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NAME
Recitation Instructor:
Recitation Section #:
Physics 112
April 7, 2005
Prelim Exam #2
7:30  9 PM
PLEASE BE SURE THIS PACKET HAS 12 PAGES!
(
This includes the cover sheet and two scrap pages.)
This packet contains 5 Short Answer Questions, 3 Problems, and a page of Possibly Useful
Information.
There is also a page of scrap paper near the end.
Write your answers ON THESE QUESTION SHEETS in the spaces provided.
For Short Answer Questions #15, ONLY ANSWERS WILL BE GRADED.
For Problems #68, where algebra or computations are required, BE SURE YOUR METHOD
OF SOLUTION IS CLEAR, and SHOW YOUR WORK in the spaces provided.
If you need
more space, use the backs of the question sheets, and indicate the whereabouts of your
work for each question.
ANSWERS WITHOUT WORK will NOT receive credit (except for
short answer questions).
WORK ON SCRAP PAPER WILL NOT BE GRADED.
Point values for questions are given below.
BUDGET YOUR TIME.
Don't spend too much
time on any one question or part of a question.
Answer those questions you can do easily
first, and then return to the more difficult ones.
It is valuable use of your time to READ
THE ENTIRE EXAM before starting to work on it.
This is a CLOSED BOOK and CLOSED NOTES exam.
You may NOT use any other
references or personal assistance.
You MAY use a NONGRAPHING calculator.
For Grading Only (Do not write here):
1
/12
6
/14
2
/20
7
3
/9
8
/16
45
TOTAL
/100
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2
I.
SHORT ANSWER
[50 points]
Please write your answers in the spaces provided.
1.
[12 points]
The potential energy U(x) (in J) of a particle of mass 0.25 kg that can move
along the xaxis is graphed as a function of the particle's position x (in m).
0.1
0.2
0.3
0.4
0.5
0.5 0.4 0.3 0.2 0.1
0
0
1
2
3
4
1
2
3
4
x (m)
U(x) (J)
For each question below, please give ALL answers that apply.
Please round your answers
for position (x) values to the nearest 0.1 m.
(a)
Where (x = ?) are points of
stable
equilibrium?
(If none, write NONE.)
(b)
Where is the
force
on the particle directed to
the right (
→
)?
(If nowhere, write NOWHERE.)
(c)
Where would the magnitude of particle's
acceleration
be the greatest?
(d) If the particle were at x = 0.2 m moving to the
right (
→
), how much
kinetic energy
would it
need to have there in order to make it all the
way to x = +0.5 m?
(e)
If the particle started at x = 0.2 m moving to
the right (
→
) with just enough kinetic energy
to make it all the way to x = +0.5 m,
how fast
(in m/s) would it moving at x = +0.5 m?
NAME
3
2.
[20 points]
True/False
(Please circle your answers, T or F.)
(a)
When moving object A collides
elastically
with stationary object B,
it is possible for object B's
speed
after the collision to be greater in
magnitude than object A's
before the collision.
T
F
(b)
When moving object A collides
with stationary object B,
it is possible for object B's
momentum
after the collision to be greater
in magnitude than object A's
before the collision.
T
F
(c)
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This test prep was uploaded on 04/21/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell University (Engineering School).
 Fall '07
 LECLAIR,A
 Physics, mechanics

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