123B Lecture Homework

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Lecture homework assignments will be given below. They will be assigned almost every week, and will be due the following week in lecture (on the dates given below---usually on Wednesdays in class). Solutions will be posted. All problems are PROBLEMS (as opposed to conceptual questions) from Halliday/Resnick/Krane, unless specified otherwise. The worked example column contains a link to solutions to problems similar to those in the assignment.

HW set	Problems	Due Date	Worked examples
1	ch 19: #18, 22, 24, 52	Wed. April 7th	Ch.19 # 3, 9, 15, 25, 32, 33, 42.
2	ch 20: #6, 10, 19, 32, 36, 76 See note below	Wed. April 14th	Ch.20 # 1, 17, 47, 53, 54, 58, 65.
3	ch 40: #9, 14, 16, 17	Wed. April 21st	Ch.41 # 8, 9, 10.
4	ch 41: 19, 31, 32, 47 ch 42: 7, 23, 27, 28 (see notes below)	Wed. April 28th	Ch.42 #5, 18.
5	ch 43: 18 (see note below), 36 ch 44: 3, 6	Wed. May 5th	Ch.43 #7, 9, 15, 22, 47, 48.
6	ch 44: 18, 32 ch 45: 14, 26	Wed. May 12th	Ch.44 #9, 26, 42 and Ch.45 #7, 22, 26.
7	ch 45: 40, 46 ch 46: 12, 14	Wed. May 19th	Ch.45 #28, 33 and Ch.46 #3, 15, 23, 27, 34, 35.
8	ch 47: 7, 9, 24, 28 ch 48: 15	Wed. May 26th	Ch.47 #19, 22, 32, 40 and Ch.48 #7, 10.
9	Ch. 48 #16, 20, 21.	Fri. June 4th	Ch.49 #27, 37, 49, 52, 55.

Notes

• HW2, ch20.76: the question is ambiguous. Assume that both trains are moving at v=34.2 m/s towards each other.

• HW4 ch42.23. You may not know what the half-angle of a cone is. If you slice through the center of the cone, you have something that is almost a triangle except for the curved end, which is part of a circle. The angle opposite the curved end is the "full-angle" of the cone. Half of that angle is the half-angle.
• HW4 ch42.28, part (b) may be unclear. A more precise wording is: "How many signals does Fred receive from Ethel that were sent during her outward journey?"
• HW5 ch43.18 requires an assumption about whether the image lies directly above the object or not. Assume first that it does lie above the image, and then try and determine whether this is correct.