how many cubic inches of material are needed for a solid rubber ball with a diameter of 3 inches?
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Originally Posted by hamadouousmane how many cubic inches of material are needed for a solid rubber ball with a diameter of 3 inches? The volume of a sphere is $\displaystyle V=\frac{4}{3} \pi r^3$ $\displaystyle D=2r$ so $\displaystyle r=\frac{3}{2}in$ $\displaystyle V==\frac{4}{3} \pi \left( \frac{3}{2}in \right)^3=\frac{4 \pi}{3}\frac{27}{8}in^3 =\frac{9\pi}{2} in^3$
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