Physics 1111 Exam II, Exams of Physics

A physics exam consisting of multiple choice and numerical problems. It includes instructions for the exam, such as the duration, worth, and rules. The numerical problems involve concepts such as force, energy, momentum, and angular displacement. Students are required to show all work and earn partial credit for correct attempts.

Typology: Exams

Pre 2010

Uploaded on 08/04/2009

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Physics 1111 CRN 53252 Exam II Name
October 22, 2008
1. Check your exam before starting and verify that it has six (6) pages.
2. This is a Closed Book Exam. Calculators and the Reference Data Pamphlet (provided by the
professor) are the only aides allowed.
3. You will have at least 75 minutes to finish the exam.
4. This exam is worth 100 points.
5. Please show all work for the numerical problems. Parital credit and propagation of error is earned
for correct work. Remember, if you cannot determine a piece of information that is necessary to
answer a follow-up question, you may assume a value and continue from there and still get P.O.E.
6. If you need more work space, write on the back of the previous page, and note that you have done
so at the bottom of the current page.
7. If you have questions during the exam, please ask the professor.
Problem Number Possible Points Points Earned
Multiple Choice 20
Numerical 1 20
Numerical 2 20
Numerical 3 20
Numerical 4 20
Total 100
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Physics 1111 CRN 53252 Exam II Name October 22, 2008

  1. Check your exam before starting and verify that it has six (6) pages.
  2. This is a Closed Book Exam. Calculators and the Reference Data Pamphlet (provided by the professor) are the only aides allowed.
  3. You will have at least 75 minutes to finish the exam.
  4. This exam is worth 100 points.
  5. Please show all work for the numerical problems. Parital credit and propagation of error is earned for correct work. Remember, if you cannot determine a piece of information that is necessary to answer a follow-up question, you may assume a value and continue from there and still get P.O.E.
  6. If you need more work space, write on the back of the previous page, and note that you have done so at the bottom of the current page.
  7. If you have questions during the exam, please ask the professor.

Problem Number Possible Points Points Earned

Multiple Choice 20

Numerical 1 20

Numerical 2 20

Numerical 3 20

Numerical 4 20

Total 100

Multiple Choice: (Circle the best answer from the choices given.)

  1. The area under a Force versus time graph is:

(a) Work (b) Spring constant (c) Acceleration (d) Impulse

  1. Two masses collide elastically causing an average force on each mass. If the change in velocity were the same, but time of the collision were twice as long, the average force would change by a factor of:

(a) 4 (b) 2 (c) (^12) (d) (^14)

  1. A 3.4 kg mass travelling at 8 m/s along the positive x-axis collides elastically with an 8 kg mass initially at rest. What is the velocity of the 3.4 kg mass after the collision?

(a) -8.00 m/s (b) -3.22 m/s (c) 3.22 m/s (d) 4.77 m/s

  1. A mass is at rest on a horizontal surface with μk and against a spring that is compressed a distance x. Upon release, the mass travels a distance d. If μk were doubled, by what factor should x change for the mass to travel the same distance?

(a) (^12) (b)

(c) 2 (d) 4

Circle the statements below that are false:

  1. Kinetic Energy is conserved in all collisions.
  2. Loss due to friction is equal to μsN · d.
  3. Momentum is always conserved in an explosion.
  4. Momentum is a vector.
  5. Impulse is equal to the average force times change in time.
  6. Impulse is equal to the change in momentum.
  1. A wheel has a string wrapped around it with a mass hanging from the string. The mass is released from rest and falls a distance of 1.2 meters in 3.4 seconds. SHOW ALL WORK

(a) If the wheel has a radius of 0.24 meters, what is the angular displacement of the wheel?

(b) What is the angular acceleration of the wheel?

(c) What is the final angular speed of the wheel?

  1. A cannon of mass 250 kg is fired at and angle of 34◦^ above the horizontal. The cannonball of mass 14 kg comes out at a speed of 28 m/s.

(a) What is the recoil velocity of the cannon? SHOW ALL WORK

(b) If the cannonball takes t = 1. 8 ms to escape the cannon, what is the magnitude of the average force exerted on the cannonball? SHOW ALL WORK