The density of a substance is the mass per unit volume. The mass of the metal bar is 3.95 kg.
The density of a substance is the mass per unit volume.
It can be given as,
[tex]\rho=\dfrac{m}{v}[/tex]
Here, [tex]m[/tex] is the mass of the substance and [tex]v[/tex] is the volume of hte substance.
Given information
A metal bar has the D of 7.9 g/mL .
Volume of the bar is 500 mili liter.
Suppose the mass of the metal bar is [tex]m[/tex] grams. Thus put the values in the above formula as,
[tex]\rho=\dfrac{m}{v}\\7.9=\dfrac{m}{500}\\[/tex]
Solve for m,
[tex]m=500\times7.9\\m=3950[/tex]
Thus the mass of the metal bar is 3950 grams. Convert it into the kg as divide by 1000. Thus,
[tex]m=\dfrac{3950}{1000}\\m=3.950[/tex]
Hence the mass of the metal bar is 3.95 kg.
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