Question

A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center of the disk. The platform has a radius of 3.40 m and a rotational inertia of 464 kg·m² about the axis of rotation. A 68.9 kg student walks slowly from the rim of the platform toward the center. If the angular speed of the system is 1.48 rad/s when the student starts at the rim, what is the angular speed when she is 2.21 m from the center?

i dont know what I'm doing wrong I'm frustrated here's my attempt:

I₁=(1/3)m(3.4)² + I_given

I₂₌(1/3)m(2.21)² + I_given

I₁w_i=I₂w_f

w_f=(I₁w_i)/I₂

Answer 1

Thitial yo IStud entmR = (68.9 kg) (Sw) γ= &.al m 'is 464 6 ) 2 f 2.33 Yd/