Question

If the specific gravity of copper is 8.91, it weighs:

A. 55.6 lb/ft^3
B. 238.8 lb/ft^3
C. 23.88 lb/ft^3
D. 556 lb/ft^3

Answer 1

Option D is the correct answer.

Answer 2

Option D is the correct answer.

Step-by-step explanation:

The specific gravity of copper is 8.91.

We have

`\frac{\texttt{Density of copper}}{\texttt{Density of water}}=8.91\\\\\texttt{Density of copper}=8.91* 1000kg/m^3=8910kg/m^3`

We also have

1 kg = 2.205 lb

1 m = 3.28 ft

Substituting

`\texttt{Density of copper}=8910kg/m^3=(8910* 2.205)/(3.28^3)=556.76lb/ft^3`

Option D is the correct answer.