A spinning wheel which is held up by one end of its axle will precess in the sense shown if it has that direction of spin. If the spin is reversed, it will precess in the opposite direction. The sense of precession is determined by the direction of the torque due to the weight of the spinning wheel.

In which direction does precession cause the disk to move?

In which direction does precession cause the disk to move? Direction: The tip of L moves in the direction of τ.

How do you find the precession angle?

The precessional angular velocity is given by ωP=rMgIω ω P = r M g I ω , where r is the distance from the pivot to the center of mass of the gyroscope, I is the moment of inertia of the gyroscope's spinning disk, M is its mass, and ω is the angular frequency of the gyroscope disk.