A piece of brass of volume 30cm3 has a mass of 252g.find the density o

1.	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» 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: $\dashrightarrow\: \sf\ 0.252/0.00003$ $\dashrightarrow\: \underline{\boxed{\tt{8400kg/m^3}}}$ $\rule{180}3$