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Instructor’s informal sessions:

• Tuesday 3:30-4:20, WAG 420
• Friday 4-5pm, RLM4.102.

Lecture 34

· Physical pendulum: Exercises.

· Damped Oscillator:

o Resistive force R = - bv.

o Q factor: Q=2pE_env/|DE_env| = (km)^1/2/b.

· Oscillator driven by a sinusoidal force

o F=F₀ cos wt

o At resonance: A=(F₀/k) Q

· HW 12: Q12

Reminders:

· HW12 is relatively easy and short. Please complete it asap. Bring your questions to today’s informal session for more discussion on HW12.

· Please work on reexam03 over the weekend. It is a good opportunity for you to review midterm03 material while your mind is still fresh. Should there be any questions asked this final, you will be able to do this portion of the final well. Additional considerations:

· Bonus: Remember you can replace your lowest homework scores by your reexam scores. If you do well in your reexam, you may also earn bonus points for your TA session-score.

· The multi-try feature is on for reexam03.

· Limited helps: On reexam03, you may discuss with your friends. I may also give you some help during this afternoon’s 4-4:50pm session, if time permit.

Let me reiterate, our teaching team, both Fung and myself are trying our best to make it easy on you and to entice you to take the reexam03. We believe reexam scheme is an efficient way to help you to review the material of midterm3. It should benefit you.

We need your help: After you have completed your reexam03, please email us your opinion:

• Is a good idea for us to continue the reexam scheme in future semesters?
• Any additional suggestions about this course are welcome also.