Question

A certain block weighs 22 N in air. It weighs 17 N when immersed in water. When immersed in another liquid it weighs 18 N. Calculate the relative density of the block.

• A. 5
• B. 4.4
• C. 5.5
• D. 3

Answer 1

The correct option is B 4.4

Relative Density of the block

$=\frac{\text{weight of body}}{\text{weight of equal vol. of water}}$

$=\frac{\text{weight of body}}{\text{thrust from water}}$

$=\frac{W_{air}}{W_{air}-W_{water}}=\frac{22}{22-17}=\frac{22}{5}$

$=4.4$