A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque $\tau$ is applied,as shown.The cylinder
A)speeds up.
B)slows down.
C)precesses about a vertical axis.
D)precesses about a horizontal axis.
E)does none of these.

Question

A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque $\tau$ is applied,as shown.The cylinder 
A)speeds up. 
B)slows down. 
C)precesses about a vertical axis. 
D)precesses about a horizontal axis. 
E)does none of these.

Quizplus · Accepted Answer

The net torque applied is in the same direction as the angular velocity, so it will cause the cylinder to speed up according to the equation τ = Iα, where τ is the torque, I is the moment of inertia, and α is the angular acceleration. The cylinder will continue to spin counterclockwise about its longitudinal axis. The other options are not applicable since there is no torque applied about any other axis.

A Solid Cylinder Is Spinning Counterclockwise About a Longitudinal Axis τ\tauτ

A Solid Cylinder Is Spinning Counterclockwise About a Longitudinal Axis $\tau$