( Intro 1 figure ) A small metal cylinder rests on a circular turntable that is

Question

(Intro 1 figure) A small metal cylinder rests on a circular turntable that is rotating at a constant rate, as illustrated in the diagram.

Intro 1 figure

Part A

Which of the following sets of vectors best describes the velocity, acceleration, and net force acting on the cylinder at the point indicated in the diagram? (Part A figure)

a

b

c

d or

e

Let be the distance between the cylinder and the center of the turntable. Now assume that the cylinder is moved to a new location from the center of the turntable. Which of the following statements accurately describe the motion of the cylinder at the new location?

Check all that apply.

The speed of the cylinder has decreased.

The speed of the cylinder has increased.

The magnitude of the acceleration of the cylinder has decreased.

The magnitude of the acceleration of the cylinder has increased.

The speed and the acceleration of the cylinder have not changed.

a

b

c

d or

e

Explanation / Answer

answer : (e)

let R be the old radius and R_1 be the new radius

if R<R_1    the speed and acceleration are decreases

if R>R_1   the speed and acceleration of the cylinder are increases

If R=R_1 the speed and acceleration of the cylinder are not changed

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