矿石在水中所受浮力F浮1=G-F1=4.9N-2.45N=2.45N
矿石体积为V石=V排=F浮1//(ρ水g)=2.45N/(1000kg/m3*9.8N/kg)=2.5×10^-4m3
矿石在煤油中所受浮力:F浮2==ρ油gV排2=800kg/m3*9.8N/kg*2.5×10^-4m3
=1.96N
矿石浸没在煤油中时,弹簧测力计的示数为:
F2=G-F浮2=4.9N-1.96N=2.94N
矿石在水中所受浮力F浮1=G-F1=4.9N-2.45N=2.45N
矿石体积为V石=V排=F浮1//(ρ水g)=2.45N/(1000kg/m3*9.8N/kg)=2.5×10^-4m3
矿石在煤油中所受浮力:F浮2==ρ油gV排2=800kg/m3*9.8N/kg*2.5×10^-4m3
=1.96N
矿石浸没在煤油中时,弹簧测力计的示数为:
F2=G-F浮2=4.9N-1.96N=2.94N