222(/).effggvR=+Then, since frequency is the reciprocal of the period, Eq. 15-28 leads to fgLgvRLeff==+1212242ππ.With v= 70 m/s, R= 50m, and L= 0.20 m, we have 13.5 s3.5 Hz.f−≈=88. Since the centripetal acceleration is horizontal and Earth’s gravitational
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