This is HW 7 problem set, due on Monday October 22, 2007 of the
PHY161H class for Fall 2007 Lecturer: J. Rafelski.

RECALL: you are expected to do these problems and have a clean write up, but there is no hand-in, instead there will be a 12 min quiz valued at 2%, testing your knowledge of one of the problems from this home work. However, I may check your collection of problems should I need more information about your work.

Note: it is not enough to know the answers, understanding the problem and knowing the path to the solution is more important.
Problems are meant to be done in sequence set. Comments are for my use
Problem 9.3 page 308 (angular dynamics)
Problem 9.11 page 309 (blender dynamics)
Problem 9.51 page 311 (I-scaling),
Problem 9.47 page 311 (Flywheel)
Problem 9.39 page 310 and: Reevaluate this problem for all dimensions going up by factor 2 (I-Spoked wheel)
Problem 9.75 page 313 and do this when the hands are as close as possible to rotation axis, also read 10.41 page 347 (I-human)
Problem 9.97 page 314 + do this problem with a decreasing value of mass density (choose) and make sure you understand both results (I-cylinder with variable mass distribution)
Problem 9.79 page 313 (I_Earth)
Problem 9:85 page 313 (mass dropping and pulley rotating countered by block with friction)
Problem 9:86 page 314 and compare to free fall Answer: 2.81m/s vs 9.90 m/s (if wrong, three first valid comments get a bonus) (mass dropping and pulley rotating weight against weight)
READING BONUS: I have a problem (!) with the next section Problem 10.67 page 350 -- 1 % bonus to the three first students who submit by Email a correct solution to my both Emails, including jrafelski@yahoo.com. In part my problem is that I see no use for the statement of the value of the radius of the pulley, and in part since I did not get the `right' answer compared to the end of the book.
NOTE: in that line of thought, problem 9.43 page 311 is ill posed even if the questions and answers given in book make sense, note: http://en.wikipedia.org/wiki/Tidal_locking (nice article).
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