The mass of an alloy of copper and lead is 320 gm and the total volume is 30cc . Find the volume of each metal . Specific gravity of copper =8.89 and that of lead =11.37.

A piec of wax of volume 22 cc floats in water with 2 cc above the surface . Find the weight and specific gravity of wax.

Find the quantity of electricity needed to plate a metal of 100 cm^2 area and 10^-2cm thickness using CuSO_4 solution. (density of copper = 9.94 gm//cm^3 and atomic mass = 63.5)

A copper wire 2 m long and having a diameter of 2mm is suspended from a rigid support . The wire is stretched by a load of 5 kg . Find the work done in stretching the wire and the strain energy per unit of its volume. Y = 12 xx 10^10 N/m^2 and g= 9.8 m/s^2 .