A block of wood floats on water with 1/4 th of its volume above the water surface. The density of the wooden block will be?
Take, density of water = 1 gcm−3.
let the volume of the block be V and density of wood be ρ.
The volume of the block above the surface= 14V
The volume of the immersed block (v) =V−14V= 34V
We know, Weight of the block = weight of water displaced by immersed part of the block.
i.e. V x ρ x g = 34V x 1 x g
ρ = 34 =0.75 gcm−3