W=pt=200W*3600s=7.2*10^5J
W=Gh h=W/(mg)=(7.2*10^5J)/(60*9.8N)≈1224.5m
F=(1/2)(G+G')=(1/2)(940+160)=550N
η=[(W有)/(W总)]*100%
=[(Gh)/(F*2h)]*100%
=G/(2F)*100%
=940/1100*100%
≈85.5%
W=FS
=FVt
=550*1*10
=5500J
初二物理
Simone
发布于 2024-09-28 00:55:29
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