Answers for Practice Test #2

1. (Chapter 5 problem combining forces and motion)
   a = 5.19 m/s² and x_f = 0.87 m.

2. (chapter 6 motion in 2-D)
   spend some time thinking about what the graphs would look like (if it helps, turn the picture upside down and pretend that you fire a ball from a cannon from the top of a cliff).
   Answer: ship must be a horizontal distance of 0.545m from the opening. (assuming typical widescreen TV size is more than 60-80 cm wide)

3. (chapter 7 univorm circular motion)
   v = 2.83m/s and T = 100 N

4. (chapter 8 Newton's third law)
   (a) Don't forget to identify the action-reaction pairs
   (b) N_SonB > W_B > W_A = N_BonA = N_AonB
   (c) T_rope > f_SonA > f_BonA = f_AonB = T_wall