Seat #
Physics P202
R. Heinz/R. de Ruyter
EXAM #2
March 4, 2004
6:30–8:30
PM
INSTRUCTIONS
1.
Please indicate with form (1, 2, 3, or 4) exam you have by marking the
appropriate bubble in column “P” of the SPECIAL CODES box on your answer
sheet.
Your exam is form 1
.
2.
Sit in SEAT # given above.
3.
DO NOT OPEN THE EXAM UNTIL YOU ARE TOLD TO DO SO.
4.
Print your name (last name first) and blacken in the letters on the answer sheet
with a #2 pencil.
5.
Print your student number (identification number) and blacken in the numbers on
the answer sheet with a #2 pencil.
6.
Use the fronts and backs of the question sheets for scratch work. Do not use any
other scratch sheets.
7.
This is a multiple choice exam. Blacken in the answer to each question on the
answer sheet. Fill in one and only one answer to each question.
8.
Keep your eyes on your own work.
9.
You have two hours to complete the exam. When you finish, please show your
picture ID as you turn in your answer sheet. Please leave quietly so others are not
disturbed.
10.
THERE ARE 24 QUESTIONS PLEASE ANSWER ALL OF THEM.
THERE IS NO PENALTY FOR GUESSING!
This is a closed book, closed note exam!
You may use only a calculator and
two selfprepared sheets of formulas.
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1.
A charging
RC
circuit controls the intermittent windshield wipers in a car. The
emf is 12.0 V. The wipers are triggered when the voltage across the 125
F
capacitor reaches 10.0 V; then the capacitor is quickly discharged (through a
much smaller resistor) and the cycle repeats. What resistance should be used in
the charging circuit if the wipers are to operate once every 1.80 s?
a.
8.0 k
Ω
b.
12.0 k
Ω
c.
16.0 k
Ω
d.
20.0 k
Ω
e.
24.0 k
Ω
2.
How much work are the batteries in the circuit of the figure below doing in every
10.0 s time interval?
a.
0.80 J
b.
12 J
c.
32 J
d.
80 J
e.
120 J
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 Spring '09
 WARREN
 Physics, Magnetic Field, b. c. d.

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