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解:从题的意思来说:
G = 800N牛G车轮= 200牛
(1)F =1/5(G+G轮)=1/5 x (800N+200N)=200N
(2)η= W with/W total =(G x h)/(F la x 5h)= G/5F la = 800N/1000n = 80%。
G = 800N牛G车轮= 200牛
(1)F =1/5(G+G轮)=1/5 x (800N+200N)=200N
(2)η= W with/W total =(G x h)/(F la x 5h)= G/5F la = 800N/1000n = 80%。