guo (rg27533) – HW1 – ditmire – (58216)
1
This
printout
should
have
21
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0 points
A certain corner of a room is selected as the
origin of a rectangular coordinate system.
If a fly is crawling on an adjacent wall at a
point having coordinates (6
.
1 m
,
7
.
7 m), what
is the distance of the fly from the corner of
the room?
Answer in units of m.
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
] =
T
2
·
L
2
M
2.
[
C
] =
T
M
3.
[
C
] =
M
L
3
4.
[
C
] =
T
·
L
2
M
5.
[
C
] =
T
2
·
L
M
6.
[
C
] =
M
T
2
·
L
2
7.
[
C
] =
T
·
L
M
8.
[
C
] =
M
L
2
9.
[
C
] =
M
T
10.
[
C
] =
M
T
·
L
2
003
10.0 points
Consider a cube of soft, spongy material.
Which piece below has the larger density?
1.
cutting out a piece of the cube that has
oneeighth the volume
2.
Densities are the same.
3.
Unable to determine
4.
compressing the cube until it has one
eighth the volume
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.
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 Spring '08
 Turner
 Physics, Cartesian Coordinate System, Work, positive x axis

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