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  4. A metallic block weighs 15 N in air. It weighs 12 N when immersed in water and 13 N when immersed in another liquid. What is the specific gravity of the liquid?

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Q. A metallic block weighs $15 N$ in air. It weighs $12 N$ when immersed in water and $13 N$ when immersed in another liquid. What is the specific gravity of the liquid?

Mechanical Properties of Fluids

Solution:

$\frac{\sigma}{\rho_{w}} = \frac{15}{15 - 12'}$
$\frac{\sigma}{\rho_{l}} = \frac{15}{15 - 13}$
$\Rightarrow \frac{\rho_{l}}{\rho_{w}} = \frac{2}{3}$