Here are questions about human diet. (a) A typical candy bar provides 280 calories (one “food” or “large” calorie is equal to 4.2 × 103 joules). How many candy bars would you have to eat to replace...

Here are questions about human diet.

(a) A typical candy bar provides 280 calories (one “food” or “large” calorie is equal to 4.2 × 103 joules). How many

candy bars would you have to eat to replace the chemical energy you expend doing 100 sit-ups? Explain your work,

including any approximations or assumptions you make. (In a sit-up, you go from lying on your back to sitting up.)

(b) How many days of a diet of 2000 large calories are equivalent to the gravitational energy difference for you between

sea level and the top of Mount Everest, 8848 m above sea level? (However, the body is not anywhere near 100%

efficient in converting chemical energy into change in altitude. Also note that this is in addition to your basal

metabolism.)