A piece of iron weighs 230g and has a volume of `20cm^3`. Find the density of iron.

3.5 kg mass of a metal plate has the volume of 1.5m^(3) . Find the density of metal plate.

The mass of an iron sheet is 0.250 kg and volume of the sheet is 1.5m^(3) . Then what is the density of the iron sheet? Expres the result in SI unit system.

Find the mass of silver of volume 50 cm^3 and density 10.5g//cm^3 .

Two small iron particles, each of mass 280 mg, are. placed at a distance 10 cm apart. If 0.01% of the electron. of one particle are transferred to the other, find the. electric force between them. Atomic weifht of iron is 56 g mol^(-) and there are 26 electrons in each atom of iron.

A piece of solid weight 120 g in air, 80g in water & 60g in liquid find the relative density of solid & liquid.

A cubical block of wood weighing 200 g has a lead piece fastened underneath. Find the mass of the lead piece which will just allow the block of float in water. Specific gravity of wood is 0.8 and that of lead is 11.3.

The rate of increase of the volume of air in a baloon is 400 cm^(3)//s . Find the rate of increase of its radius, when its diameter is 20 cm

Find the ratio of the weights, as measured by a spring balance, of a 1 kg block of iron and a 1kg block of wood. Density of iron =7800 kg m^-3 density of wood =800 kg m^-3 and density of air =1.293 kgm^-3 .