JAMB - Physics (1978 - No. 13)
A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because
the tension in the string decreases as the solid is lifted
the mass of the solid has increased
the solid apparently weighs less when completely immersed in water than when partially immersed
part of the solid still in water is exerting more force on the string
the solid is no longer in equilibrium with water