Problem 11.36 A 75 kg human sprinter can accelerate from rest to 10 m/s in 3.5 s

Question

Problem 11.36 A 75 kg human sprinter can accelerate from rest to 10 m/s in 3.5 s. During the same time interval, a 29 kg greyhound can go from rest to 20 m/s. Part A What is the average power output of the human? Average power over a time interval At is AE/At Express your answer to two significant figures and include the appropriate units. Value Units My Answers Give U Submit Part B What is the average power output of the greyhound? Express your answer to two significant figures and include the appropriate units. HA Value Units

Explanation / Answer

a) the change in kinetic energy human
= 0.5 * 75 * 10^2 -0
= 3750 J --answer

average power output
= 3750 / 3
= 1250 W --answer

and
b)the change in kinetic greyhound
= 0.5 * 29 * 20^2 -0
= 5800 J --answer

average power output
= 5800 / 3
= 1933.33 W --answer

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