Question 1 5 pts For which of the following scenarios is no work done? A barbell

Question

Question 1 5 pts For which of the following scenarios is no work done?
A barbell is held overhead in place..
A barbell is lowered from overhead to the ground.
A barbell is lifted from the ground to overhead.
A barbell sits on the ground.


Question 2 5 pts 50000 J of work is done on a 1400 kg car by its brakes, bringing it to a stop in 7.90 m. To the nearest newton, what force does the brakes apply to the car?



Question 3 5 pts A 160 kg crate of bricks needs to be lifted from the ground level of a building under construction to its 10th story, a distance of 33.0 m. To the nearest kilojoule, how much work is required to lift the bricks?



Question 4 5 pts James Watt defined the to be approximately one-and-a-half times the average power output of a typical equine work animal; this is W in SI units.



Question 5 5 pts A Siberian husky has a power output of 100 W when pulling a sled. To the nearest kilojoule, how much work will the husky do in pulling the sled for 4 h?



Question 6 5 pts A 85 kg mountaineer climbs a mountain of height 4,000 m in a time of 21 h. To the nearest watt, what is the mountaineer’s average power output during the climb?



Question 7 5 pts energy is the energy an object has due to its motion. energy is the energy an object has due to its position. energy is the energy an object has due to its mass, as predicted by Einstein.



Question 8 5 pts To the nearest joule, what is the kinetic energy of a 0.00380 kg bullet fired at 360 m/s?



Question 9 5 pts To the nearest joule, what is the gravitational potential energy, relative to the Earth’s surface, of a 60.0 kg woman 12.0 m above the ground?



Question 10 5 pts A 1700 kg SUV sits at rest on the top of a 15 m high hill, as measured relative to Earth’s surface. The SUV then rolls down the hill to its bottom. To the nearest m/s, how fast will the SUV be moving at the bottom of the hill?



Question 11 5 pts A 0.150 kg baseball is pitched straight upward from rest by exerting a force of 48.0 N over a distance of 1.00 m before releasing the ball. To the nearest tenth of a m/s, what is the baseball’s speed as it leaves the pitcher’s hand?


Flag this Question Question 12 5 pts During a playoff game, a 0.160 kg baseball is popped straight up off a bat at 36.0 m/s. To the nearest tenth of a meter, how far above the bat will the ball be when it reaches its highest point in the air?



Question 13 5 pts The villainous Juggernaut has a mass of 860 kg and is running at 4.50 m/s to the east. Juggernaut's linear momentum would therefore be kg•m/s to the .



Question 14 5 pts An 800 kg cannon sits at rest, loaded with a 6.0 kg cannonball. When the cannon is fired horizontally, the exploding gunpowder accelerates the cannonball through the barrel, with the cannonball finally flying out of the barrel at a speed of 110.0 m/s toward the East. To 2 decimal places, what is the recoil speed of the cannon in m/s?



Question 15 5 pts A 46.0 kg boy is running at 4.3 m/s when he suddenly jumps onto a stationary 4.0 kg skateboard. To the nearest tenth of a meter per second, at what speed does the boy and skateboard move off at?



Question 16 5 pts Rank the following situations in terms of their angular momenta, from largest at top to smallest at bottom. Largest angular momentum [ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center"]   
[ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center"]    Smallest angular momentum [ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board"]   


Flag this Question Use this Energy Skate Park: BasicsHTML5 simulation to answer Questions 17 through 20 below! It can also be accessed at https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html (Links to an external site.) .




Question 17 5 pts Select "Intro" in the Energy Skate Park: Basics HTML5 simulation. You should see a U-shaped track with a skateboarder nearby. Check the "Pie Chart", "Bar Graph", "Grid", and "Speed" boxes. Leave the Mass slider in its default middle position. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), then release the skateboarder. Observe the motion of the skateboarder as she skates back and forth. Her potential energy is greatest at a height of [ Select ] ["6", "0", "2", "4"] m above the ground. Her kinetic energy is greatest at a height of [ Select ] ["0", "4", "2", "6"] m above the ground. Her potential and kinetic energies are equal at a height of [ Select ] ["1", "3", "5"] m above the ground.



