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101Fa11Exam3VersionA.pdf
101Fa11Exam3VersionA.pdf
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101Fa11Exam3VersionA.pdf-Physics 101 A Hour Exam III
Page 2
Physics 101
A
Hour Exam III
Fall
2011
Page 2 of 9
(23 problems)
This Exam Booklet is Version A
.
Mark the
A
circle on the
TEST FORM
box in the
bottom right on the front side of your answer sheet.
DO THIS NOW!
Exam Grading Policy
—
The exam is worth a total of
117
points, and is composed of three types of questions:
MC5:
multiple-choice-five-answer questions, each worth 6 points.
Partial credit will be granted as follows.
(a) If you mark only one answer and it is the correct answer,
you earn
6
points.
(b) If you mark
two
answers, one of which is the correct answer,
you earn
3
points.
(c) If you mark
three
answers, one of which is the correct answer, you earn
2
points.
(d) If you mark no answers, or more than
three
, you earn 0 points.
MC3:
multiple-choice-three-answer questions, each worth 3 points.
No partial credit.
(a) If you mark only one answer and it is the correct answer,
you earn
3
points.
(b) If you mark a wrong answer or no answers, you earn
0
points.
TF:
true-false questions, each worth 2 points.
No partial credit.
(a) If you mark only one answer and it is the correct answer, you earn
2
points.
(b) If you mark the wrong answer or neither answer, you earn
0
points.
Unless told otherwise, you should assume that the acceleration of gravity near the
surface of the earth is 9.8
m/s
2
downward and ignore any effects due to air resistance.
Choose the closest number to the correct answer when a numerical answer is required.
Page 3
Physics 101
A
Hour Exam III
Fall
2011
Page 3 of 9
(23 problems)
The next five questions pertain to the same physical situation.
A block of mass m = 1.5 kg is connected to a spring as shown in the figure. Both the
block and the spring lie on a frictionless horizontal table. The graph plots the x coordinate
of the block versus time. The x coordinate is measured in meters and the time is
measured in seconds. Assume the block undergoes a simple harmonic motion about the
equilibrium extension of the spring marked as x = 0.
1.
What is the amplitude of t
he block’s oscillation?
a.
0m
b.
2m
c.
4m
2.
What is the frequency of the
block’s oscillation?
a.
0.5 s
–1
b.
1 s
–1
c.
2 s
–1
d.
3.14 s
–1
e.
5 s
–1
3.
At which time does the magnitude of the total force applied to the block attain its
minimum?
a.
t = 0.5 s
b.
t = 1.25 s
c.
t = 2 s
d.
t = 2.75 s
e.
t = 3 s
4.
At which time does the kinetic energy of the block attain its maximum value?
a.
t = 0 s
b.
t = 0.75 s
c.
t = 1.5 s
d.
t
= 3 s
e.
t = 3.25 s
5.
Now assume that at time t = 2 s, a block of mass M = 0.5 kg is firmly attached to the
original block. How would the maximum kinetic energy of the two blocks, KE
2
, for t > 2 s
compare to the maximum kinetic energy of the single block m, KE
1
, for t < 2 s?
a.
KE
2
< KE
1
b.
KE
2
> KE
1
c.
KE
2
= KE
1
m
x
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