prob_003 (2) - 3. REASONING Since the tip of the blade...

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3. REASONING Since the tip of the blade moves on a circular path, it experiences a centripetal acceleration whose magnitude a c is given by Equation 5.2 as, 2 c / av r = , where v is the speed of blade tip and r is 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 t of travel. Since an angle of 90 ° corresponds to one fourth of the
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