Question

A large plate is balanced at its center and two students of equal mass stand at its center. The plate is rotated on a frictionless pivot about an axis through its center and perpendicular to its face. The students then begin to walk out towards opposite edges. (Select T-True, F-False, I-Increases, D-Decreases, S-Stays the same. ). A) The students produce no net torque on the plate. B) The rate of rotation ... as the students walk outward. C) The students do no work in walking outward. D) The total angular momentum of the system ... as the students walk outward. E) When the students reach the edge and stop, the plate will have the same angular speed as when they started.

Answer 1

1)The students produce a net torque on the plate--True

2)The rate of rotation ... as the students walk outward

decreases ,as the mass gets awy from axis of rotation,it decreases

3)The students do no work in walking outward

False.it does work ,since student exert force on plate hence the work is done

4)The total angular momentum of the system ... as the students walk outward.

Stays the same ...since angular momentum is conserved

5)When the students reach the edge and stop, the plate will have the same angular speed as when they started.

False,since the plate slows down as it moves