You drop a ball from initial height and measure the height it bounces back to. F

Question

You drop a ball from initial height and measure the height it bounces back to. Find the faction of gravitational energy retrieved after the bounce. and the fraction of gravitational energy lost to thermal energy.
My intial height was 12inches and final height was 3 inches....I know I need to divide 3/12 = 0.25 but is this number the energy lost or retrieved? And then how do I find the other number.

My second question: you give off 575 W, how many 60 Wlightbulbs could you power? Which would be 9 lightbulbs. Would you be able to keep them running for very long?

I think the answer is no because you don't have a continual supply of power. But can someone verify this?

Explanation / Answer

1) number 0.25 corresponds to 3 inch height. This is the fraction of energy retrieved. Energy lost would be 1-0.25= 0.75 of the initial energy.

2) power is energy per unit time. 575W means you are supplying 575J of energy per second until the power supply is disconnected. Hence we will be able to keep them running for very long. So the answer should be yes instead of no.

Please ask if this is still not understood.

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