Question

A plate of a certain oil weighs 40kN. Calculate the specific mass, weight density and specific gravity of the oil.

Answer 1

$Weight = 40\ kN\\ Volume = 5\ m³$

$\rho = \dfrac{40000/10\ kg}{5\ m³}= 800\ kg/m³$

(a) Specific mass;

$\gamma=\rho g\\ \gamma = 800× 10 = 8000\ N/m³$

(b) Weight density;

$D=\rho g\\ D = 800× 10 = 8000\ N/m³$

(c) Specific gravity;

$SG = \dfrac{\rho_{oil}}{\rho_{H_2O}}=\dfrac{800}{1000} = 0.8$