ï¼1ï¼
G人=P1S
S=640/1.6*10^4=0.04m^2
Fæ=G人-P2S
=640-6000*0.04
=400N
η=GA/nFæ
GA=0.9*3*400=1080N
Gå¨=3*400-1080=120N
ï¼2ï¼
Fæ'=G人-0.5P2S
=640-0.5*3000*0.04
=580N
nFæ'+P液Sç©=GB+Gå¨
3*580+2000*0.09=GB+120
GB=1800N
ÏB=GB/VB=1800/10*0.3^3=6666.7kg/m^3
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