Question

An object of mass 26 kg floats in air and it is in equilibrium state. Air density is $1.3 \,kg/m^3$ . The volume of the object is :

• A. $26 \, m^3$
• B. $10 \, m^3$
• C. $20 \, m^3$
• D. $13 \, m^3$

Answer 1

Answer: (C)

$20 \, m^3$

Answer 2

Given, mass of object $(m)=26 \,kg$
Density of air $\left(\rho_{\text {air }}\right)=1.3 \,kg / m ^{3}$
The object is in equilibrium state.
So, $mg =\rho_{\text {air }}\, Vg$
$26g =1.3 Vg$
$V =\frac{26}{1.3}$
$V =20 \,m ^{3}$