3_1-Clickers-Momentum and Rockets

# 3_1-Clickers-Momentum and Rockets - Taylor Chapter 3:...

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1 Taylor Chapter 3: Momentum

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2 Taylor adds up the forces on all piece “a” of a body with N pieces. If all forces are internal, he gets Ý P = F αβ β≠α α= 1 N If you wrote out all the terms in this double sum, how many would there be ? A) N B) N2 C) N(N-1) D) N! E) Other/not really sure
3 (Assume below that N-II is an experimental fact) We just showed that we can then use N-III to derive the law of conservation of momentum for systems of particles. Is the converse true? i.e.: If the law of conservation of total momentum of a system (of two particles) holds, can you derive that it MUST be the case that F 12=- F 21? A) Yes B) No C) Maybe one could, but I can’t. ..

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4 A 8Li nucleus at rest undergoes β decay transforming it to 8Be, an e- and an (anti-)neutrino. The 8Be has |p|=5 MeV/c at 90o, the e- has |p|= 6 MeV/c at 315o, what is p ν (in the form (px, py)? A) (4.2, 4.2) B) (-5,0) C) (-5,-1) D) (-4.2, 0.8) E) (-4.2, -0.8) MeV/c
5 Dear Radioactive Ladies and Gentlemen: ...I have hit upon a desperate remedy. . I admit that my remedy may appear to have a small a priori probability because neutrons, if they exist, would probably have long ago been seen, However, only those who wager can win. .. Unfortunately I cannot personally appear in Tübingen, since I am indispensable here on account of a ball taking place in Zürich. ...,Your devoted servant, W. Pauli [Translation from Physics Today, Sept. 1978] Pauli’s Desperate Remedy Dec. 4, 1930

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6 If you push horizontally (briefly!) on the bottom end of a long, rigid rod of mass m (floating in
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## This note was uploaded on 02/27/2012 for the course PHYSICS 2210 taught by Professor Stevepollock during the Spring '11 term at Colorado.

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3_1-Clickers-Momentum and Rockets - Taylor Chapter 3:...

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