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April 20, 2014

Homework Help: physics

Posted by Annette on Monday, April 29, 2013 at 11:08am.

A 79-kg sprinter accelerates from rest to a speed of 11.0 m/s in 4.8 s.
(a) Calculate the mechanical work done by the sprinter during this time.
J

(b) Calculate the average power the sprinter must generate.
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?



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