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A $64-$kg woman cheats on her diet and eats a $700-$Calorie $(700$ kcal $)$ jelly doughnut for breakfast.

$($a$)$ How many joules of energy are the equivalent of one jelly doughnut?

$-$ J

$($b$)$ How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is $15$ cm $.$

Your response is off by a multiple of ten. stairs

$($c$)$ If the human body is only $24\%$ efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast?

Your response differs from the correct answer by more than $10\%.$ Double check your calculations. stairs

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