3/28  We have decided to drop an extra quiz.  We will
      now keep the best 9 quizzes.  Your quiz percentage
      will be the total of your best 9 quizzes divided
      by 90.

4/01  Due to time limitations I have chosen not
      to cover the Pendulum.  As a result, today's
      reading is changed to Ch 10, Sections 5,7,
      and 8.  Omit HW problems 65 and 72 which
      are about the pendulum.  Add HW problems
      50 and 52 which are about energy conservation
      for springs.  The final correct problem list
      for assignment 16 is thus 47,50,52,53,57,
      59,61,62,73, and 83.

4/11  On HW#19 for Th 4/10: drop #43 and add #94

4/24  On HW#22 for Th 4/24: drop 68,69 and add 76,77

4/29  On HW#23 for T  4/29: drop 20,22, and 67
                             add 41,46, and 57
                             (all from CH 16)

5/6   On HW#24 for T 5/06: drop 23, add 5