Question

A 54.0-kg woman stands at the western rim of a horizontal turntable having a moment of inertia of 490 kg · m² and a radius of 2.00 m. The turntable is initially at rest and is free to rotate about a frictionless, vertical axle through its center. The woman then starts walking around the rim clockwise (as viewed from above the system) at a constant speed of 1.50 m/s relative to the Earth. Consider the woman–turntable system as motion begins.

(a) Is the mechanical energy of the system constant?

Yes/No

(b) Is the momentum of the system constant?

Yes/No

(c) Is the angular momentum of the system constant?

Yes/No

(d) In what direction and with what angular speed does the turntable rotate?

Magnitude: ___ rad/s

Direction: Clockwise/Counterclockwise

(e) How much chemical energy does the woman's body convert into mechanical energy of the woman–turntable system as the woman sets herself and the turntable into motion?
___ J

Answer 1