Four seconds after a polisher is started from rest small tufts of fleece from along the ci...

Four seconds after a polisher is started from rest small tufts of fleece from along the circumference of the 10-in-diameter polishing pad are observed to fly free of the pad. If the polisher is started so that tile fleece along the circumstance undergoes a constant tangential acceleration of 12 ft/s2, determine (a) the speed υ of a tuft as it leaves the pad.(b) the magnitude of the force required to free the tuft if the average weight of a tuft is 60 × 10 -6 oz.