Water is leaking out the bottom of a hemispherical tank of radius 8 feet at a rate of 4 cubic feet per hour. The tank was full at a certain time. How fast is the water level changing when its height h is 5 feet? Note: the volume of a segment of height h in a hemisphere of radius r is xh2[r (h [3)]. I' ..... The water level is changing at a rate of ftlhr when its height h is 5 feet. (Simplify your answer. Round to the nearest thousandth as needed.)