lec14 - Physics 140 Fall 2007 lecture #14: 23 October Ch 8...

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Announcements: exam #2 is next Thursday, 1 November, 6:00-7:30pm • covers Chapters 6-8 • practice exam on course web page under Resources link review next Monday evening, 29 Oct 182 Dennison 8:00-9:30pm Physics 140 – Fall 2007 lecture #14: 23 October Ch 8 topics: • center of mass • rockets One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one’s greatest efforts. The New Quotable Einstein , A. Calaprice, ed., Princeton Univ. Press, 2005, p. 220.
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For a pair of objects, one of mass m 1 located at r 1 and the other of mass m 2 located at r 2 , we define the center of mass position by a mass-weighted, normalized sum If the objects have velocities v i and accelerations a i (i=1,2), we similarly define the center of mass velocity as and center of mass acceleration as r com = ( m 1 r 1 + m 2 r 2 ) / ( m 1 + m 2 ) . v com = ( m 1 v 1 + m 2 v 2 ) / ( m 1 + m 2 ) a com = ( m 1 a 1 + m 2 a 2 ) / ( m 1 + m 2 ) . Center of mass: position, velocity and acceleration
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This note was uploaded on 04/03/2008 for the course PHYSICS 140 taught by Professor Evrard during the Fall '07 term at University of Michigan.

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lec14 - Physics 140 Fall 2007 lecture #14: 23 October Ch 8...

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