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PH2100
Exam III
Spring 2006
INSTRUCTIONS
1.
Remove the blue answer sheet from the exam booklet.
2.
In the lefthand column entitled Student Enrollment Sheet,
print and code
in your
I.D. number and name
using a #2 pencil. Your MTU student ID number should be filled in without dashes. For most students, the
I.D. number is your Social Security number. If your MTU I.D. number is an “Mnumber”, replace the
leading “M” with a zero. All other entries, besides your answers, should be left blank.
3.
Please cover your Answer Sheet at all times
. Please keep your eyes on your own papers.
4.
Be sure to fill in the circles completely and avoid stray marks on the Answer Sheet.
5.
This is a ninety minute exam.
6.
This is a closed book exam.
You may use the PH2100 Formula Sheet that is attached at the end of this
exam. You may find it convenient to rip the formula sheet from the exam booklet.
7.
Graphing calculators are permitted, but equations may not be stored in calculators, nor may calculators be
exchanged.
8.
Cell phones and other communication devices should be turned off and may not be used during the exam
period.
9.
Assume all numerical data supplied with the problems have three significant figure accuracy, unless
explicitly identified otherwise.
10. This exam consists of a total of 30 questions: each is worth five points.
The total number of points
available on the exam is 150.
11. If you have any questions during the exam, please raise your hand and wait for assistance.
12. Please turn in only your answer sheet. You may keep the exam booklet and formula sheet.
Please sit in seat number: ____________
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View Full Document PH2100
Exam III
SPRING 2006
1
1. In uniform circular motion, which one of the following quantities is not
constant?
(A)
speed
(B)
angular acceleration (d
ω
/dt)
(C)
magnitude of net force
(D)
acceleration vector
(E)
radial velocity component
The following information pertains to the next three questions:
A child is sitting on the outer edge of a merrygoround that is 4.5 m in diameter
. The child's friend pushes the
merrygoround in order to maintain a constant angular velocity of 8.0 rev/min for 20 s and then lets go. The
angular velocity of the merrygoround as a function of time is shown in the figure below.
2. What is the velocity of the child in m/s at time t = 10.0 s?
(A)
0.932 m/s
(B)
2.36 m/s
(C)
1.65 m/s
(D)
1.88 m/s
(E)
2.01 m/s
3. What is the angular acceleration (d
ω
/dt) (in rad/s
2
) of the merrygo
round at time 40.0 seconds?
(A)

8.22
×
10
3
rad/s
2
(B)

6.17
×
10
3
rad/s
2
(C)

2.09
×
10
2
rad/s
2
(D)

4.34
×
10
2
rad/s
2
(E)

1.56
×
10
1
rad/s
2
4. How many revolutions did the merrygoround make in the time interval from 0 to 60.0 s?
(A)
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This note was uploaded on 10/31/2011 for the course EE 101 taught by Professor Gibbons during the Spring '09 term at Michigan State University.
 Spring '09
 Gibbons
 Electrical Engineering

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