Torque on Supply Reel in Cassette Deck Playback

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Homework Statement


A magnetic tape is being played on a cassette deck The tension in the tape applies a torque to the supply reel. Assuming the tension remains constant during playback,discuss how this torque varies as the reel becomes empty.


Homework Equations





The Attempt at a Solution


the lever keep on changing?
 

Discussion

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How is torque defined and how do you think this will relate to the tape reel?