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a 65-kg man goes on a hike and climbs 110m high hill. (a) What is the...

a 65-kg man goes on a hike and climbs 110m high hill. (a) What is the increase in the gravitational potential energy of the man? (b) Where does this energy come from? (c) The man's body is 20 percent efficient; that is, for every 20 J that are converted to mechnical energy, 100 J of chemical energy are expended, with 80 J going into thermal energy. How much chemical energy is expended by the man during the climb?

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