The food calorie, equal to 4186 J, is a measure of how...(help please!)? : Eco Answers

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Question by Plasticine: The food calorie, equal to 4186 J, is a measure of how…(help please!)?
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.

1.) 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?
h=_____m
2.) If, as is typical, only 25.0 \% 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 % of the 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 actually used; the rest are eliminated by the body. Metabolic efficiency varies considerably from person to person.)
h=____m

Best answer:

Answer by djh1960
1. Gravitational PE = mass x gravity x height

The energy would be 4186 x 160 = 670,000 J

670,000 = 65(9.8) h

h = 1051 m

2. h = 1051(25%/100) = 263 m

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The food calorie, equal to 4186 J, is a measure of how...(help please!)?

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