Question 18 5 pts Continue to use the settings from the previous question for "Intro" in the Energy Skate Park: Basics HTML5 simulation. For this question, switch the track to the "w" shaped track by clicking on the bottom of the three images of tracks. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of about 5 m), release the skateboarder, then observe the motion of the skateboarder as she skates back and forth. Lower the starting point of the skateboarder gradually. In order to clear the hump in the middle, the lowest height she can be released from is [ Select ] ["2", "1", "4", "3"] m because [ Select ] ["her total energy is constant.", "her kinetic energy is constant.", "her potential energy is constant."] .



Question 19 5 pts Select "Friction" in the Energy Skate Park: Basics HTML5 simulation. You should see a U-shaped track with a skateboarder nearby. Check the "Pie Chart", "Bar Graph", "Grid", and "Speed" boxes. Leave the Mass and Friction sliders in their default middle positions. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), then release the skateboarder. Observe the motion of the skateboarder as she skates back and forth. Which of the following statements best describes what eventually happens to the skateboarder?
She comes to a stop at the top of the track because all of her kinetic energy is converted to thermal energy.
She comes to a stop at the bottom of the track because all of her kinetic and potential energy are converted to thermal energy.
She comes to a stop at the top of the track because all of her energy is lost.
She comes to a stop at the bottom of the track because all of her energy is lost.


Question 20 5 pts Continue to use the settings from the previous question for "Friction" in the Energy Skate Park: Basics HTML5 simulation. For this question, switch the track to the "L" shaped track by clicking on the middle of the three images of tracks. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), release the skateboarder, then observe the motion of the skateboarder. By the time she hits the end of the track, about [ Select ] ["25", "67", "13", "50"] % of the skateboarder's energy is "lost" as thermal energy, so that her top speed is [ Select ] ["equal to", "less than", "greater than"] her top speed without friction.








Question 1 5 pts For which of the following scenarios is no work done?
A barbell is held overhead in place..
A barbell is lowered from overhead to the ground.
A barbell is lifted from the ground to overhead.
A barbell sits on the ground.


Question 2 5 pts 50000 J of work is done on a 1400 kg car by its brakes, bringing it to a stop in 7.90 m. To the nearest newton, what force does the brakes apply to the car?



Question 3 5 pts A 160 kg crate of bricks needs to be lifted from the ground level of a building under construction to its 10th story, a distance of 33.0 m. To the nearest kilojoule, how much work is required to lift the bricks?



Question 4 5 pts James Watt defined the to be approximately one-and-a-half times the average power output of a typical equine work animal; this is W in SI units.



Question 5 5 pts A Siberian husky has a power output of 100 W when pulling a sled. To the nearest kilojoule, how much work will the husky do in pulling the sled for 4 h?



Question 6 5 pts A 85 kg mountaineer climbs a mountain of height 4,000 m in a time of 21 h. To the nearest watt, what is the mountaineer’s average power output during the climb?



Question 7 5 pts energy is the energy an object has due to its motion. energy is the energy an object has due to its position. energy is the energy an object has due to its mass, as predicted by Einstein.



Question 8 5 pts To the nearest joule, what is the kinetic energy of a 0.00380 kg bullet fired at 360 m/s?



Question 9 5 pts To the nearest joule, what is the gravitational potential energy, relative to the Earth’s surface, of a 60.0 kg woman 12.0 m above the ground?



Question 10 5 pts A 1700 kg SUV sits at rest on the top of a 15 m high hill, as measured relative to Earth’s surface. The SUV then rolls down the hill to its bottom. To the nearest m/s, how fast will the SUV be moving at the bottom of the hill?



