A 69-kg sprinter accelerates from rest to a speed of 11.0 m/s in 4.0 s. (a) Calc

Question

A 69-kg sprinter accelerates from rest to a speed of 11.0 m/s in 4.0 s. (a) Calculate the mechanical work done by the sprinter during this time. 4174.5 Correct: Your answer is correct. J (b) Calculate the average power the sprinter must generate. 1043.63 Correct: Your answer is correct. W (c) If the sprinter converts food energy to mechanical energy with an efficiency of 25%, at what average rate is he burning Calories? (d) What happens to the other 75% of the food energy being used?

I just need parts c and d. Thank you!

Explanation / Answer

c)

Average burning rate = 0.25*P= 0.25*1043.63 J/s = 260.91 J/s

1J= 0.239 calories

Average burning rate = 260.91 J/s = (260.91*0.239calories/s) = 62.36 calories/s

d)

Rest 75% of food energy is used for her body for metabolism.

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