Question

A beaker containing water is placed on the platform of a spring balance. The balance reads 1.5 kg. A stone of mass 0.5 kg and density ${10}^{4}kg/m^3$ is immersed in water without touching the walls of the beaker. What will be the balance reading now?

• A. 2 kg
• B. 2.5 kg
• C. 1 kg
• D. 3 kg

Answer 1

The correct option is A 2 kg

Since the weight of the block must be equal to the buoyant force acting on the block for it to remain in equilibrium,

$B=0.5kg$

The reading of the spring balance = Weight of water + Buoyant force' reaction pair force downwards

$=1.5kg+0.5kg=2kg$