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Unformatted text preview: Quiet please ladies and gentlemen The lecture is about to begin n Lecture 21 in a nutshell m = Momentum = P Units kgm/s momentum is a vector 1 2 1 2 fx fx ix ix + = + p p p p Total final momentum in 2D=total initial momentum in 2D For head on elastic collisions (only) 1 2 1 2 fy fy iy iy + = + p p p p ( 29 ( 29 1 1 2 2 i f f i + = + Conservation of linear momentum: applications Rockets The expanding gas pushes the rocket Force up and down are balanced but not right left How do they work? ( 29 ( 29 ( 29 2 1.96 1 2 9.8 1.2 =  ( 29 2 2 cos 1 2 i gl =  A 40g bullet is fired horizontally with velocity of 100 m/s into a solid block of wood with mass 2kg, where it stays. The wooden block is suspended from the ceiling by a string with length 1.2m Q1. What is the angle of deviation of the string from vertical? Momentum/Energy, the ballistic pendulum Given: m1 = 0.04 kg m2 = 2 kg v 1i = 100 m/s l = 1.2 m Find: = ?...
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This note was uploaded on 04/07/2012 for the course PHYS 111 taught by Professor Dr.jackman during the Fall '07 term at Waterloo.
 Fall '07
 Dr.Jackman
 Physics, Momentum

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