Density and mass of the solid block is 5.2 kg/m3 and 2 kg.Find its volume?
A balloon filled with hydrogen has a volume of 1 m3 and its mass is 1 kg.The volume of the block of a very light material which it can just lift is
[Density of material of block is 91.3 kg/m3 and that of air is 1.3 kg/m3]