dP=m*g-pж*g*V=p*V*g-pж*g*V=V*g(p-pж) V=dP/g*(p-pж)=0,0196/10*(7800-800)=2,8*10^-7 м3
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dP=m*g-pж*g*V=p*V*g-pж*g*V=V*g(p-pж) V=dP/g*(p-pж)=0,0196/10*(7800-800)=2,8*10^-7 м3