MATHEMATICS · Subjective · AP · Calculus AB · Applications of Integration · Applications of Integration
Problem
A region in the first quadrant is bounded by y=2x, y=x, and x=4. The region is revolved about the x-axis. Determine whether each perpendicular cross-section produced has an inner radius greater than zero, and state whether filled disks or hollow washers must be used to compute the volume. Give a brief reason for your choice.