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HippoCampus Physics 9 Online
OpenStudy (anonymous):

In 1953 Sir Edmund Hillary and Tenzing Norgay made the first successful ascent of Mt. Everest.How many slices of bread did each climber have to eat to compensate for the increase of the gravitational potential energy of the system climbers-Earth? (One piece of bread releases about 1.0×106J of energy in the body.) Assume that the height of Mt. Everest is 8850 m, the weight of a person is about 80kg , and efficiency in converting the body’'s chemical energy into mechanical work is 11 %

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