7.
REASONING
The centripetal acceleration is given by Equation 5.2 as
a
c
=
v
2
/
r
.
The value of the radius
r
is given, so to determine
a
c
we need information about the
speed
v
.
But the speed is related to the period
T
by
v
= (2
π
r
)/
T
, according to
Equation 5.1.
We can substitute this expression for the speed into Equation 5.2 and
see that
a
v
r
rT
r
r
T
c
==
=
2
2
2
2
2
4
/
b
g
SOLUTION
To use the expression obtained in the reasoning, we need a value for
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 Spring '08
 SOFFER

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