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222
(/)
.
eff
gg
v
R
=+
Then, since frequency is the reciprocal of the period, Eq. 1528 leads to
f
g
L
gv
R
L
eff
==
+
1
2
1
2
24
2
ππ
.
With
v
= 70 m/s,
R
= 50m, and
L
= 0.20 m, we have
1
3.5 s
3.5 Hz.
f
−
≈=
88. Since the centripetal acceleration is horizontal and Earth’s gravitational
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 Spring '08
 Any
 Physics, Acceleration

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