Posted by May on Wednesday, March 9, 2011 at 11:01am.
V=L*W*H=0.02*0.02*0.02 = 8*10^-6m^3.
m=8*10^-6m^3*998.2kg/m^3=7.986*10^-3kg.
W=mg=7.986*10^-3kg * 9.8N/kg =0.078N.
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