1
PH 131
Exam 1
Fall 2006
Student Name____________________________________________________
Student Number__________________________________________________
Lab/Recitation Section Number______________________________(11,…,36)
Instructions:
1.
Provide all of the information requested above. Write your name at the top of
each
page.
2.
Clearly indicate your answers for all multiplechoice questions in the space provided.
3.
Present neat and orderly solutions to each problem, clearly indicating your method of
solution.
You must document the equations used in each part and show how they are
manipulated to arrive at your solution.
Correct answers without a documented
solution will receive zero credit.
Final answers should be circled or boxed.
4.
Be sure to include appropriate units with all answers.
5.
Neglect the effect of air resistance in all questions.
Figures are not drawn to scale.
Multiple Choice________
Problem 1_____________
Problem 2_____________
Total
_________________
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2
Multiple Choice
(2 pts. each)
1)
k
ˆ
3
j
ˆ
2
i
ˆ
a
+
+
=
v
k
ˆ
j
ˆ
2
i
ˆ
3
b



=
v
If
b
a
v
v
v
+
=
c
and
b
a
v
v
v

=
d
, find the angle between the vectors
c
v
and
d
v
.
A)
0
o
;
B)
44
o
;
C)
90
o
;
D) 120
o
;
E)
180
o
.
Answer__________
2)
If the scalar (“dot”) product between two vectors is
negative
, then:
A)
The magnitude of one vector must be negative;
B)
The magnitudes of both vectors must be negative;
C)
The smallest angle between the vectors must be greater than or equal to 0
o
, but
less than 90
o
;
D)
The smallest angle between the vectors must be greater than 90
o
, but less than or
equal to 180
o
;
E)
The smallest angle between the vectors must be greater than 180
o
;
Answer__________
3)
The graph below shows
position
as a function of
time
for two cars traveling on
straight parallel roads.
Which statement is true?
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 Fall '10
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 Physics, Velocity, constant speed, snow level

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