8. Relative density

Calculate the relative density:
 
A metal bar of mass 39 \(g\) has a volume of 13 \(cm^3\). Find the relative density of the copper rod. 
 
[Note: Enter the answer with one decimal point].
 
Density of copper rod:  \(g/cm^3\)
 
Relative density:
 
The objects behaviour with water:
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