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Page 2
Physics 101
A
Hour Exam I
October
5
, 201
5
Page 2 of 2
(2
4
problems)
This Exam Booklet is Version A
.
Mark the
A
circle in the
TEST FORM
box in the bottom
right on the front side of your answer sheet.
DO THIS NOW!
Exam Format & Instructions:
This exam is a combination of
(3 points each)
ThreeAnswer Multiple Choice
FiveAnswer Multiple Choice
(6 points each)
There are 23 problems for a maximum possible raw score of 10
7
points.
Instructions for ThreeAnswer Multiple Choice Problems:
Indicate on the answer sheet the correct answer to the question (
a, b
or
c
).
Each question is worth 3 points. If you mark the wrong answer, or mark more than one
answer, you receive 0 points.
Instructions for FiveAnswer Multiple Choice Problems:
Indicate on the answer sheet the correct answer to each question (
a, b, c, d
or
e
).
Credit is awarded in the following way:
 If you mark one answer and it is correct, you will receive 6 points;
 If you mark two answers, and one of them is correct, you will receive 3 points;
 If you mark three answers and one of them is correct, you will receive 2 points.
 If you mark no answer or more than three answers, you will receive 0 points.
Page 3
PHYS 101 Exams
1)
2)
3)
Exam 1 (A)
The next three questions pertain to the situation described below.
A block of mass M = 5
kg
hangs in equilibrium from the ceiling as shown in the diagram.
Given that the block is in equilibrium, which of the following is necessarily true?
a.
The block cannot be moving.
b.
The block cannot experience any friction.
c.
The sum of all the forces acting on the block is zero.
The ycomponents of the two tensions T
1
and T
2
add up to
a.
42 N
b.
84 N
c.
31 N
d.
37 N
e.
49 N
The ratio T
1
/T
2
is equal to (Hint: write out the force equation along the xdirection)
a.
4.41
b.
0.65
c.
0.5
d.
6
e.
0.88
Page 1 of 9
Page 4
4)
5)
The next two questions pertain to the situation described below
.
A plane moving at a speed of v
a
= 1150 km/h relative to the air embarks on a flight from Houston to
Omaha separated by a distance of 1290 km directly northward. The pilot finds that there is wind
blowing from west to east at a steady speed of 160 km/hour.
At what angle west of north should the plane fly?
a. 1.59°
b. 1.99°
c. 2.66°
d. 3.99°
e. 8°
What is the plane’s speed relative to the ground v
b
?
a.
160 km/h
b.
1310 km/h
c.
1138 km/h
d.
1161 km/h
e.
990 km/h
Page 2 of 9
Page 5
6)
7)
The next two questions pertain to the situation described below
.
A block of mass M = 15 kg rests on a table. A force of F = 7 N is applied in the horizontal direction,
as shown. The block continues to remain at rest due to friction.
The force of friction opposing the motion has a magnitude of
a.
147.15 N
b.
7 N
c.
The information given is insufficient to answer the question
Now the applied force is increased to F = 29.4 N and this is the maximum force that can be applied
before the block begins to move. The coefficient of static friction μ
s
, is equal to
a. 5.01
b. 1.96
c. 19.23
d. 3
e. 0.2
Page 3 of 9
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