Q. The total weight of a piece of wood is 6 kg. In the floating state in water its $\frac{1}{3}$ part remains inside the water. On this floating solid, what maximum weight is to be put such that the whole of the piece of wood is to be drowned in the water?>

A) 12 kg
B) 10 kg
C) 14 kg
D) 15 kg
Explanation

(a) Given, $6g = \frac{V}{3} \times 10^{3} \times g$ …(i)
And $(6 + m)g = V \times 10^{3} \times g$ …(ii)
Dividing Eq.(ii) by Eq. (ii) by Eq. (i), we get
$\frac{6 + m}{6} = 3$
Or $m = 18 - 6 = 12$ kg

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.