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Lecture: 21 (iq18)

Review unit 2: selected topics

1. 3 identical planets in a symmetric configuration.

2. Micro-Macro correspondence: Young’s modulus.

3. ks and ds of chemical bounds among different isotopes.

4. Which ship got fit first?

5. Analytic solution of a mass-spring system

Announcement:

A checklist on the course materials you should review for midterm2.

1. Course materials from Sec3.1 through Sec6.7.

o Textbook figures, Examples, clicker questions

o Exercises with X designation, which have answers

o Homework problems

2. More challenging problems from the TA sessions

o Group problem 3: 4P81, 5P18

o Group problem 4: 5 P 65; 6.P.107*.

*Notice that 6.P.107 involves the potential energy it belongs to unit 3. You are not responsible for this problem for midterm 2.

o Reflection problems for model 2. For the 2D projectile motion with fixed initial speed, pay attention to the relationship between initial angle, height and the range.

Those students with SSD-arrangement please touch base with me after the class.

Reminder: Instructor’s office hour today from 3-4pm. You are welcome to discuss your last minute questions.