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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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 Spring '08
 SOFFER

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