lenoir (wml297) – oldhomework 03 – Turner – (58220)
1
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printout
should
have
12
questions.
Multiplechoice questions may continue on
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before answering.
001
(part 1 of 2) 10.0 points
A physics book is moved once around the
perimeter of a table of dimensions 1 m by 3
m.
If the book ends up at its initial position,
what is the magnitude of its displacement?
1.
5 m
2.
8 m
3.
2 m
4.
1 m
5.
6 m
6.
3 m
7.
7 m
8.
4 m
9.
0 m
correct
10.
None of these
Explanation:
Since its final position is the same as its
initial position, the displacement is 0.
002
(part 2 of 2) 10.0 points
What is the distance traveled?
1.
6 m
2.
3 m
3.
4 m
4.
7 m
5.
5 m
6.
1 m
7.
8 m
correct
8.
0 m
9.
None of these
10.
2 m
Explanation:
The distance traveled is the perimeter of
the table:
d
= 2
ℓ
+ 2
w
= 2 (1 m) + 2 (3 m)
= 8 m
.
003
10.0 points
Ann is driving down a street at 62 km
/
h.
Suddenly a child runs into the street.
If it takes Ann 0
.
738 s to react and apply
the brakes, how far will she have moved before
she begins to slow down?
Correct answer: 12
.
71 m.
Explanation:
Let :
v
= 62 km
/
h
and
t
= 0
.
738 s
.
d
=
v t
= (62 km
/
h) (0
.
738 s)
1 h
3600 s
1000 m
1 km
=
12
.
71 m
.
004
(part 1 of 4) 10.0 points
The following 4 questions refer to a toy car
which can move to the right or left along a
horizontal line.
The positive direction is to
the right.
Choose the correct velocitytime graph for
each of the following questions. Assume fric
tion is so small that it can be ignored.
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lenoir (wml297) – oldhomework 03 – Turner – (58220)
2
car
v
g
O
+
Which velocity graph shows the car moving
toward the right (away from the origin) at a
steady (constant) velocity?
1.
t
v
correct
2.
t
v
3.
None of these graphs is correct.
4.
t
v
5.
t
v
6.
t
v
7.
t
v
8.
t
v
9.
t
v
10.
t
v
Explanation:
Since the velocity is constant, the graph is
a straight line. Since the car is moving to the
right the velocity is positive.
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 Spring '10
 Turner
 Velocity, Correct Answer, Orders of magnitude, m/s, Lenoir

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