Laboratory for 2/9/99

Exam I will take place during the lab period on Tuesday, Feb. 9. You will have the full three hours, but most finish within two hours. The exam will consist of 6 to 8 problems and cover Chapters 1 through 3.

Below are a few sample problems from a previous exam (1992). You are responsible for all material covered in lecture and homework assignments. DO NOT ASSUME that a subject not covered in the sample exam below will not show up on Tuesday's exam!

During the exam, you will be provided with an equation sheet. You will be allowed to use only the equations on the sheet, or others that you derive from those on the sheet. I would suggest that you create your own equation sheet from the equations in the summary at the end of each chapter and use only that when trying the problems below. Resist the temptation to simply look for a similar problem in the text or notes (the standard "get the homework done" technique). That will better prepare you for the exam. If you can't solve the problems, come see me. And don't wait until Monday night!!

1. A person walks east for 100 m, then north for 200 m, and finally 100 m along a diagonal street that is 45^o north of east. What is the magnitude and direction of this person's total displacement?

2. You fly from STX directly north to STT at 120 mph in 20 minutes. You then fly directly east to Virgin Gorda at 100 mph for 24 min.
   a) What was your average speed for the entire trip?
   b) What was your average velocity for the entire trip?

3. Lou Brock stole bases by achieving a full sprint speed of 30 ft/s after only 3 steps (12 feet).
   a) What was his initial acceleration, if we assume it was constant?
   b) How long did it take to steal second base? Assume a total distance of 80 ft and zero acceleration after the first 12 ft.

4. You've landed on the planet Meetzorb. You toss a Meetzorbian rock upward with speed 12 m/s. It returns to your hand 6 seconds later. What is the value of "g" on Meetzorb and how high did the rock go?

5. Captain Bligh wishes to put a hole at water level in the good ship Lollipop with his cannon. The cannon is 16 ft above the water and fires horizontally. How much gun powder (1 gm for every 1.0 ft/s velocity) does he need if the Lollipop is 300 ft away?

6. A quarterback throws a pass with speed 50 ft/s at 37^o from the horizontal. If the ball is released 6 ft above the ground, how far downfield will it travel before hitting the ground?