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Why do we need gravitational energy?
Gravitational potential energy stored in the water reserved in a dam becomes useful to generate electricity.
Name one situation in which gravitational potential might be useful and name one where it might be dangerous?
Bad- falling off a building
Total energy input equals equals the useful energy output plus?
Efficiency = ( useful energy output / total energy input ) x 100
What does the term efficient mean?
if you mean in terms of energy then it refers to a device that transfers more useful energy than it wastes if you mean in terms of energy then it refers to a device that transfers more useful energy than it wastes
How much power is applied if a person weighing 400 newtons climbs a five meter pole in 40 seconds?
The net output of useful work is (weight) times (gain in height) = 2,000 newton-meters = 2,000 joules.The rate of doing the work, and adding to his gravitational potential energy,is (2,000/40) = 50 joules per second = 50 watts.He certainly had to generate and expend more power than that in order to accomplish the climb.But most of the energy he expended went into heating his muscles and the rest of his body.50 watts is the power that went into the useful part of hoisting his weight to a position of fivemeters higher than where he started.
