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Unformatted text preview: This equation shows that the change in the angular momentum dL that occurs in a time dt must point in the same direction as the torque vector. Since the torque is at right angle to L, it can not change the magnitude of L, but it can change its direction. The result is a rotation of the angular momentum vector around the z-axis. The precession angle d[phi] is related to the change in the angular momentum of the system: This shows that the precession velocity is equal to This equation shows that the faster the top spins the slower it precesses. In addition, the precession is zero if g = 0 m/s 2 and the precession is independent of the angle [theta]....
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- Fall '09