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ISP209f5 Lecture 9
1
Today – Exam #1 Review
• Exam #1 is Thursday Feb. 7 in this room, BPS
1410
• The exam is 40 multiple choice questions.
There are a few questions where you will have
to use a formula.
• Bring your student ID
• You will have the full 80 minutes for the
exam.
• You can bring one sheet of notes (front and
back)
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2
Einstein Equation
ij
ij
ij
ij
T
c
G
g
Rg
R
4
8
2
1
π
λ
=
−
−
• A tensor equation that describes how spacetime is
influenced by mass.
•The left side is the curvature and motion of space and
the right side is the location and motion of mass and
energy.
• Rij is the Ricci tensor, g is the metric of spacetime, G
is the gravitational constant, Tij is the stressenergy
tensor.
ISP209f5 Lecture 9
3
Program for Today
• We will read through the review sheet.
• I will give some sample problems.
• Some of the exam problems will be very
close to homework problems.
• A couple of the samples we will use as
clicker problems
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4
The Scientific Method
• Science – No theory can ever be proven true. We are always
looking for theories that work better.
• Pseudoscience (not bad, just not science)
–
The hypothesis is not at risk.
If data does not agree with the
hypothesis, then the data is assumed to be wrong.
– Some facts are ignored.
– Exploit the controversies and inadequacies in a competing theory.
– Portrayed as an underdog being punished by the scientific
establishment.
– Reliance on fear and other emotions, or reliance on a lack of
knowledge
– People who do pseudoscience usually do not publish in normal
scientific journals.
ISP209f5 Lecture 9
5
Vector Problem
•
Which of the following is not a vector:
A. Position
B. Velocity
C. Mass
D. Force
E. Momentum
The correct answer is C.
Vectors have a magnitude (60 mph) and direction (East). Scalars
have only a value (4 kg).
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6
Motion
• Velocity is the rate of change of position
• Acceleration if the rate of change of
velocity
• Force is the rate of change of momentum
• Momentum = mass x velocity
Example: If the mass of an object is large, it can take a large
force to change its velocity.
ISP209f5 Lecture 9
7
It’s all in the slopes
position
time
Velocity
Rate of change of position
velocity
time
Acceleration
Rate of change of velocity
momentum
time
Force
Rate of change of momentum
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This note was uploaded on 07/25/2008 for the course ISP 209 taught by Professor Sherrill during the Spring '07 term at Michigan State University.
 Spring '07
 Sherrill

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