Physics 121 Honors
Common Exam 3
Spring 2003
Name:
Section:
Closed book exam. Only one 8
.
5
00
×
11
00
formula sheet (front and back side) can be used. Calculators are
allowed. Use the scantron forms (pencil only!) for the multiple choice problems. Circle the answers on the
examination sheet as well, and return it together with the scantron form. Use the back of these pages, or
attach your own pages with solutions for problems that require calculations.
The eight multiplechoice problems are 6 points each.
Partial credit (up to 4 points) will be given for
multiplechoice problems, if you provide a detailed solution on the examination sheets. The four workout
problems are 13 points each. The nominal number of points is 100.
Clearly print your first and last name and indicate your section number on both the scantron form and the
examination sheet.
Good luck!
MultipleChoice Problems
Problem 1:
Four 1.50 V batteries in series are used to power a transistor radio. If the batteries can provide
a total charge of 240 C, how long will they last if the radio has a resistance of 200
Ω
?
A)
29 min
B)
43 min
C)
133 min
D)
533 min
E)
1200 min
P
E
=
P
R
⇒
i
E
=
i
2
R
⇒
i
=
E
R
=
∆
q
∆
t
⇒
∆
t
=
qR
E
=
8000 s
≈
133 min
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 Spring '08
 Opyrchal
 Physics, Resistor, Ω, scantron form, energy dissipation rate, multiplechoice problems, workout problems

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