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Rec05_172Spring2012

# Rec05_172Spring2012 - Physics 172 Recitation 05 Spring 2012...

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Physics 172 – Recitation 05 Spring 2012 As you work on today’s problems remember that every time you use a fundamental principle you must explain clearly what physical system you are applying the principle to and which objects in the system’s surroundings are interacting significantly with the system. Problem 1. Explain briefly to your TA why you think your answers to the questions below are correct. a) At a particular instant an airplane is flying in the – x direction. At this instant the magnitude of its momentum is changing but its direction is not. Which of the quantities d | ° p | dt , d ˆ p dt , ° F ± and ° F are not zero? If a quantity is not zero, give a possible direction for it. b) At a particular instant an airplane is flying in the – z direction. At this instant the direction of its momentum is changing but its magnitude is not. Which of the quantities d | ° p | dt , d ˆ p dt , ° F ± and ° F are not zero? If a quantity is not zero, give a possible direction for it.

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Rec05_172Spring2012 - Physics 172 Recitation 05 Spring 2012...

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