Question

A solid disk of mass m₁ = 9 kg and radius R = 0.23 m is rotating with a constant angular velocity of ω = 39 rad/s. A thin rectangular rod with mass m₂ = 3.3 kg and length L = 2R = 0.46 m begins at rest above the disk and is dropped on the disk where it begins to spin with the disk.

6)

The rod took t = 5.4 s to accelerate to its final angular speed with the disk. What average torque was exerted on the rod by the disk?

Answer 1