A pendulum consists of a rod with an aluminum disk attached, suspended from a pivot. First the pendulum is held at a \(30^{\circ}\) angle to the vertical and released so that it begins to swing. The disk passes between the poles of a powerful magnet on each swing (Figure P29.18a). Next a series of vertical slits are cut completely through the disk (Figure P29.18b). The pendulum is again held at a \(30^{\circ}\) angle and released, and the disk again passes between the magnet's poles on each swing. Describe the motion of the pendulum in each case and explain your answer. Ignore any frictional force exerted at the pivot.

Data from Figure P29.18

Transcribed Image Text:

(a) y N 30 S x (b)