Problem $5(1$ pt$).$ A spherical droplet evaporates from $30m$ to $20m$ in diameter in $1$ second. What is the rate of volume change, $d\frac{V}{d}t?$ Express volume in cubic centimeters per second, and

the rate of change should be negative. $($a$)$ sketch the situation. $($b$)$ set out the relevant equations and identify the missing variable. $($c$)$ decide what units to use and convert units $($c$)$ rearrange before plugging in numbers to solve.