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74. The volume rate of flow is
R
=
vA
where
A
=
π
r
2
and
r
=
d
/2. Solving for speed, we
obtain
22
4
.
(/
2
)
R
RR
v
Ad
d
ππ
==
=
(a) With
R
= 7.0
×
10
–3
m
3
/s and
d
= 14
×
10
–3
m, our formula yields
v
= 45 m/s, which is
about 13% of the speed of sound (which we establish by setting up a ratio:
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 Spring '08
 Any
 Physics

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