Physics 221 2004 S Exam 1
Page 1 of 9
PHYSICS 221
Summer 2005
EXAM 1: June 27, 2005
 Solutions
Name (printed): ____________________________________________
ID Number: ______________________________________________
Section Number: __________________________________________
INSTRUCTIONS:
Questions 110 are worth one point each, 1115 are worth two points, as marked.
Answer all questions. All questions are multiple choice.
Before turning over this page, put away all materials except for pens, pencils, erasers,
rulers, your calculator and “aid sheet”.
An “aid sheet” is one two sided 8½
×
11 page of notes prepared by the student.
In general, any calculator, including calculators that perform graphing numerical analysis
functions, is permitted. Electronic devices that can store large amounts of text, data or
equations are NOT permitted. If you are unsure whether or not your calculator is allowed
for the exam ask your TA.
Examples of allowed calculators: Texas Instruments TI30XII/83/83+/89, 92+
Casio FX115/250HCS/260/7400G/FX7400GPlus/FX9750 Sharp EL9900C.
Examples of electronic devices that are not permitted: Any laptop, palmtop, pocket
computer, PDA or ebook reader.
In marking the multiple choice bubble sheet use a number 2 pencil. Do NOT use ink. If
you did not bring a pencil, ask for one. Fill in your last name, middle initial, and first
name. Your ID is the middle 9 digits on your ISU card. If you need to 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.
It is strongly suggested that you circle your choices on the question sheet.
You
may also copy down your answers on the record sheet (page 7) and take this page with
you for comparison with the answer key to be posted later.
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 the front of the room.
No cell phone calls are allowed. Either turn off your cell phone or leave it at home.
Anyone answering a cell phone must hand in their work; their exam is over.
Total number of questions is 15.
Throughout this exam, use 10 m/s
2
for the acceleration due to gravity.
GOOD LUCK!
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[1]
(1 point)
The components of vectors
A
a
and
B
a
are given as follows:
2
3
1
1
4
5
x
x
y
y
z
z
A
B
A
B
A
B
= +
= 
= 
= 
=
=
The components of the vector
2
C
B
A
=
+
ca
a
a
are:
(A)
4
3
14
x
y
z
C
C
C
= 
= 
=
(B)
1
2
9
x
y
z
C
C
C
= 
= 
=
(C)
8
2
9
x
y
z
C
C
C
=
= 
=
(D)
4
2
14
x
y
z
C
C
C
= 
= 
=
(E)
None of the above
The correct answer is A, as you can confirm by calculating 2B
x
+A
x
, etc.
[2]
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 Fall '08
 HerreraSiklody
 Physics, Force, Velocity, Correct Answer

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