1 、在空气中用弹簧测力计测得某石块重为5N,浸没在水中称量。弹簧测力计的示数为2N,求石块的密度是多少???(g=10N/kg)
2、有一木块,放入水中静止时有四分之一的体积露在水面上,若将它放入另一种液体中,有五分之三的体积浸入液体中,求液体的密度???
还是不太明白啊。物理又学得不好···唉······················································· 不会啊···怎么办啊······················································································································································