You curl a 5.5-kg (12 lb) barbell that is hanging straight down in your hand up

Question

You curl a 5.5-kg (12 lb) barbell that is hanging straight down in your hand up to your shoulder.

A). Determine the average mechanical power of the lifting process. Suppose it takes 0.3 s to lift the barbell up.

B). If the body is 20% efficient at converting chemical energy into mechanical energy, how many times would you have to lift the barbell in order to burn enough calories to use up the energy absorbed by eating a 300-food-calorie dish of ice cream? Note: 1 food calorie = 1 kilocalorie = 4186 J.

Explanation / Answer

the answer for 2.) is actually 6659.74 but rounded according to the question is 4700, N= 4700

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