神马作文网a cyclists coasts down a 6.6读hill at a steady sped of 8km/h.
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a cyclists coasts down a 6.6读hill at a steady sped of 8km/h.assuming a total mass of 75kg,what must the cyclist's power output to climb the same hill at the same speed?answer:p=375w
我先翻译一下题目：
一个骑脚踏车的人总质量为75kg,从一个6.6°倾斜的小山下以8km/h匀速下坡,如果该人要以同样的速度匀速上坡,则他做功的功率为多少?
answer ：下山重力做功功率 mgsinθV 摩擦力做功等于重力做功,重力做正功,摩擦力做负功,人不做功.
上山重力做负功,摩擦力做负功,人做正功.
人做功功率 P=2mgsinθV=2×75×10×sinθ×8×1000/3600=375w
一个骑脚踏车的人总质量为75kg,从一个6.6°倾斜的小山下以8km/h匀速下坡,如果该人要以同样的速度匀速上坡,则他做功的功率为多少?
answer ：下山重力做功功率 mgsinθV 摩擦力做功等于重力做功,重力做正功,摩擦力做负功,人不做功.
上山重力做负功,摩擦力做负功,人做正功.
人做功功率 P=2mgsinθV=2×75×10×sinθ×8×1000/3600=375w
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