# F98s(2) - Physics 4A THIRD EXAM Chapters 1 - 13 Fall 1998...

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Physics 4A THIRD EXAM Chapters 1 - 13 Fall 1998 1 Name:_________________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles which are on the last page. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. A 0.350kg block slides along a frictionless surface at 2.00m/s when it makes a head-on elastic collision with a 1.15kg block. Find the velocity of each block after the collision. Note: The algebra is very messy so you may want to just set this problem up to get most of the credit and complete the algebra later if you have time. p o = m 1 v o p = m 2 v 2 - m 1 v 1 K o = 1 2 m 1 v o 2 K = 1 2 m 1 v 1 2 + 1 2 m 2 v 2 2 The Law of Conservation of Momentum requires, m 1 v o = m 2 v 2 - m 1 v 1 . The fact that the collision is elastic means, 1 2 m 1 v o 2 = 1 2 m 1 v 1 2 + 1 2 m 2 v 2 2 . Solving the Conservation of Momentum equation for v 1 gives, v 1 = m 2 m 1 v 2 - v o . Substituting into the elasticity equation, 1 2 m 1 v o 2 = 1 2 m 1 m 2 m 1 v 2 - v o 2 + 1 2 m 2 v 2 2 v o 2 = m 2 m 1 v 2 - v o 2

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## This note was uploaded on 03/11/2012 for the course PHYSICS 204A taught by Professor Kagan during the Fall '09 term at CSU Chico.

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F98s(2) - Physics 4A THIRD EXAM Chapters 1 - 13 Fall 1998...

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