Question: 1. Water is being pumped into a vertical cylinder of radius 5 meters and height 20 meters at a rate of 3 meters3/min. How fast is the water level rising when the cylinder is half full?
2. The radius of a spherical balloon is increasing by 2 cm/sec. At what rate is air being blown into the balloon at the moment when the radius is 10 cm? Give units in your answer.