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Section #: ________
YOUR NAME: ___________________________
Section Instructor’s Name: ___________________________
Physics 207
Prelim 2 Exam
November 11, 2003
7:309:00 p.m.
PLEASE CHECK THAT THIS PACKAGE HAS 11 PROBLEMS ON 11 PAGES!
Three blank pages to be used as scrap paper should be attached at the end of
this package.
Two formula and value sheets have been handed out separately.
Write your answers directly on the question sheets in the spaces provided.
Multiplechoice problems will be graded based on the answer only; work need
not be shown.
For the other problems,
show enough of your work to indicate how you
arrived at your result.
Clearly label your work and your answers.
For
numeric answers be sure to give the appropriate units.
If you need more
space for calculations, use the backs of the question sheets and clearly label the
whereabouts of your work for each problem.
Work on separate scrap paper
will not be graded.
Do not spend too much time on any one problem or part of a problem.
Solve the
problems that you can solve easily first, and then return to the more difficult
problems.
It’s a good use of your time to read the entire exam before starting.
This is a closed book exam.
You may use nongraphing calculators.
For grading use only:
1. _____________
/
10
6. _____________
/
5
11. _____________
/
12
2. _____________
/
15
7. _____________
/
5
3. _____________
/
10
8. _____________
/
8
4. _____________
/
13
9. _____________
/
6
5. _____________
/
8
10. _____________
/
8
Total: _____________
/
100
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1.
[10 points]
A block of mass
m
is pushed
a distance
up a surface inclined at an
angle
d
θ
with respect to the horizontal at
constant speed by a horizontal
force
F
r
(see figure).
There is friction between the
block and surface.
Please express your
answers to the following in terms of one or
more of
m
,
F
,
d
,
,
g
(magnitude of
acceleration due to gravity), and pure
numbers (like 2, 0.5,
π
, etc.) only
.
m
F
r
d
(a) What is the work done by the force
F
r
?
.
__________
__________
__________
=
F
W
r
(b) What is the change in thermal energy of the block and surface due to
this motion?
.
__________
__________
E
1
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 Fall '08
 LIEPE

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