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Your Name
Discussion Instructor's Name:
Discussion Section:
Physics 112
October 5, 2004
Prelim Exam #1
7:30  9 pm
PLEASE BE SURE THIS PACKET HAS 12 PAGES!
(
This includes the cover sheet and 2 scrap pages.)
This packet contains 8 Short Answer Questions, 3 Problems, and a page of Possibly Useful
Information at the end.
There are also 2 pages of scrap paper near the end.
Write your answers ON THESE QUESTION SHEETS in the spaces provided.
For Short Answer Questions #18, ONLY ANSWERS WILL BE GRADED, unless
calculations are explicitly requested.
For Problems #911, 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.
You may NOT use energy methods.
For Grading Only:
13
/13
9
/30
45
/12
10
/10
68
/15
11
/20
TOTAL
/100
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2
SHORT ANSWER
[40 points]
Please mark your answers in the spaces provided.
1.
[5 points]
The distance from the North Pole to the Equator along the Earth's surface
is about 10
7
m.
If there were enough land area available on the Earth, roughly how long
would it take a person walking every day to walk around the world once?
(A)
3 weeks
(D) 30 years
Answer:
(B)
3 months
(E)
300 years
(C)
3 years
Please show your calculations:
2.
[4 points]
Three identical ideal springs, each having spring constant k, are connected
as shown.
F
F
k
k
k
What is the effective spring constant of this combination of springs?
(A) k/3
(E)
4k/3
(B) k/2
(F)
3k/2
2k/3
(G) 2k
(D) k
(H) 3k
3.
[4 points]
A ball that was thrown upward at a speed greater than its terminal speed
in the air is now moving upward at a speed equal to its terminal speed.
What is the ball's
acceleration at this instant?
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 Spring '07
 LECLAIR,A
 Physics, mechanics

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