From ohanian the outer edge of the grooved area of a, Ask an Expert

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(from Ohanian) The outer edge of the grooved area of a long-playing record is at a radial distance 35 cm from the center; the inner edge is at a radial distance of 17 cm. The record rotates at 3.8 rev/min. The needle of the pick-up arm takes 1.6 minutes to move uniformly from the outer edge to the inner edge.

What is the radial speed of the needle?

What is the speed of the outer edge relative to the needle?

What is the speed of the inner edge relative to the needle?

Suppose the phonograph is turned off, and the record uniformly and stops rotating after 10 s. What is the angular acceleration?

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