Errors in Unit N, 2/e

NOTE: In all that follows I will use <letter name> to represent a Greek-letter variable, ^ to indicate that the next quantity is superscripted, _ to indicate that the next quantity is subscripted, and boldface to indicate a vector quantity. I will also go against typographical convention and put punctuation outside of quotation marks to make whatever is enclosed in quotes exactly reflect what is (or should be) in the text. The date at the end of each error specifies the date when the error was first posted.

  • page 16, problem N1S.5: change two occurances of "speed" to "velocity" (for the sake of precision). (8/17/05)
  • page 19, third line below box: change "velocity at an instant" to "acceleration at an instant" (08/14/04)
  • page 37, answer to exercise N2X.8, next-to-last line: square the <delta>t. (5/29/03)
  • page 45, figure N3.7d: the two arrows labeled F_N should have the same length. (8/14/04)
  • page 47, fourth line of example N3.6: insert "on undriven wheels and drag forces" just before "are negligible". (8/17/05)
  • page 48, equation N3.3: change F_N(C) to F_N(T). (08/14/04)
  • page 53, problem N3T.5: delete the vector arrows above F_T in answers C and D. (5/29/03)
  • page 55, problem N3S.5, fourth line from end: change "concept of work" to "concept of k-work". (08/14/04)
  • page 55, problem N3S.6, last line: change k to K and make both "v"s italic. (8/14/04)
  • page 56, figure N3.12, parts (c) and (d): replace the F_SF label that occurs in each drawing with F_KF. (08/14/04)
  • page 59, second to the last line in the box around equation N4.8: insert "the" before "object's". (8/17/05)
  • page 63, sixth line of example N4.2: insert "as" after "for as long". (8/17/05)
  • page 67, example N4.4. I should have stated in the "Problem" part that we will ignore air drag. (08/14/04)
  • page 74, problem N4T.6, fourth line: change "northward" to "southward" to make this problem consistent with problem N4T.7 (8/17/05)
  • page 75, problem N4S.7, part (b): delete "2.0 m". (5/29/03)
  • page 75, problem N4S.8: all references to the letter q should be to <omega> (two places). (9/11/02)
  • page 75, problem N4S.8: first line: insert "on" after "if you step hard". (8/17/05)
  • page 76, problem N4S.12, third sentence: replace this sentence with "Does an object whose acceleration is constant in magnitude and always points toward the center necessarily move with a constant speed in a circle (assuming the object's initial velocity is perpendicular to its position relative to the center)?" (8/17/05)
  • page 81, third line of last paragraph before section N5.3: insert "the" between "But" and "interaction". (8/17/05)
  • page 91, problem N5S.1. Add "Estimate the force that a person can exert on the chain." at the end. (5/29/03)
  • page 99, fourth full paragraph, last line: "between" should not be in italics. (5/29/03)
  • page 99, fifth line of last paragraph: insert "the" between "that" and "applied horizontal force". (8/17/05)
  • page 108, problem N6T.5, first line: insert "without anti-lock brakes" after "car". (8/17/05)
  • page 118, next-to-last line before section N7.3: replace "block" with "object". (8/17/05)
  • page 119, example N7.3, Translation and Model, second line: change "free-body" to "free-particle". (8/17/05)
  • page 123, drawing for Translation: the right-going arrow from the word "Contact" should point to the place where the string meets Block B, not to just the string. (8/17/05)
  • page 123, Example N7.4, the rightmost vector equation near the bottom, top row: -m_Bg should be +m_Bg and +F^B(S)_T) should be -F^B(S)_T). (08/22/03).
  • page 137, exercise N8X.3, second line: insert "due north of the circle's center and" after "the car is". (8/17/05)
  • page 141, example N8.3, add a label "F_D" to the downward arrow in the rightmost diagram. (5/29/03)
