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4. If the radius of an abrasive stone is 0.24 m, calculate a) Linear or tangential velocity of a point on the periphery. b) tangential acceleration of a point on the periphery. c) radial acceleration of a point on the periphery, at the end of 2.7s. d) repeat for a point halfway between the center and the periphery, that is, at r=0.12m We measure rotation by using this reference line. Clockwise - negative Counterclockwise - positive Axis Zero angular position Reference line Fig. 10-8 A grindstone. Att = 0 the reference line (which we imagine to be marked on the stone) is horizontal