32. A 50-kg boy runs up the stairs to the top of the 200-m tall 18 Peaks Mountain in 8 minutes and 20 seconds. Which of the following values is closest to his average power output in horse power? (g = 10 m/s2 , 1 hp = 750 W)
(A)0.4
(B)0.3 
(C) 2.0
(D) 10.0 
(E) 50.0

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統計： A(0), B(7), C(0), D(0), E(0) #2993331

詳解 (共 1 筆)

#7295200
W = mgh = 50x10x200 = 100000J
P = W/t = 100000/ 500 = 200
功率 (hp) = 200/ 750= 0.267 hp
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