Find the area of the surface generated when the curve y = 2 √ x is revolved about the x-axis.
A spring has a natural length of 20 cm. If a 25-dyne force is required to keep it stretched to a length of 25 cm, how much work is required to stretch it from 24 cm to 30 cm
A cone-shaped water reservoir is 10 feet in diameter across the top and 12 feet deep. If the reservoir is filled to a depth of 10 feet, how much work is required to pump all the water to the top of the reservoir? Use p = 62.4 lb/ft3 .