Question 11 5 pts A 0.150 kg baseball is pitched straight upward from rest by exerting a force of 48.0 N over a distance of 1.00 m before releasing the ball. To the nearest tenth of a m/s, what is the baseball’s speed as it leaves the pitcher’s hand?


Flag this Question Question 12 5 pts During a playoff game, a 0.160 kg baseball is popped straight up off a bat at 36.0 m/s. To the nearest tenth of a meter, how far above the bat will the ball be when it reaches its highest point in the air?



Question 13 5 pts The villainous Juggernaut has a mass of 860 kg and is running at 4.50 m/s to the east. Juggernaut's linear momentum would therefore be kg•m/s to the .



Question 14 5 pts An 800 kg cannon sits at rest, loaded with a 6.0 kg cannonball. When the cannon is fired horizontally, the exploding gunpowder accelerates the cannonball through the barrel, with the cannonball finally flying out of the barrel at a speed of 110.0 m/s toward the East. To 2 decimal places, what is the recoil speed of the cannon in m/s?



Question 15 5 pts A 46.0 kg boy is running at 4.3 m/s when he suddenly jumps onto a stationary 4.0 kg skateboard. To the nearest tenth of a meter per second, at what speed does the boy and skateboard move off at?



Question 16 5 pts Rank the following situations in terms of their angular momenta, from largest at top to smallest at bottom. Largest angular momentum [ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center"]   
[ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center"]    Smallest angular momentum [ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board"]   


Flag this Question Use this Energy Skate Park: BasicsHTML5 simulation to answer Questions 17 through 20 below! It can also be accessed at https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html (Links to an external site.) .




Question 17 5 pts Select "Intro" in the Energy Skate Park: Basics HTML5 simulation. You should see a U-shaped track with a skateboarder nearby. Check the "Pie Chart", "Bar Graph", "Grid", and "Speed" boxes. Leave the Mass slider in its default middle position. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), then release the skateboarder. Observe the motion of the skateboarder as she skates back and forth. Her potential energy is greatest at a height of [ Select ] ["6", "0", "2", "4"] m above the ground. Her kinetic energy is greatest at a height of [ Select ] ["0", "4", "2", "6"] m above the ground. Her potential and kinetic energies are equal at a height of [ Select ] ["1", "3", "5"] m above the ground.



Question 18 5 pts Continue to use the settings from the previous question for "Intro" in the Energy Skate Park: Basics HTML5 simulation. For this question, switch the track to the "w" shaped track by clicking on the bottom of the three images of tracks. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of about 5 m), release the skateboarder, then observe the motion of the skateboarder as she skates back and forth. Lower the starting point of the skateboarder gradually. In order to clear the hump in the middle, the lowest height she can be released from is [ Select ] ["2", "1", "4", "3"] m because [ Select ] ["her total energy is constant.", "her kinetic energy is constant.", "her potential energy is constant."] .



Question 19 5 pts Select "Friction" in the Energy Skate Park: Basics HTML5 simulation. You should see a U-shaped track with a skateboarder nearby. Check the "Pie Chart", "Bar Graph", "Grid", and "Speed" boxes. Leave the Mass and Friction sliders in their default middle positions. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), then release the skateboarder. Observe the motion of the skateboarder as she skates back and forth. Which of the following statements best describes what eventually happens to the skateboarder?
She comes to a stop at the top of the track because all of her kinetic energy is converted to thermal energy.
She comes to a stop at the bottom of the track because all of her kinetic and potential energy are converted to thermal energy.
She comes to a stop at the top of the track because all of her energy is lost.
She comes to a stop at the bottom of the track because all of her energy is lost.


Question 20 5 pts Continue to use the settings from the previous question for "Friction" in the Energy Skate Park: Basics HTML5 simulation. For this question, switch the track to the "L" shaped track by clicking on the middle of the three images of tracks. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), release the skateboarder, then observe the motion of the skateboarder. By the time she hits the end of the track, about [ Select ] ["25", "67", "13", "50"] % of the skateboarder's energy is "lost" as thermal energy, so that her top speed is [ Select ] ["equal to", "less than", "greater than"] her top speed without friction.








