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OpenStudy (anonymous):
An object is fixed to 40 cm string and rotates around at 55 rotations per minute. What is its speed?
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OpenStudy (kira_yamato):
Assuming uniform circular motion, Angular speed, ω = 55 rpm = 110 π rad/min Radius, r = 40 cm Speed = rω = 0.4 (110π) = 44π m/min = 11π/15 cm / sec
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