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L12F11 - P123 F11 Lecture 12 18 Nov 2011 CENTER OF MASS...

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1 P123 F11 Lecture 12 18 Nov 2011 CENTER OF MASS MOTION & ROTATIONAL KINEMATICS REVIEW LINEAR MOMENTUM: IMPULSE OF A FORCE: (Strong force acting for short time) Impulse-Momentum Theorem CONSERVATION OF LINEAR MOMENTUM: TYPES OF COLLISIONS: LINEAR MOMENTUM CONSERVED IN COLLISIONS (When collision force >> external force) Elastic: conserved Inelastic: only is conserved Completely Inelastic: only conserved & objects stick v m p dt p d a m F ) ( 1 2 t t F J ) ( 1 2 2 1 t t F dt F J t t x x x 1 2 p p J then 0 If I F ext P P F ] [ ] [ F F I I B A B A p p p p KE P & P P t 1 t 2 t x F x F
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2 Many nuclear reactors use Li ( M = 7 m o ) to moderate ( reduce the KE ) of neutrons ( M n = m o ) produced in nuclear reactions by elastic collisions with Li nuclei.. An alternative is Na ( M Na = 23 m o ). Li is a better choice because: A. P tot is lower after n Li collision B. n has less KE after n Li collision compared to n Na collision C. P tot is higher after n Na collision D. KE of n does not change after n Na collision E. Na is better choice (trick question) i-Clicker Li n Na n - or - P final = P initial
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