Question 532298
A pulley of radius 12 cm turns at 7 rps. What is the linear velocity of the belt driving the pulley in meters per second?
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circumference of pulley=2πr=2π12=24π cm
at 7rps, linear velocity=7*24π cm/s 
or 7*24π cm/s*(m/100cm)=1.68π m/s
ans:
linear velocity of the belt driving the pulley=1.68π m/s