Ph 111
NAME __________________________________
December 8, 2008
Quiz 5
Class Average:
6.1/10
Please give your numerical answers to at least three significant figures. Please give the correct units (m/s, kg,
rad/s, hour, day, etc.) with each answer.
Problem 1.
An underwater vehicle is exploring a region of the Pacific Ocean.
The vehicle has a circular
observation window with area
A
= 0.04 m
2
.
If the force on the window is equal to 750,000 N, what is the depth
h
of the ocean at that point?
[The density of ocean water is 1040 kg/m
3
.]
The relations for pressure give
F
P
g
A
h
ρ
=
=
Solving for the depth
h,
we get
(
)
(
)(
)
(
)
2
3
750,000 N
1840 m
0.04 m
1040 kg/m
9.8 N/kg
F
h
A
g
ρ
=
=
=
h= 1840 m
Problem 2.
A water pipe having a 3.0 cm inside diameter carries water into the basement of a house at a speed
of 1.5 m/s.
The pipe then tapers to an inside diameter of 1.5 cm.
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 Fall '08
 Staff
 Thermodynamics, Heat, 3 cm, 0.04 M

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