Question

Find the mass 200steel spherical ball of radius 0.7cm when density of steel is7.95cm cube

Answer 1

Hi friend,
 volume of a steel ball with 0.7 radius= $\frac{4}{3} \pi r^{3}$
                                                          =$\frac{4}{3} X \frac{22}{7} X( \frac{7}{10} ) ^{3} = \frac{88}{3} X \frac{49}{1000} =1.437$
volume of 200 balls = 1.437x200 = 287.4 cm³
density= mass /volume
7.95= mass/287.4
mass= 7.95 X 287.4 = 2284.83