Question

lead has greater density than iron and both are denser than water is the buoyant force on a lead object greater than ,less than or equal to the buoyant force on an iron object of same volume?why?

Answer 1

Buoyant force is given by the product of volume of the immersed body (or the volume of liquid displaced), density of the liquid and the acceleration due to gravity.

Now, when an iron object and a lead object of same volume are immersed in water, the volume of water displaced in both cases will be same. Thus, the buoyant force will be equal in both cases.