Energy Smart

kmm4864990 asked:


That is, initially the rock has a high potential energy. Then, its energy is converted into kinetic energy as it falls. So i understand energy is merely changing form.

But then it hits the ground. The rock ceases moving at a relative height of zero. Into what form was the enrgy converted? Is it converted into kinetic enrgy that travels through the particles of the ground? Thanks a lot!

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blcklabelx asked:


At a carnival, you can try to ring a bell by striking a target with a 9.00-kg hammer. In response, a 0.400-kg metal piece is sent upward toward the bell, which is 5.00 m above. Suppose that 25.0% of the hammer’s kinetic energy is used to do the work of sending the metal piece upward. How fast must the hammer be moving when it strikes the target so that the bell just barely rings?

Please show your work with all formulas used. (conservation of energy formula I believe)
Show your answer in terms of the variables given and a numerical answer.

Thanks.

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