University Physics Errata Page
Interesting
excerpts from the text
The
following selections from the textbook appear to be in error.
Please
contact me below if you have questions, or disagree with
these.
On page 556, in
Example 15.2, part (b), it says, "we can write down the wave function
using Eq. (15.4)" and the equation shown starts
well enough with Eq. (15.4), but changes to Eq. (15.7) halfway through.
Page 566, Example
15.6 (a-d)
Incorrect
conversion from ‘cm’ to ‘m’ :
It should be 0.0075
m for 7.5 mm as listed in the problem
instead of 0.075 m which
corresponds to 7.5 cm
Books shows answer
= 2.66 W
I get 2.82 W (using .075, not .0075)
and using the values shown in the example.
All subsequent
answers depend on this answer
“Test Your Understanding” for Section 15.7
“Solution” does not
answer last part of question.
On page 595 (Volume
1 of the 3-volume set) says in Example 16.2, that "because the wave speed v
is greater in the inner ear than in air ..., the wave number, k = omega /
v is greater as well."
In Ex 16.1, it shows k is 18.3 r/m in air,
and then in Ex 16.2, part (b),
it shows that k is 4.2 r / m in the inner ear (water),
which is less, not greater than 18.3 r / m.
This should say :
"because
the wave speed v is greater in the inner ear than in air …
the wave number, k = omega / v is proportionally lower
(in a more dense medium as in the inner ear.)”
Page 595, Example
16.2 compares Example 16.1 and says that :
”because the wave speed in is greater in the inner ear than in air …
the wave number k = w / v is greater as well.”
However, in k = w /
v , k is inversely proportional to v,
And therefore the
wave number k is less than in the
previous example.
In Example 16.8, the
calculation for the answer to part (a) shows
2.26 x 104 for B where it should
show 3.16 x
104
Volume 2
Page 796
The term “body” in
the first paragraph is used with two different meanings ?
In one case, “body”
means the object,
and in the other, it means “system” ?
Page 799
“Test Your
Understanding” asks the reader to
”start with the situation shown in Figure 21. 6a” and
to “give the metal sphere a positive charge,”
but the figure already shows that.
The question should
ask to show a “negative charge” instead ?
Top of page 1253
Question for the author :
Is the “special case … that occurs at
an interface between vacuum,
for which the index of refraction is unity by definition,
and a material.”
Is this really “special”
?
Actually the math is
just simpler,
but it obeys exactly the same rules as any materials.
Page 1254 of the
Physics textbook, in a section entitled :
"Problem
Solving Strategy" under ""EXECUTE," #2,
refers to "some
simple geometry" and gives an example that
"an angle and its complement differ
by 180
degrees."
I believe the
definition is :
"the sum of complementary angles equals 90 (not 180)
degrees."
Complementary angles do not
differ by 90 degrees,
they add up to 90 degrees.
Supplementary angles do not
differ by 180 degrees,
they add up to 180 degrees.
Picky Typographical Errors :
On page 485, in
"Problem Solving Strategy," Step 3 says to
"define an x-axis as in Fig. 3.6" which shows a photo of
a tuning fork.
I think the author
meant Figure 3.8 ?
Page 551, Fig. 15.5
(top), says :
“all particles on string are
oscillate
…”
but should say :
“all particles in the fluid
oscillate…”
Page 599, Table 1 :
The second listing
for “Water (20 degrees C) 1543 m/s””
should be “Water (100 degrees C) 1543 m/s”
Chapter 33:
Another simple
typographical error that may have escaped your word processor's
"spell-check" is the use of "titled" in Figure 33.12 (b)
where I believe the word
that the author wanted is "tilted,"
referring to the angle of a mirror.
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