Question #56892

The outer edge of the grooved area of a long-playing record is at a radial distance 36 cm from the center; the inner edge is at a radial distance of 15 cm. The record rotates at 6.7 rev/min. The needle of the pick-up arm takes 2.3 minutes 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

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