Problem 80E

80. Air is being pumped into a spherical weather balloon. At any time $t$, the volume of the balloon is $V(t)$ and its radius is $r(t)$

(a) What do the derivatives $d V / d r$ and $d V / d t$ represent?

(b) Express $d V / d t$ in terms of $d r / d t$

 

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