Question

Find the weight density of a block 7 in. x 5.5 in. x 9 in. that weighs 65 lb. Express your
answer to four decimal places.

Answer 1

The weight density 

$$\rho=\frac{m}{V}=\frac{65\:\rm lb}{7\times 5.5\times 9\:\rm in^3}=0.1876\:\rm lb/in^3$$