Question

what is the mass of a metal sphere of radius 3.0cm if its density is 7.0g/cm cu. express your answer in kg

Answer 1

$density = \frac{mass}{volume} \\ 7 = \frac{m}{ \frac{4}{3}\pi( {3}^{3} ) } \\ m = \frac{4}{3} \times 7 \times \pi \times 27 \: gram \\ m = 4 \times 7 \times \pi \times 9 \times 0.001 \: kg$

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