4.
REASONING
The magnitude
a
c
of the car’s centripetal acceleration is given by
Equation 5.2 as
2
c
/
av
r
=
, where
v
is the speed of the car and
r
is the radius of the
track. The radius is
r
= 2.6
×
10
3
m. The speed can be obtained from Equation 5.1 as
the circumference (2
π
r
) of the track divided by the period
T
of the motion. The
period is the time for the car to go once around the track (
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 Spring '08
 SOFFER
 magnitude ac

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