- #1

BrainMan

- 279

- 2

## Homework Statement

A woman whose mass is 70 kg stands at the rim of a horizontal turn table that has a moment of inertia of 500 kg * m/s and a radius of 2 m. The system is initially at rest, and the turntable is free to rotate about friction less vertical axle through its center. The woman starts walking clockwise around the rim at a constant speed of 1.5 m/s relative to the earth. (a) In what direction and with what angular speed does the turntable rotate? (b) How much work does the woman do to set the system into motion?

## Homework Equations

## The Attempt at a Solution

I am not sure how to approach this problem. I was going to try to use the conservation of angular momentum and find the momentum of just the girl walking in the circle. Then I was going to find the angular momentum including the turntable and solve for the angular velocity of the system. Unfortunately the problem gives her speed in m/s and I am not sure how to convert that to rad/sec.