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Course Home sa MasteringPhysics:HW-Ch07 × CSecure https://session.masteringphysics.com/myct/itemView?assignmentProblemID-85815823&offset; next HW-ChoZItem 2 Resources « previous 2 of 10 | next s Item 2 Part A The food calone, equal to 4186 J, is a measure of how much energy is released when food is metabolized by the body. A certain brand of fruit-and-cereal bar contains 160 food calories per bar If a 65.0 kg hiker eats one of these bars, how high a mountain must he climb to "work off the calories, assuming that all the food energy goes only into increasing gravitational potential energy? Submit My Answers Give Up Part B If, as is typical only 20 0 % of the food calories go into mechanical energy, what would be the answer to part a ? Note: In this and all other problems, we are assuming that 100 % ofthe food calories that are eaten are absorbed and used by the body. This is actually not true. A person's "metabolic efficiency" is the percentage of calories eaten that are actualy used; the rest are eliminated by the body. Metabolic eftciency varies considerably from person to person) Submit My Answers Give Up

Explanation / Answer

Energy given by bar=160×4186J=669760J

Mgh=669760

h=669760/9.8×65=1051.428m=1.051km

20% of 669760=133952

Mgh=133952

h=133952/9.8×65=210.286m=0.21km

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