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Unformatted text preview: Serway/Jewett: PSE 8e Problems Set Ch. 09  1 Serway/Jewett, Physics for Scientists and Engineers, 8/e PSE 8e Chapter 09 Linear Momentum and Collisions Questions & Problems Objective Questions denotes answer available in Student Solutions Manual/Study Guide 1. A car of mass m traveling at speed v crashes into the rear of a truck of mass 2 m that is at rest and in neutral at an intersection. If the collision is perfectly inelastic, what is the speed of the combined car and truck after the collision? (a) v (b) v /2 (c) v /3 (d) 2 v (e) None of those answers is correct. 2. A headon, elastic collision occurs between two billiard balls of equal mass. If a red ball is traveling to the right with speed v and a blue ball is traveling to the left with speed 3 v before the collision, what statement is true concerning their velocities subsequent to the collision? Neglect any effects of spin. (a) The red ball travels to the left with speed v , while the blue ball travels to the right with speed 3 v . (b) The red ball travels to the left with speed v , while the blue ball continues to move to the left with a speed 2 v . (c) The red ball travels Serway/Jewett: PSE 8e Problems Set Ch. 09  2 to the left with speed 3 v , while the blue ball travels to the right with speed v . (d) Their final velocities cannot be determined because momentum is not conserved in the collision. (e) The velocities cannot be determined without knowing the mass of each ball. 3. A 3kg object moving to the right on a frictionless, horizontal surface with a speed of 2 m/s collides headon and sticks to a 2kg object that is initially moving to the left with a speed of 4 m/s. After the collision, which statement is true? (a) The kinetic energy of the system is 20 J. (b) The momentum of the system is 14 kg m/s. (c) The kinetic energy of the system is greater than 5 J but less than 20 J. (d) The momentum of the system is 2 kg m/s. (e) The momentum of the system is less than the momentum of the system before the collision. 4. A 2kg object moving to the right with a speed of 4 m/s makes a headon, elastic collision with a 1kg object that is initially at rest. The velocity of the 1kg object after the collision is (a) greater than 4 m/s, (b) less than 4 m/s, (c) equal to 4 m/s, (d) zero, or (e) impossible to say based on the information provided. 5. A 5kg cart moving to the right with a speed of 6 m/s collides with Serway/Jewett: PSE 8e Problems Set Ch. 09  3Serway/Jewett: PSE 8e Problems Set Ch....
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 Spring '11
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