F2/F1=S2/S1
S2=F2*S1/F1=200*0.006/3000=0.0004(м^2)=4(см^2)
<span>F=15H архимедова 45 в воздухе 30 в воде</span>
M=50 кг F=50 H L=5 м h=0.4 м η=? Fтр=?
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η=Ап/Аз=m*g*h/(F*L)=50*10*0.4/(50*5)=0.8 (80%)
Fтр=F-m*g*sinα=F-m*g*h/L=50-50*10*0.4/5=10 H
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N=m/M
m=n*M
<span>m=50*17=850 г
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