The radius of a spherical balloon is increasing at the rate 5cm per minute at the instant the balloon is 20cm in diameter. At what rate is air being pumped into the balloon? V = (4/3)(pi)(r^3)

Answer 1

dV/dt = 4πr²dr/dt = 4π·10²cm²·5cm/min = 2000π cm³/min = 6283.2 cm³/min