1. Physics 1A, Section 7 October 15, 2007

2. Reminders Homework #2 due Wednesday 4 PM Quiz #1 due Thursday noon, box outside 110 E. Bridge

3. OM Chapter 4

6. Circular Motion a = v 2 /r (At least two ways to show that.) v =  r

7. Quiz Problem 19

8. Answer: a) t = 2 (tan  - tan  ) cos2  v 0 2 / g

9. Quiz Problem 26

10. Answer: a) 10.3 m b) 2.04 s c) 4.97 m/s 2 d) ball, by 7.2 m/s e) 2.27 sec

11. OM, Problem 4-55

13. Answer: maximum height = R + R/2[Rg/u 2 + u 2 /Rg] (for u 2 ≥ Rg) specific case: u = 30 km/h, R = 0.80 m, g = 9.80 m/s 2  4.39 m

14. Thursday, October 18: Quiz Problem 36, part (a) OM, Chapter 5, Problem 55 Quiz Problem 37 Optional to work on these in advance.

15. Quiz Problem 34

16. Answer: a) v i = -sqrt[2gL/(1-e 2 )] b) t i = sqrt[2L(1+e)/(g(1-e))] c) h = Le 2 /(1-e 2 )