Question

A piece of brass of volume 30 cm ³ has a mass of 252 g . Find the density of brass in kg m‐3

Answer 1

Explanation:

mass M of the piece of brass = 252 g Volume of the piece of volume = 30\ cm^3

(i) density d = \frac{M}{V}

= \frac{252}{30}=8.4\ g\ cm^{-3}

since, M = 252g = 0.252 kg

V = 30\ cm^3

= 30\times10^{-6}\ m^{-3}

Density d = \frac{0.252\ kg}{30\times10^{-6}\ m^{-3}}=\frac{0.252\ kg}{30\times\frac{1}{1000000}m^{-3}}

=

\frac{0.252\times1000000\ kg}{30\ m^3}=\frac{25200}{3}kg\ m^{-3}\ =\ 8400\ kg\ m^{-3}