Physics textbook errata - Serway & Faughn
Page 96, Chapter 4, Problem 13
Errors in Physics Textbooks - a listing of known physics textbook errata.
However, I don't have the time to check out all physics
textbooks myself. If you are aware of errors that I have not included from
this or any other physics textbook, please
e-mail me the details.
College Physics - 4th Edition
by Serway & Faughn
The book give the answer as 7.00s at 143 m/s.
The answer should be 2.67s at 29.96 m/s
Problem 9, chapter 13 (the pogo stick):
The answer to part (b) is wrong, and should be 41 cm.
Their solution assumes that the spring in the pogo stick
extends past equilibrium as you rise up off the ground:
that amounts to gluing the bottom of the pogo stick to the
ground & bouncing up and down on it with the tip never
leaving the ground. The spring should just return to
equilibrium and stay there as it leaves the ground.
Chapter 14, problem 23 page 460
The problem reads: At rest, a car's horn sounds the note
A (440 Hz). The horn is sounded while the car is moving down
the street. A bicyclist moving in the same direction with
one-third the car's speed hears a frequency of 440 Hz. How
fast is the car moving? Book's answer: 32.1 m/s
If they both hear 440 Hz, the car and bike must be traveling at the same
speed in the same direction. Since the bike has a speed of 1/3 the
car's speed, they must both be at rest.
If you look in the student solution manual, you'll see that they
assume the bicyclist hears 415 Hz, which gives the answer in the back
of the book. The 440 for the bicyclists speed is a typo, and should actually be 415 Hz.