
• 1 and 3
As a simple pendulum swings from its lowest point to its highest point, the gravitational potential energy of the bob
• increases.
If the total work done on an object is positive, then the object's kinetic energy
• increases.
An electric motor can do 10,000 J of work in 15 s. What is the power rating of the motor?
• W/t
When something is conserved, that something remains __.
• constant
In 1985 in San Antonio, Texas, an entire hotel building was moved several blocks on thirty-six dollies. It took 284,200 N or force to move the building 352 m. How much work was done on the building?
• Fd
As a ball falls freely toward the Earth, its kinetic energy
• increases.
As a sky diver falls to the ground,
• kinetic energy increases, gravitational energy decreases.
A wrecking ball is swinging toward a brick wall. At what point in the swing should the ball make contact with the wall to make collision with the greatest speed?
• the lowest point
A ball is thrown upward. As the ball rises, its gravitational potential energy will
increase
Allen pushes a box with a force of 10 N for a distance of 10 m. Bill lifts a 50 N box 2 m. Who did the most work?
• Both did the same amount of work.
Which combination of units is equivalent to the unit for mechanical work?
• N x m
Engine A can haul 100 N at a speed of 2 m/s. Engine B can haul 200 N at a speed of 1 m/s. Which engine has more power?
• Both develop the same amount of power.
In physics, a __ that causes the displacement of an object does work on the object.
force
Kinetic energy is energy associated with an object __.
• in motion
__ energy is energy associated with an object's motion.
kinetic
A bowling ball and a baseball are dropped from the same height at the same time. After free-falling for a few seconds, the balls will have different
• speeds.
When an object is lifted, work is done against __.
• gravity
According to legend Isaac Newton “discovered” gravity when a 0.20 kg apple fell 7.0 m from a tree. How fast was it going when it hit Newton’s head?
• mgh = (1/2)mv^2
Which combination of units is equivalent to the unit for mechanical power?
• J / s
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