huynh (hph268) – Exam 1 Practice – clark – (56485)
1
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27
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001
10.0 points
Consider two identical metal bottles A and B
that can be used to hold compressed gases. A
is filled with air at atmospheric pressure, and
B is completely evacuated.
Which bottle is denser?
1.
A
2.
B
3.
Unable to determine
4.
Densities are the same.
002
10.0 points
When an object falls through air, there is
a drag force
(
with dimension M
·
L
/
T
2
)
that
depends on the product of the surface area of
the object and the square of its velocity;
i.e.
,
F
air
=
C A v
2
,
where
C
is a constant.
What is the dimension for constant
C
?
1.
[
C
] =
M
T
·
L
2
2.
[
C
] =
M
T
2
·
L
2
3.
[
C
] =
T
M
4.
[
C
] =
M
L
2
5.
[
C
] =
T
2
·
L
2
M
6.
[
C
] =
M
L
3
7.
[
C
] =
T
2
·
L
M
8.
[
C
] =
T
·
L
M
9.
[
C
] =
T
·
L
2
M
10.
[
C
] =
M
T
003
10.0 points
The average person burns up approximately
5 cals/min during exercise while gaining 100
cals from the post exercise snack. Dieticians
recommend 30 minutes of exercise and one
snack daily.
Using this information, provide an order of
magnitude estimate of the net caloric change
every day in all the healthconscious citizens
in a city like Austin (population 7
×
10
5
).
1.
10
4
kcals
2.
10 kcals
3.
−
10
4
kcals
4.
−
10 kcals
5.
−
10
7
kcals
6.
Cannot be estimated
7.
10
7
kcals
004
(part 1 of 3) 10.0 points
There are roughly 10
59
neutrons and protons
in an average star and about 10
11
stars in a
typical galaxy. Galaxies tend to form in clus
ters of (on the average) about 10
3
galaxies,
and there are about 10
9
clusters in the known
part of the Universe.
Approximately how many neutrons and
protons are there in the known Universe?
1.
n
≈
10
52
2.
n
≈
10
87
3.
n
≈
10
82
4.
None of these
5.
n
≈
10
47
6.
n
≈
10
43
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huynh (hph268) – Exam 1 Practice – clark – (56485)
2
005
(part 2 of 3) 10.0 points
Suppose
all
this
matter
were
compressed
into a sphere of nuclear matter such that
each nuclear particle occupied a volume of
1
.
401
×
10

45
m
3
(which is approximately the
“volume” of a neutron or proton).
What would be the radius of this sphere of
nuclear matter?
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 Spring '11
 Zao
 Velocity, Huynh

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