Question

A metallic block of density $5gmc{m}^{-3}$ having dimensions $5cm\times 5cm\times 5cm$ is weighed in water. Its apparent weight will be:-

• A. $4\times 5\times 5\times 5gf$
• B. $4\times 4\times 4\times 4gf$
• C. $5\times 4\times 4\times 4gf$
• D. $5\times 5\times 5\times 5gf$

Answer 1

The correct option is A $4\times 5\times 5\times 5gf$

$4\times 5\times 5\times 5gf$

apparent weight = weight in air$[1-\frac{1}{\sigma }]$

$=V\rho g[1-\frac{1}{\sigma }]$

$=125\times 5\times 9.8[1-\frac{1}{5}]$

$=4.9N$

or

$4\times 5\times 5\times 5$ for relative density