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At how many rpm must the disk turn to raise the elevator at 35.0 cm/s
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At how many rpm must the disk turn to raise the elevator at 35.0 cm/s

User Offbyone
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Let R be the radius of the disk, in centimeters. 35.0 cm/s = 35.0 * 60 cm/min = 2100 cm/min. One revolution of the disk is 2*pi*R, in cm. So the number of revolutions per minute is 2100 / (2*pi*R) = 1050/(pi*R), approximately 334/R.
User Carl Russmann
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