A disk with mass m = 5.7 kg and radius R = 0.43 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.56 m from the rope and at a frequency f = 20 rev/s (with a direction shown by the arrow).

What is the magnitude of the angular momentum of the spinning disk?

Question

A disk with mass m = 5.7 kg and radius R = 0.43 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.56 m from the rope and at a frequency f = 20 rev/s (with a direction shown by the arrow).

What is the magnitude of the angular momentum of the spinning disk?

anonymous · Answer

Angular momentum (L)=I(moment of inertia of the disk about the vertical axis)*w(angular frequency)
I (for disk)=1/2mR^2
w=2$$\pi$$f