Modern Physics for Scientists and Engineers
4th Edition
ISBN: 9781133103721
Author: Stephen T. Thornton, Andrew Rex
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 19Q
In each of the following pairs, which is the more massive: a relaxed or compressed spring, a charged or uncharged capacitor, or a piston-cylinder when closed or open?
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An open system is one in which.......
O Mass crosses the boundary but not the
energy
Neither mass nor energy crosses the
boundaries of the system
O Mass does not cross boundaries of the
system, though energy may do so
O Both energy and mass cross the boundaries
of the system
In each of the following pairs, which is the more massive: a relaxed or compressed spring, a charged or uncharged capacitor, or a piston-cylinder when closed or open?
(e) Explain why can we write the following equation for large r
d F., 2µE
dr2
F = 0
(21)
Before we solve for F we to utilize the fact if E > 0 then the particles
will behave as if they are free (free meaning independent) (there will be
too much energy for the particles to stay together if E > 0); however we
want to interpret a situation where the particles interact with each other,
hence we are only interested in E 0, then we can
write E = -E' (ensuring E is negative because E' is positive) Now we
will rewrite equation (21) as
dF 2µE'
-F
(22)
%3D
dr2
Note that 4, E' and h are all positive constants.
Chapter 2 Solutions
Modern Physics for Scientists and Engineers
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