Term
| if you push for a half hour or a whole hour against a stationary wall.. |
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Definition
| no work on the wall is done in either case. |
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| if you push an object twice as far while applying the same force, you do.. |
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| if you find the twice as much work is needed to perform a task but it takes twice as much time, the amount of power required is... |
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| a job is done slowly, while an identical job is done quickly, both jobs require the same amount of work, bt different amounts of... |
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| if you do work on an object in one-third the usual time, your power output is... |
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Definition
| three times the usual power output |
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| do 100J of work in 50s and your power output is... |
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Term
| if an object is raised twice as high, its potential energy will be... |
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Term
| a 1000-kg car and a 2000-kg car are hoisted the same distance. raising the more massive car requires... |
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Term
| an object that has kinetic energy must be |
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| an object may have potential energy because of its... |
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| a clerk can lift containers a vertical distance of 1 meter or can roll them up 2 meter long ramp to the same elevation. with the ramp, the applied force required is about.... |
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Term
| when an automobile is braked to a stop, its kinetic energy is transformed to.. |
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Term
| a ball rolling down an incline has its maximum potential energy at... |
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Definition
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Term
| a ball rolling down an incline has its maximum kinetic energy at... |
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Term
| what task requires the most work, lifting a 50 kg sack 2 meters or lifting a 24 kg 4 meters? |
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Definition
| both require the sam amount of work. |
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Term
| a TV set is pushed a distance of 2 m with a force of 20 N. how much work is done on the set? |
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Definition
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Term
| it takes 40 J to push a large box 4 m across a floor. assuming the push is in the same direction as hte move, what is the magnitude of the force on the box? |
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Term
| a 2kg mass is held 4 meters above the ground. what is the approximate potential energy of the mass with respect to the ground? |
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| two identical arrows, one with twice the kinetic energy aof the other, are fired into a hay bale, the faster arrow will penetrate.... |
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Definition
| twice as far as the slower arrow. |
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Term
| a car moves 4 times as fast as another identical car,. compared to the slower car, the faster car has... |
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Term
| strictly speaking, more fuel is consumed by your car if an air conditionar, headlights, or even a radio is turned on. the statement is... |
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Term
| a machine puts out 100 watts of power for every 1000 watts put into it. the efficiency of the machine is.... |
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Term
| a car moving at 50 km/hr skids 20 m with locked breaks. how far will the car skid with locked breaks if it were traveling at 150 km/hr? |
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Term
| which has greater kinetic energy, a car traveling at 30 km/hr or a car of hlf the mass traveling at 60 km/hr? |
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| a driver who weighs 500 N steps off a dving board that is 10 m above the water. the diver hits the water with kinetic energy of... |
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