A 62 kg woman cheats on her diet and eats a 605 calorie (605 kcal) jelly donut f

Question

A 62 kg woman cheats on her diet and eats a 605 calorie (605 kcal) jelly donut for breakfast. How many joules of energy are the equivalent of 1 jelly donut? How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly donut. Assume height of single stair is 15 cm. If the human body is only 26% efficient in converting the chemical energy to mechanical energy how many stairs must the woman climb to work off her breakfast? A 62 kg woman cheats on her diet and eats a 605 calorie (605 kcal) jelly donut for breakfast. How many joules of energy are the equivalent of 1 jelly donut? How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly donut. Assume height of single stair is 15 cm. If the human body is only 26% efficient in converting the chemical energy to mechanical energy how many stairs must the woman climb to work off her breakfast? How many joules of energy are the equivalent of 1 jelly donut? How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly donut. Assume height of single stair is 15 cm. If the human body is only 26% efficient in converting the chemical energy to mechanical energy how many stairs must the woman climb to work off her breakfast?

Explanation / Answer

a )

given mass = 62 kg = m

E = 605 X 103 cal

E = 2532530 J

b )

the work done is W = m g h

W = n m g h

n = W / m g h

n = 2532530 / 62 X 9.8 X 0.15

n = 27787.25 J

c )

n = 0.26 X W / m g h

n = 0.26 X 2532530 / 62 X 9.8 X 0.15

n = 7224.68 J

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