√53, 125 230.19 8. Water is being pumped into a conical tank that is 8 feet tall and has a diameter of 10 feet. If the water is being pumped in at a constant rate of cubic feet per hour, at what rate is the depth of the water in the tank changing when the tank is half full? 9. An acute angle of a right triangle increases at a constant rate of 3 radians per minute. If the hypotenuse is 5 cm, at what rate is the side opposite the acute angle increasing in centimeters per minute when the opposite side equals 3 cm? 10. A person 2 meters tall walks directly away from a streetlight that is 8 meters above the grou the person is walking at a constant rate and the person's shadow is lengthening at the rate of per second, at what rate, in meters per second, is the person walking?