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Physics 1111 Exam III: April 2008, Exams of Physics

Clayton State UniversityPhysics

Information about exam iii for physics 1111 at a university. The exam is a closed-book exam worth 100 points, with multiple choice and numerical problems. It covers topics such as velocity, mass on a spring, moment of inertia, and torque.

Typology: Exams

Pre 2010

Uploaded on 08/04/2009

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Physics 1111 CRN 26283 Exam III Name
April 25, 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 50 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 have questions during the exam, please ask the professor.
Problem Number Possible Points Points Earned
Multiple Choice 25
Numerical 1 25
Numerical 2 25
Numerical 3 25
Total 100
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Download Physics 1111 Exam III: April 2008 and more Exams Physics in PDF only on Docsity!

Physics 1111 CRN 26283 Exam III Name April 25, 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 50 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 have questions during the exam, please ask the professor.

Problem Number Possible Points Points Earned

Multiple Choice 25

Numerical 1 25

Numerical 2 25

Numerical 3 25

Total 100

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

  1. The velocity equation for a mass on a spring is v(t) = (5. 60 m/s) cos( (^12). 6 π s t), what is the maximum displacement of the mass?

(a) 1.43 m (b) 2.45 m (c) 5.60 m (d) 21.99 m

  1. A mass oscillates on a spring. If the mass is doubled and the amplitude is doubled, then the period changes by a factor of:

(a) 1 (b)

(c) 2 (d) 4

  1. A mass is spinning on an axis. If the mass is doubled, and the angular speed is cut in half, the kinetic energy changes by a factor of:

(a) (^12) (b) 1 (c) 4 (d) 8

Circle the statements below that are false:

  1. The angular momentum of an object only depends on its mass and speed.
  2. If a sphere and a cylinder of equal mass and radii roll down one incline and up another without slipping, the cylinder will get to the top first.
  3. Torque is directly proportional to angular acceleration.
  4. A spinning mass’s angular acceleration and tangential acceleration are related through its moment of inertia.
  5. The total energy of a mass in simple harmonic motion is constant at all times.
  1. A mason with a small stack of bricks and a bucket of mortar stands on a platform with two supports underneath, one at each end. The platform has a mass of 30 kg, the worker has a mass of 110 kg, the bricks have a mass of 200 kg, and the bucket has a mass of 25 kg.

(a) If they are positioned as shown, what force must the left support be able to support? SHOW ALL WORK

(b) Assuming only one support can support all of the weight, how far from the left end should it be placed (with the other two removed) so that everything remains stationary? SHOW ALL WORK

  1. A person running at 5 m/s jumps on the edge of a merry-go-round. The person has a mass of 85 kg, the merry-go-round has a moment of inertia of I = 200 kg · m^2 and a radius of 1.5 meters.

(a) What is the angular speed of the system just after the person jumps on? SHOW ALL WORK

(b) If the system comes to rest after 30 seconds, what is its angular acceleration? SHOW ALL WORK