Section: Solid Mechanics | Marks: 1
A disk of mass g 25 .0 = m and radius mm 10 = r is at rest relative to a mass-less horizontal turntable spinning about a vertical axis at an angular speed of s/ rad 2 = ω . The turntable is assumed to be mounted on frictionless bearings. Another identical, initially non-rotating disk is dropped onto the spinning disk. Friction causes both disks (and the turntable) to eventually rotate at the same angular speed. The eventual angular speed of the disks is
- A. 0.15 rad/s
- B. 1 rad/s
- C. 2 rad/s
- D. 4 rad/s
Answer: B. 1 rad/s