Question

A vessel with water is placed on a weighing pan and it reads $600g$. Now a ball of mass $40g$ and density $0.80g.c{m}^{-3}$ is sunk into the water with a pin of negligible volume, as shown in figure keeping it sunk. The weighting pan will show a reading:

• A. $600g$
• B. $550g$
• C. $650g$
• D. $632g$

Answer 1

Answer: (C)

$650g$

Volume of ball = $=\frac{40}{0.8}=50c{m}^3$
Down thrust on water $=50g$.
Therefore reading is $650g.$