Chapter 11, Problem 66PP

Figure 11.22 shows a demonstration gyroscope, consisting of a solid disk mounted on a shaft. The disk spins about the shaft on essentially frictionless bearings. The shaft is mounted on a stand so it’s free to pivot both horizontally and vertically. A weight at the far end of the shaft balances the disk, so in the configuration shown there’s no torque on the system. An arrowhead mounted on the disk end of the shaft indicates the direction of the disk’s angular velocity.

FIGURE 11.22 A gyroscope (Passage Problems 65–68)

If you push on the shaft between the arrowhead and the disk, pushing directly upward on the bottom of the shaft, the arrow-head end of the shaft will move

1. a. away from you (i.e., into the page).
2. b. toward you (i.e., out of the page).
3. c. downward.
4. d. upward.