NORTHERN ILLINOIS UNIVERSITY PHYSICS DEPARTMENT Physics 253 – Basic Mechanics Fall 2014 Problem Set #9 Problem Set Due: Wed., Nov. 5, 2014 Read Lecture Notes #11 (Giancoli: Chapter 9) There will be a Quiz #3 on Friday, Nov. 7, 2014 Remember to write all answers with the proper # of significant figures Show explicitly all your work for full credit. 1. 2. 3. 4. 5. Giancoli: Problem 12 Giancoli: Problem 34 Giancoli: Problem 50 Giancoli: Problem 56 Giancoli: Problem 62 page 241 page 242 page 243 page 243 page 244 which direction? which direction? 6. Two blocks collide elastically on a frictionless surface. (a) Write down the conservation of momentum relation for this problem. (b) Write down the conservation of energy for this problem. (c) Solve the set of simultaneous equations above for the final velocities of the blocks after the collision given v1i 2.0 m/sec, v2i 2.0 m/sec, m1 0.50 kg, and m2 0.30 kg? (zero credit for just using canned formulas given in Giancoli—I expect to see your own algebra). (1.0, 3.0) 7. Three blocks each of mass m are located on a frictionless track as shown above. After block A is released it makes an inelastic collision with block B (they both stick together) and the two of them in turn collide with and stick to block C . (a) Find the final velocity of the three blocks as they move off together in terms of g and h . (solution: 2 3 gh / 2 ) (b) Find the total energy converted to heat in this entire process in terms of m , g , and h . (solution: 13 mgh )

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