A piece of brass of volume 30cm3 has a mass of 261g. Find the density of brass in S.I and C.G.S units.
Answers
mass M of the piece of brass = 252 g Volume of the piece of volume = 30\ cm^330 cm
3
(i) density d = \frac{M}{V}
V
M
= \frac{252}{30}=8.4\ g\ cm^{-3}
30
252
=8.4 g cm
−3
since, M = 252g = 0.252 kg
V = 30\ cm^330 cm
3
= 30\times10^{-6}\ m^{-3}30×10
−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}}
30×10
−6
m
−3
0.252 kg
=
30×
1000000
1
m
−3
0.252 kg
=
\frac{0.252\times1000000\ kg}{30\ m^3}=\frac{25200}{3}kg\ m^{-3}\ =\ 8400\ kg\ m^{-3}
30 m
3
0.252×1000000 kg
=
3
25200
kg m
−3
= 8400 kg m
−3
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