Question

A cubical wooden block of side 10cm floats at the interface between oil and water with its lower face 2cm below the interface. if density of oil is 600 kgm-3 then the mass of the block is

Answer 1

$a = 10cm \\ vol. = {a}^{3} \\ = {10}^{3} = 1000 {cm}^{3} = 0.001 {m}^{3} \\ mass = density \times volume \\ = 600 \times \frac{1}{100} \\ = 6kg$