Question

A body of volume $100cc$ is immersed completely in water contained in a jar of weight $700$ grams. The weight of water and the jar will be

• A. $700g-wt$
• B. $800g-wt$
• C. $500g-wt$
• D. $100g-wt$

Answer 1

The correct option is B $800g-wt$

Weight of water and jar before immersion=$700gm$

Buoyant force acting on body upwards=$V\rho g=100cc\times 1g/cc\times g$

$=100gm$

The reaction pair of this force acts on the water downwards which adds to the weight of water and jar.

Hence the weight of water and jar becomes $700gm+100gm=800gm$