Assignment 1  Week 2
Due: 11:59pm on Friday, September 16, 2011
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15.9 Note this is seawater.
Problem 15.9
A research submarine has a 30.0
diameter window 8.10
thick. The manufacturer says the
window can withstand forces up to 1.00
×
10
6
. What is the submarine's maximum safe depth?
Part A
The pressure inside the submarine is maintained at 1.0 atm.
ANSWER:
1400
Correct
15.7 Assume that this is an open vat.
Problem 15.7
A 1.50
diameter vat of liquid is 2.90
deep. The pressure at the bottom of the vat is 1.30
.
Part A
What is the mass of the liquid in the vat?
ANSWER:
5480
Correct
15.32 This is a relatively short distance, so you can assume that the density of the air is constant.
Problem 15.32
A gymnasium is 14.0
high.
Part A
By what percent is the air pressure at the floor greater than the air pressure at the ceiling?
ANSWER:
0.175
%
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Pressure in the Ocean
The pressure at 10
below the surface of the ocean is about 2.00
×
10
5
.
Part A
Which of the following statements is true?
Hint A.1
How to approach the problem
Since pressure is defined as force per unit area, the pressure at a given depth below the
surface of the ocean is the normal force on a small area at that depth divided by that area.
Thus, given the pressure at 10
you can determine the normal force on a unit area at that
depth. Also recall that, in general, the pressure in a fluid varies with height, but it also depends
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 Winter '08
 BATES
 Physics

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