Question 1 5 pts For which of the following scenarios is no work done?
A barbell is held overhead in place..
A barbell is lowered from overhead to the ground.
A barbell is lifted from the ground to overhead.
A barbell sits on the ground.


Question 2 5 pts 50000 J of work is done on a 1400 kg car by its brakes, bringing it to a stop in 7.90 m. To the nearest newton, what force does the brakes apply to the car?



Question 3 5 pts A 160 kg crate of bricks needs to be lifted from the ground level of a building under construction to its 10th story, a distance of 33.0 m. To the nearest kilojoule, how much work is required to lift the bricks?



Question 4 5 pts James Watt defined the to be approximately one-and-a-half times the average power output of a typical equine work animal; this is W in SI units.



Question 5 5 pts A Siberian husky has a power output of 100 W when pulling a sled. To the nearest kilojoule, how much work will the husky do in pulling the sled for 4 h?



Question 6 5 pts A 85 kg mountaineer climbs a mountain of height 4,000 m in a time of 21 h. To the nearest watt, what is the mountaineer’s average power output during the climb?



Question 7 5 pts energy is the energy an object has due to its motion. energy is the energy an object has due to its position. energy is the energy an object has due to its mass, as predicted by Einstein.



Question 8 5 pts To the nearest joule, what is the kinetic energy of a 0.00380 kg bullet fired at 360 m/s?



Question 9 5 pts To the nearest joule, what is the gravitational potential energy, relative to the Earth’s surface, of a 60.0 kg woman 12.0 m above the ground?



Question 10 5 pts A 1700 kg SUV sits at rest on the top of a 15 m high hill, as measured relative to Earth’s surface. The SUV then rolls down the hill to its bottom. To the nearest m/s, how fast will the SUV be moving at the bottom of the hill?



Question 11 5 pts A 0.150 kg baseball is pitched straight upward from rest by exerting a force of 48.0 N over a distance of 1.00 m before releasing the ball. To the nearest tenth of a m/s, what is the baseball’s speed as it leaves the pitcher’s hand?


Flag this Question Question 12 5 pts During a playoff game, a 0.160 kg baseball is popped straight up off a bat at 36.0 m/s. To the nearest tenth of a meter, how far above the bat will the ball be when it reaches its highest point in the air?



Question 13 5 pts The villainous Juggernaut has a mass of 860 kg and is running at 4.50 m/s to the east. Juggernaut's linear momentum would therefore be kg•m/s to the .



Question 14 5 pts An 800 kg cannon sits at rest, loaded with a 6.0 kg cannonball. When the cannon is fired horizontally, the exploding gunpowder accelerates the cannonball through the barrel, with the cannonball finally flying out of the barrel at a speed of 110.0 m/s toward the East. To 2 decimal places, what is the recoil speed of the cannon in m/s?



Question 15 5 pts A 46.0 kg boy is running at 4.3 m/s when he suddenly jumps onto a stationary 4.0 kg skateboard. To the nearest tenth of a meter per second, at what speed does the boy and skateboard move off at?



Question 16 5 pts Rank the following situations in terms of their angular momenta, from largest at top to smallest at bottom. Largest angular momentum [ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center"]   
[ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center"]    Smallest angular momentum [ Select ] ["a playground merry-go-round making 20 rotations per minute while loaded with 8 kids hanging onto its edge", "a playground merry-go-round making 20 rotations per minute while loaded with 8 kids standing at its center", "a playground merry-go-round making 20 rotations per minute while loaded with no kids on board"]   


Flag this Question Use this Energy Skate Park: BasicsHTML5 simulation to answer Questions 17 through 20 below! It can also be accessed at https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html (Links to an external site.) .




