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Physics 123A, Spring 2008
Exam 3
WOUWA123A082TE3(PCQ)sol2.doc
V.
[20 points total]
A ball moves back and forth forever on a frictionless track
consisting of two horizontal sections, shown at right (not to scale).
Assume that
the ball has enough kinetic energy to get from region B to region A, and that the
time the ball spends on the steep sections of the track is negligible.
The exact
heights and lengths of the two regions are unknown, except that region B is lower
and longer than region A.
A.
[5 pts]
Is the probability density in region A,
±
A
,
greater than
, less than,
or
equal to
the probability
density in region B,
B
?
Explain.
If not enough information is given, explain what additional
information is needed.
The probability density in a given region is the time per unit length the ball spends in that region
divided by the time it takes to traverse the entire track.
Since region A is higher than region B, the
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This note was uploaded on 07/01/2008 for the course PHYS 112 taught by Professor Wormer during the Spring '08 term at University of Washington.
 Spring '08
 WORMER
 Energy, Friction, Kinetic Energy

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