Physics 141, Final Exam

December 19, 2006, 4.00 pm - 7.00 pm

 

Do not turn the pages of the exam until you are instructed to do so.

 

Exam rules: You may use only a writing instrument and the equation sheet while taking this test.  You may not consult any calculators, computers, books, nor each other.

 

1.     Answer the multiple-choice questions (problems 1 – 10) by marking your answer on the scantron form.  For each multiple-choice question (problems 1 – 10), select only one answer.  Questions with more than one answer selected will be considered incorrect.  If your student ID is not listed properly on the Scantron form, the form will not be processed and you loose points for all multiple-choice questions.

2.     The analytical problems (11 – 17) must be answered in three blue exam booklets.  You must answer problems 11 and 12 in blue booklet # 1, problems 13 and 14 in blue booklet # 2, and problems 15, 16, and 17 in blue booklet # 3.  If you do not follow this convention there is no guarantee that the problems that appear in the wrong booklet will be graded.

3.     The answer to each analytical problem must be well motivated and expressed in terms of the variables used in the problem.  You will receive partial credit where appropriate, but only when we can read your solution.  Answers that are not motivated will not receive any credit, even if correct.

4.     At the end of the exam, you must hand in the blue exam booklets, the scantron form, and the exam.  All items must be clearly labeled with your name and student ID number.  If any of these items is missing, we will not grade your exam, and you will receive a score of 0 points.

5.     You are not allowed to leave the exam room until 5.30 pm.

 

Name:  __________________________________________________

 

ID number:  ______________________________________________

 

Recitation Day/Time:  ______________________________________


Useful Relations:

 

 

 

 

 

 

 

 

 

 

 

 

 

Moments of inertia of various objects of uniform composition.

 

 

 

Good luck!

Problem 1 (2.5 points)

A

B

C

D

E

 

Match the pictures of the ball parks shown above to the team names listed below.

1.     Yankees

2.     White Sox

3.     Mets

4.     Cubs

5.     Red Sox

ABCDE =

1.     12345

2.     21453

3.     21534

4.     31542

5.     31254

6.     42351

 

Problem 2 (2.5 points)

The Figure on the right shows various possible trajectories of an object launched from the surface of the earth.  What can you say about the total energy of the object for the various trajectories shown in the Figure?

1.     Eelliptical trajectory > 0 J, Ehyperbolic trajectory = 0 J, and Eparabolic trajectory < 0 J.

2.     Eelliptical trajectory > 0 J, Ehyperbolic trajectory < 0 J, and Eparabolic trajectory = 0 J.

3.     Eelliptical trajectory = 0 J, Ehyperbolic trajectory > 0 J, and Eparabolic trajectory < 0 J.

4.     Eelliptical trajectory = 0 J, Ehyperbolic trajectory < 0 J, and Eparabolic trajectory > 0 J.

5.     Eelliptical trajectory < 0 J, Ehyperbolic trajectory = 0 J, and Eparabolic trajectory > 0 J.

6.     Eelliptical trajectory < 0 J, Ehyperbolic trajectory > 0 J, and Eparabolic trajectory = 0 J.

 

Problem 3 (2.5 points)

Two satellites A and B of the same mass are going around Earth in concentric orbits.  The distance of satellite B from EarthÕs center is twice that of satellite A.  What is the ratio of the centripetal force acting on B to that acting on A?

1.     1/8

2.     1/4

3.     1/2

4.     1/Ã2

5.     1