- #1

karush

Gold Member

MHB

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$V=\frac{4}{3}\pi{r}^{3}$ of a sphere when the radius changes from $r_0$ to $r_0+dr$

$$dV=4\pi{r}_{0}^{2}dr$$

this was one of the selections but I didn't know how to account for the

$r_0$ to $r_0+dr$