# Ch9 HW2 S2008 - Ch9 HW2 S2008 4/25/08 10:33 AM Web Assign...

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4/25/08 10:33 AM Ch9 HW2 S2008 Page 1 of 3 http://www.webassign.net/v4cgikseiloff3@gatech/student.pl?h=20080425142622kseiloff3@gatech1286165155 Ch9 HW2 S2008 (Homework) KRISTIN SEILOFF Instructor: Jennifer Curtis Description Momentum and energy in collisions: Unequal masses; 2D collisions Instructions Reading: Sections 9.4-9.6 Web Assign Current Score: 22 out of 22 Due: Wednesday, March 26, 200808:35 AM EDT 1. 2/2 points | 1/4 submissions Consider a head-on collision between two objects. Object 1, which has mass m 1 , is initially in motion, and collides head-on with object 2, which has mass m 2 , and is initially at rest. Which of the following statements about the collision are true? [_] [_] If m 2 >> m 1 , then | 1 | > | 2 | [x] [x] If m 2 >> m 1 , then the final speed of object 1 is greater than the final speed of object 2. [x] [x] 1,initial = 1,final + 2,final [_] [_] If m 1 >> m 2 , then the final speed of object 2 is less than the initial speed of object 1. [x] [x] | 1,final | < | 1,initial | 2. 5/5 points | 2/4 submissions A professional pitcher throws a baseball of mass 0.155 kg at a speed of 34 m/s. The ball bounces off a wall embedded in the Earth, with very little loss of kinetic energy. This is essentially a head-on elastic collision.

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## This note was uploaded on 10/19/2009 for the course PHYSICS 2211M taught by Professor Schatz during the Spring '06 term at Georgia Institute of Technology.

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Ch9 HW2 S2008 - Ch9 HW2 S2008 4/25/08 10:33 AM Web Assign...

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