Question 17 5 pts Select "Intro" in the Energy Skate Park: Basics HTML5 simulation. You should see a U-shaped track with a skateboarder nearby. Check the "Pie Chart", "Bar Graph", "Grid", and "Speed" boxes. Leave the Mass slider in its default middle position. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), then release the skateboarder. Observe the motion of the skateboarder as she skates back and forth. Her potential energy is greatest at a height of [ Select ] ["6", "0", "2", "4"] m above the ground. Her kinetic energy is greatest at a height of [ Select ] ["0", "4", "2", "6"] m above the ground. Her potential and kinetic energies are equal at a height of [ Select ] ["1", "3", "5"] m above the ground.



Question 18 5 pts Continue to use the settings from the previous question for "Intro" in the Energy Skate Park: Basics HTML5 simulation. For this question, switch the track to the "w" shaped track by clicking on the bottom of the three images of tracks. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of about 5 m), release the skateboarder, then observe the motion of the skateboarder as she skates back and forth. Lower the starting point of the skateboarder gradually. In order to clear the hump in the middle, the lowest height she can be released from is [ Select ] ["2", "1", "4", "3"] m because [ Select ] ["her total energy is constant.", "her kinetic energy is constant.", "her potential energy is constant."] .



Question 19 5 pts Select "Friction" in the Energy Skate Park: Basics HTML5 simulation. You should see a U-shaped track with a skateboarder nearby. Check the "Pie Chart", "Bar Graph", "Grid", and "Speed" boxes. Leave the Mass and Friction sliders in their default middle positions. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), then release the skateboarder. Observe the motion of the skateboarder as she skates back and forth. Which of the following statements best describes what eventually happens to the skateboarder?
She comes to a stop at the top of the track because all of her kinetic energy is converted to thermal energy.
She comes to a stop at the bottom of the track because all of her kinetic and potential energy are converted to thermal energy.
She comes to a stop at the top of the track because all of her energy is lost.
She comes to a stop at the bottom of the track because all of her energy is lost.


Question 20 5 pts Continue to use the settings from the previous question for "Friction" in the Energy Skate Park: Basics HTML5 simulation. For this question, switch the track to the "L" shaped track by clicking on the middle of the three images of tracks. Drag and drop the skateboarder to the highest point on the left side (the red dot underneath the skateboarder should be right at a height of 6 m), release the skateboarder, then observe the motion of the skateboarder. By the time she hits the end of the track, about [ Select ] ["25", "67", "13", "50"] % of the skateboarder's energy is "lost" as thermal energy, so that her top speed is [ Select ] ["equal to", "less than", "greater than"] her top speed without friction.

Explanation / Answer

Asnwer 1:

As we know that, work done is depend upon force and displacement, so for no work done there should be zero displacement that is sitting on the ground represents zero displacement. Hence, option D is correct.

Answer 2:

As given in the question, work = 5000 J, Mass = 1400 kg, and displacement (s) = 7.90 m

And w= F*s

putting the values in above equatio we get foce,

F= 5000/7.90= 632.911 N

Answer 3:

As mass of body is given the question = 160 kg , S= 33m

And the work done = - change in potential energy

w= - m*g * displacement

by putting given values in above equation we get,

w= -160* 9.8* 33 = -51744 J

Asnwer 4:

The relation between power and work are power = work / time

and the SI unit of power is watt, which can be also be written as Joule per second

Answer 5:

Power = 100 W. Time = 4 hour (14400 seconds)

Work = power * time

By putting the given values in above equation we get,

W= 100*14400= 1440000 joule= 1440 Kilojoule

Answer 6:

As Power = work / time --- equation 1

And work = Force * displacement

Force= mass * g= 85* 9.8= 833 N

S=4000 m

t= 21 hour( 75600seconds)

Now put the values in equation 1, we get

P= 833* 4000/ 75600= 44.07 W

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