3. REASONINGSince the tip of the blade moves on a circular path, it experiences a centripetal acceleration whose magnitude acis given by Equation 5.2 as, 2c/avr=, where vis the speed of blade tip and ris the radius of the circular path. The radius is known, and the speed can be obtained by dividing the distance that the tip travels by the time tof travel. Since an angle of 90°corresponds to one fourth of the
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