The outer edge of the grooved area of a long-playing record is at a radial dista

Question

The outer edge of the grooved area of a long-playing record is at a radial distance40cm from the center; the inner edge is at a radial distance of13cm. The record rotates at3.6rev/min. The needle of the pick-up arm takes2.8minutes to move uniformly from the outer edge to the inner edge.
What is the radial speed of the needle?m/s
What is the speed of the outer edge relative to the needle?m/s
What is the speed of the inner edge relative to the needle?m/s
Suppose the phonograph is turned off, and the record uniformly and stops rotating after 10 s. What is the angular acceleration?rad/s2

Correct?

Explanation / Answer

1) 5.78 m/s 2)

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