physics textbook errata - Halliday and Resnick

Anonymous errata list:

1. In the inside back cover, the value of G is listed with a 11^-11 instead of 10^-11.
2. In homework problem 66 in ch. 14, the given data result in a density of 0.4 g/cm3, which is far too small for a rocky asteroid. The period of Dactyl's orbit is unknown, but is presumably significantly shorter than the one suggested.
3. In section 12-6, H&R claim to derive conservation of angular momentum from Newton's laws of motion. Their proof is erroneous, since equal and opposite forces do not necessarily produce equal and opposite torques. The proof only works in the cases where both forces' moment-arm vectors are the same, or where the force is center-to-center. As a counterexample to their proof, an isolated spinning bar magnet will gradually slow down due to the emission of radio waves, which carry off angular momentum. Since light is massless, the angular momentum carried by the radio waves cannot be discussed in the framework of Newtonian physics.