Question

A piece of brass volume 30cm3 has a mass of
252 g. Find the density of brass in (i) g cm-3
,
(ii) kg m-3
.

Answer 1

Explanation:

Given, Mass M = 252 g

Volume V = 30 cm3

(i) Density d = M/V = 252/30 cm3

= 8.4 g cm-3

(ii) Since, M = 252 g = 0.252 kg

V = 30 cm3 = 30 × 10 -6 m3

Density d = 0.252 kg/(30 × 10 -6 m3 ) = 0.252 kg/30 × (1/1000000) m3

= (0.252 × 1000000 kg)/30 m3 = (25200/3) kg m-3

= 8400 kg m-3