virani (sv2339) – HW 3 – moura – (58650)
1
This
printout
should
have
11
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0 points
Which of the following is a vector quantity?
1.
none of these
correct
2.
density
3.
mass
4.
speed
5.
temperature
Explanation:
A vector is a quantity with both magni
tude and direction.
Temperature, density,
and mass do not have direction, so they are
scalars rather than vectors. Speed, by defini
tion, is the magnitude of velocity (which is a
vector), so it is also a scalar.
Therefore the
correct choice is “none of these”.
002
10.0 points
When two vectors sum to zero, how must they
be related?
1.
Both magnitude and direction are the
same.
2.
The magnitudes are the same; the direc
tions are opposite.
correct
3.
The magnitudes are different; the direc
tions are opposite.
4.
The magnitudes are different; the direc
tions are the same.
5.
All are wrong.
Explanation:
The magnitudes are the same, and the di
rections are opposite.
003
10.0 points
Consider position [
x
] = L, time [
t
] = T, ve
locity [
v
] = L
/
T and acceleration [
a
] = L
/
T
2
.
Find the exponent
A
in the equation
v
=
a
2
t
A
x
1.
2
2.
4
3.
1
4.
3
correct
Explanation:
[
v
] = [
a
]
2
[
t
]
A
[
x
]
L
T
=
parenleftbigg
L
T
2
parenrightbigg
2
T
A
L
=
L
2
L
T
A

4
Equating exponents,
A

4 =

1
A
= 3
.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '08
 MODI
 Acceleration, Velocity, Correct Answer

Click to edit the document details