Phoenix Business Daily

what is the rotational inertia of a disk?

A uniform disk with a mass of 3.5 kg and a radius of 0.15 m is rotating with a rotational velocity of 9 rad/s. (a) What is the rotational inertia of the disk? (b) What is the angular momentum of the disk?

Public Comments

1. You need to integrate across the radius of the disc.
2. (a) J = 1/2*m*r**2 = 1/2*3.5*(1.5)**2 = 3.9375 kg*m**2 (b) H = J*w = 3.9375*9.0 = 35.4375 kg*(m/s)**2