1、W有用=Gh=50000N×30m=1500000J
W总=W有用/η=1500000J/0.6=2500000J
t=1min=60s
p= W总/t=2500000J/60s=约41667w
2、n=G/Fη=360N/(100N×0.8)=4.5(股)取5股
至少2定滑轮 2动滑轮
实际拉力:F=G/nη=360N/(5×0.8)=90N
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