exam2008 - PHYS 131 MIDTERM October 31st, 2008 The exam...

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Phys 131 Midterm, Oct 31 st , 2008 PHYS 131 MIDTERM October 31 st , 2008 The exam comprises two parts: 8 short-answer questions, and 4 problems. Calculators are allowed, as well as a formula sheet (one-side of an 8½” x 11” sheet) of your own making. Answer all the short-answer questions with a few words or a phrase, but be concise, please! For the problems, your grade will be calculated with the best three problems . Show your work. The short answer problems are worth two points each, and the problems are worth 10 points each. Put all answers in the red and white answer booklets provided; you may keep this exam. Good luck ! Short answer questions (answer all): you should not need to do any calculations for these questions. Answer in a few words, a short phrase, or a simple sketch. 1) [2 pts] a) a system of particles is known to have zero kinetic energy. What can you say about the momentum of the system? b) A system of particles is known to have zero momentum. What can you say about the kinetic energy of the system? 2) [2 pts] You drop a ball from a high balcony and it falls freely (and there’s no air resistance). Does the ball’s kinetic energy increase by equal amounts in equal times, or by equal amounts in equal distances? Explain. 3) [2 pts] Two drivers are on a highway at the same speed, side by side. At the same instant, they each see an obstacle on the highway and start to brake (ignore reaction
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This note was uploaded on 09/25/2011 for the course PHYS 131 taught by Professor Bennewitz during the Spring '07 term at McGill.

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exam2008 - PHYS 131 MIDTERM October 31st, 2008 The exam...

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