Question

plz answer with explanation

Answer 1

Relative density is mostly done in relation to water which has 1000kg/m^3 density.
so in this case , 8.9*1000/1000=8.9
so relative density =8.9

Answer 2

Relative density= density of copper/ density of water at 4℃
= 8.9×10^3/ 1000
=8.9