First slide

Fluid statics

Question

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?

Easy

A

$\frac{1}{3}$
B

$\frac{2}{3}$
C

$\frac{12}{13}$
D

$\frac{13}{15}$

Solution

$\frac{σ}{ρ_{w}} = \frac{15}{15 - 12} . \frac{σ}{ρ_{1}} = \frac{15}{15 - 13}$
$\Rightarrow \frac{ρ_{l}}{ρ_{w}} = \frac{2}{3}$

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