Question

u r given a solid iron ball of mass 15g & a hollow iron ball of volume 20cm³ & mass 15g.both r placed on the surfaceof water.which ball will sink.show calculation & give reason

Answer 1

Since iron has higher density than water, the solid ball will sink.

For hollow ball, volume = 20cm^3 
density = 15/20 g/cm^3 = 0.75 g/cm^3
Since the overall density of the iron ball is less than density of water, it will float