Question

A piece of brass of volume 30cm3 has a mass of 252g.find the density of brass in g cm-3 and kg m-3 pls pls tell me the answer

Answer 1

Given :

$\dag\: \sf\ Volume of brass :- 30cm^3$

$\dag\: \sf\ Mass of brass :- 252 g$

To Find :

$\sf\ Density \:of\:brass\: in\: g/cm^3 and kg/m^3.$

Solution :

$\sf\ We\:are\:asked\:to\:find\:density:$

(a) g/cm^3

$\underline{\boxed{\tt{Density:- \frac{Mass}{Volume}.}}}$

$\dashrightarrow\: \sf\ D = M/V$

$\dashrightarrow\: \sf\ D = 252/30g/cm^3$

$\dashrightarrow\: \sf\ D = 25.2/3g/cm^3$

$\dashrightarrow\: \underline{\boxed{\tt{ D = 8.4g/cm^3}}}$

(b) kg/m^3

$\sf\ We\: convert\: the \:volume\:cubic\: metres.$

$\dashrightarrow\: \sf\ 1m^3=1000000cm^3$

$\dashrightarrow\: \sf\ 30/1000000\times1=0.00003m^3$

$\underline{\boxed{\tt{Density:- \frac{Mass}{Volume}.}}}$

Substituting we have:

$\dashrightarrow\: \sf\ 0.252/0.00003$

$\dashrightarrow\: \underline{\boxed{\tt{8400kg/m^3}}}$

$\rule{180}3$