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In which of the situations is NO work being done?
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
The amount of work being done on an object can be increased by
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
Potential energy is
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
A weightlifter presses a 400N weight 0.5m over his head in 2s. What is the power of the weightlifter?
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
_______ is defined as the rate at which work is done.
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
Which of the following has the greatest potential energy?
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
A man pushes a crate along a factory floor by exerting a force of 55N. If the crate moves a distance of 4m, how much work does the man perform?
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
Which of the following processes requires the most work?
a car parked at the top of a hill
All of the above.
A person lifts a 10kg weight 1m off the floor.
holding a box overhead
power
220J
increasing the distance the object is moved.
100W
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