Duke University
Department of Physics
Physics 143
Fall Term 2007
PRACTICE FINAL EXAM
I will abide by the Duke Community Standard.
Name:
This is a closed book exam, with two sides of one page cheat sheet allowed.
Calculators are allowed, but only for basic calculations: you may not use
special memory, graphing etc. functions. You must always show your work
for credit.
Each problem is worth 10 points.
You must hand in your
cheat sheet with your exam.
Problem 1:
Two events occur at the same point
x
0
at times
t
1
and
t
2
in an inertial
frame of reference
S
, which moves with speed
v
relative to
S
. What is the
spatial separation of these events measured in
S
?
Problem 2:
Two spaceships approach each other. They are each viewed from Earth
as having a speed half that of light. What is their speed relative to each other?
Problem 3:
If you could convert 1 g of dirt directly into energy and you could sell the
energy for 10 cents per kilowatthour, how much money would you get?
Problem 4:
Describe the MichelsonMorley experiment, and explain how its result is
relevant to Einstein’s theory of special relativity.
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Problem 5:
Consider two inertial reference frames. When an observer in each frame
measures the following quantities or performs an experiment to test the fol
lowing laws, which experiments made by the two observers must yield the
same result? Explain your reason for each answer.
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 Fall '07
 Scholberg
 Atom, Energy, Photon, Special Relativity, Heat

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