PHYSTCS
221
EXAM 2: November
14,
Fall 2007
2007 8:00pm-10:00pm
Name
(printed):
Recitation
I nstructor:
INSTRUCTIONS:
Section
#
This exam contalns
25 multiple-choice questions plus 2 extra credit questions, each worth 3
points. Choose one answer only for each question. Choose
the best answer
to each question.
Answer all questions.
Allowed material:Before
turning over
this page, put away all materials
except
for pens, pencils,
erasers,
rulers and your calculator.
There
is a formula
sheet attached
at the end of the exam.
Other copies of the formula sheet are not allowed.
Galculator:
In general,
any calculator,
including
calculators
that perform graphing,
is permitted.
Electronic
devices
that can storelarge amounts of text, data or equations
(like
laptops,
palmtops,
pocket computers, PDA or e-book readers) are NOT permitted.
lf you are unsure whether or not
your calculator
is allowed
for the exam, ask your TA.
How to fill in the bubble sheet:
Use a number 2 pencil. Do NOT use ink.
lf you did not bring a pencil, ask for one.
Writeand
fill
in the bubbles
corresponding
to:
-
Your
last name, middle
initial,
and
firstname.
-
* *
Your lD number
(the
middle 9 diqits on vour ISU cardl
*
*
-
Special
codes K to L are your recitation
section.
(Honors
section, please enter 24).
Always use
two digits
(e.9. 01, 09, 11, 13)
Please
turn over your bubbte sheet when you are not writing on it.
lf you needto change any entry, you must completely
erase your previous
entry. Also, circle
your answers on this exam. Before handing
in your exam, be sure
that your answers on your
bubble
sheet are what you intend
them
to be. You may also copy down your answers on a piece
of paper
to take with you and compare with the posted
answers. You miy
use the table at the
end of the exam
for this.
When you are finished with the exam,place all exam materials,
including
the bubble sheet, and
the exam itself,
in your folder and return
the folder
to your recitation
instruitor.
No cell phone
calls allowed. Either
turn off your cell phone or leave
it at home. Anyone
answering
a cell phonemust hand
in theirwork;their exam
is over.
Besf of luck, Paul Canfield and
paula
Herrera
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28. Which of the following changes
to an oscillating system will
cause
the smallest
change
in the system'speriod?
A)
For a spring / mass system, double thq mass.
B)
For a spring / mass system, double the spring constant.
$For
a simple pendulum (point mass on a string), double the length of the string.
'p)/For
a simple pendulum (point mass on a string), double the mass.
D
All
of the above changes affect the period in the same manner.
29. An insulating
rod with charge
Q
is placed at distance
d froman uncharged
metal
surface.
The electrostatic
force between
therods
is:
A) Zero.
B) Attractive
it
Q
>
0, repulsive
if
e
<
A.
A
Attractiv
e if
Q
(
0, repulsive
if
Q
>
0.
(92Attractive, independently
of the sign of
e.

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- Fall '08
- Herrera-Siklody
- Cartesian Coordinate System, René Descartes, rod, net electric field
-
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