9/13/10

Post date: Sep 13, 2010 12:23:32 PM

Bell Ringer: What is your reaction time? (Have a partner drop a ruler, and see how far it falls before you catch it. Use this data to calculate the time it took for you to close your fingers.

• • Popper activity

    • Calculate the initial velocity of a "popper" without measuring time

    • If initial velocity doubled, calculate maximum height the popper would reach.

  • Practice problems / work time for labs

    • Page 82: 1, 2, 5, 10, 12, 14, 16-18, 20, 25, 31-34, 36

Answers for textbook review:

1. 8.0 m/s/s

2. a. 247 m/s/s

b. -207 m/s/s

5. 33 m/s

10. 9.2 x 10^2 m

12. a. 43 m

b. 43 m

14. 1.2 sec

16. 71 m/s

17. a. 1.4 x 10^2 m

b. 5.5 x 10^2 m

18. a. 24 sec

b. 7.4 x 10^2 m

20. a. 3.1 x 10^8 m/s/s

b. 11 x 10^-6 sec

25. a. Yes, it hits the barrier

b. 22 m/sec

31. 15.3 m/sec

32. a. -20 m/sec

b. -20 m

33. a. -15 m/sec

b. -10 m

c. 20 m

34. a. -25 m/sec

b. -30 m

c. 20 m

d. Bag is 20 meters below the helicopter after 2.0 seconds

36. -44 m