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A solid disk of unknown mass ad known radius R is used as a pulley in a lab experiment, as shown.

A solid disk of unknown mass ad known radius R is used as a pulley in a lab experiment,
as shown. A small block of mass m is attached to a string, the other end of
which is attached to the pulley and wrapped around it several times. The block of
mass m is released from rest and takes a time t to fall the distance D to the floor.

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