  • page 144, problem N8T.5, first line: change "rounds a curve" to "rounds an unbanked curve". (5/29/03)
  • page 144, problems N8T.6 through N8T.8: change "to the right" to "below". (8/17/05)
  • page 147, problem N8A.1: the hint should refer to the sign of the single derivative of <theta>, not the double-derivative (three places). (9/11/02)
  • page 147, equation N8.34: make "v" italic, and add "(south of east)" at the end. (8/17/05)
  • page 160, problem N9T.7: first and second lines: replace "at the right" with "below". (8/17/05)
  • page 179, middle of four-to-last line before exercise N10X.8: replace "t_D" with "t_T". (8/17/05)
  • page 181, problem N10S.2, part a: add "in" to the phrase "given section N10.5" (9/11/02)
  • page 183, problem N10S.13, part c, fourth line: units of the constant k should be Ns^3/(m^2 rev) (the constant only has this value if it is multiplied by a rotation rate in rev/s). (9/11/02)
  • page 197, fifth line above equation N11.23: delete "then" from "then the object's...". (8/17/05)
  • page 201, problem N11S.11, end of third-to-last line in part b: add "or equal to" after "be less than". (8/17/05)
  • page 211, line following equation N12.13: references should be to equations N12.13 and N12.12 (instead of to N12.12 and N12.11). (8/17/05).
  • page 214, example N12.1: Add following the last line: "It is also a bit further from the earth's center, so it must travel further to complete the orbit." (8/17/05)
  • page 218, 6th line below equation N12.24: change "lots of light that is not seen" to "lots of light, but that light is not seen". (8/14/04)
  • page 220, problem N12S.9, third line: the correct quark force law is F = b, not F = br. (9/11/02)
  • page 224, figure N13.1: each focus should be about 2 mm closer to the center. Also <epsilon> in the equation for b should be squared, not cubed. (8/17/05)
  • page 225, third line below exercise N13X.1: change "difference is a" to "difference which is a". (5/29/03)
  • page 233: third-to-last line: replace GM/r with 2GM/r. (8/17/05)
  • page 234: equation N13.22: change "10.3 <degrees>" to "169.7 <degrees>". (8/17/05)
  • page 234: equation N13.23b: 10^8 in the numerator should be 10^7, and the answer should be 1.05. (8/17/05)
  • page 234: equation N13.23c: 0.44 should be 0.05, and 1.33 should be 1.5. (8/17/05)
  • page 235, equation N13.25: result should be -2.128 x 10^7. (08/17/05)
  • page 235, equation N13.26: "2.16" in the denominator should be "2.128", and the result should be 1.875 x 10^7 m. (08/17/05)
  • page 235, next-to-last line: the reference should be to figure N13.8, not N12.7. (8/17/05)
  • page 236, equation N13.29: +2GM/(r_f + r_c) should be -2GM/(r_f + r_c). (8/22/03)
  • page 236, equation N13.30, first line: +2GM/(r_f + r_c) should be -2GM/(r_f + r_c). (8/22/03)
  • page 236, equation N13.30, second line: change sign of both terms in the square root. (8/22/03)
  • page 236, equation N13.30, last line: answer is 10,900 m/s, not 22,200 m/s. (8/22/03)
  • page 236, line below equation N13.31: increase in speed is 3100 m/s, not 14,400 m/s. (8/22/03)
  • page 236, problem N13T.2, 2nd line: units of 2E/m are m^2/s^2, not m^3/s^2. (5/29/03)
  • page 237, problem N13B.1, 2nd line: units of 2E/m are m^2/s^2, not m^3/s^2. (9/11/02)
  • page 238, problem N13R.2, just before part (a): reference should be to problem N13S.3, not N13S.4. (8/14/04)

5/29/03: Thanks to Vic DeCarlo, David Tanenbaum, and Jonathan Mitschele for finding many of the errors posted on this date.

8/14/04: Thanks to Eric Murray and Tom Bernatowicz for some of the errors posted on this date.

8/17/05: Thanks Tom Bernatowicz, Barbara Hoeling, and my Physics 51a students for spotting some of the errors posted on this date.

 

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