Exam3-2011spring-sample

# Exam3-2011spring-sample - SAMPLE EXAM 3 Notes: 1. Multiple...

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SAMPLE EXAM 3 Notes: 1. Multiple choice part has 14 questions and is worth 14x5=17 points 2. Handwritten section is worth 30 points 3. Equation sheet is provided after the handwritten section. It has 2 pages, you will have exactly the same equation sheet on exam (one page, double-sided print). We recommend that you make yourself familiar with equations on that sheet to save time at the exam. Please make sure you know what conditions/approximations need to be met for every equation. For example, K=mv 2 /2 is only applicable at nonrelativistic speeds. 4. The answer key to the multiple choice part is provided on a page that follows the equation sheet. 5. The solution to handwritten portion is provided at the end of that document. This sample exam is to give you a feeling of exam difficulty level. To prepare for exam go through homework problems and make sure you understand the solution, why one or the other principle is used etc. Also look at lecture. If time permits pick and solve additional problems from the textbook.

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Problem 1 (5 pts) A bullet of mass m= 38 g is fired horizontally and at a distance d= 5 cm above the axis of a cylinder of mass M= 10 kg, radius R= 11 cm and length L= 20 cm. The cylinder is initially at rest and is free to rotate on a massless axle through it's long axis. The bullet adheres to the cylinder surface as it hits it. The cylinder begins to rotate at an angular speed such that it completes one complete revolution in T= 0.211 s after catching the bullet. Calculate the initial speed of the bullet prior to impact. (The moment of intertia of a cylinder is 2 1 2 I MR = ) A. 955 m/s B. 1910 m/s C. 1105 m/s D. 865 m/s E. 745 m/s Problem 2 (5 pts) Particle 1 of mass m moving with speed v in the +x direction has an elastic collision with particle 2 of mass 3 m which was originally at rest. After the collision, particle 2 is moving in the +x direction. What is its speed? A. 2 5 v B. 1 3 v C. 2 3 v D. 1 2 v E. 2 7 v Problem 3 (5 pts) The first excited state of a particular atom in a gas is 5.2 eV above the ground state. A moving electron collides with one of these atoms, and excites the atom to its first excited state. Immediately after the collision the kinetic energy of the electron is 2 eV. What was the kinetic energy of the electron just before the collision? A) 7.2 eV B) 3.2 eV C) 2.6 eV D) 10.4 eV E) 1.6 eV Problem 4 (5 pts) Consider a system consisting of three particles: m 1 = 2 kg, 1 = < 8, -8, 14 > m/s m 2 = 3 kg, 2 = < -15, 7, -4 > m/s m 3 = 3 kg, 3 = < -28, 39, 23 > m/s What is the velocity of the center of mass of this system? A) <-14.1, 15.3, 10.6> m/s B) <-8.2, 21.2, 13.6> m/s C) <-12.2, 10.3, 10.6> m/s D) <14.4, -14.9, 13.6> m/s E) <-15, 15.4, 11,6> m/s
Problem 5 (5 pts) A chain of metal links with total mass m = 7 kg is coiled up in a tight ball on a low- friction table. You pull on a link at one end of the chain with a constant force F = 57 N. Eventually the chain straightens out to its full length

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## This note was uploaded on 04/23/2011 for the course PHYS 172 taught by Professor ? during the Spring '08 term at Purdue University-West Lafayette.

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Exam3-2011spring-sample - SAMPLE EXAM 3 Notes: 1. Multiple...

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