Question

On a part-time job, you are asked to bring a cylindrical iron rod (RD = 7.8) of length 85.8 cm and diameter 2.85 cm from a storage room to a machinist. A) Calculate the mass of the rod expressed in kilogram. B) Will you need a cart?

Answer 1

Solution;

(A)

$\rho=\frac MV$

Density of iron;

$\rho=7.8g/cm^3$

Volume of the rod;

$V=\frac{πd^2}{4}×L$

$V=\frac{π×2.85^2}{4}×85.8$ =$547.35cm^3$

$M=\rho×V$

$M=547.35×7.8=4269.34g$

$M=4.269kg$

(B)

No.

The mass of the rod is relatively small.