2009 1 termino 1 parcial.pdf - SOLUCION DEL EXAMEN PARCIAL...

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SOLUCION DEL EXAMEN PARCIAL DE FISICA A, I TERMINO 2009 – 2010 DESARROLLADO POR VÍCTOR HUGO VELASCO GALARZA INSTITUTO DE AYUDA POLITECNICA Quisquís 1020 entre Avenida del Ejército y García Moreno. 2282705/086412883 1. Una partícula se mueve a lo largo del eje de las x con una aceleración proporcional al tiempo s m t a 30 = . Encuentre la posición y la velocidad instantánea en un instante seg t 15 = si sabemos que la partícula parte del reposo desde la posición i ˆ 5 - ( 29 ( 29 s m v v t v dt t dv dt dv a t v v 3375 15 15 15 30 2 2 0 0 0 = = = = = = ( 29 m x x t x t x dt t dx dt dx v t x 16870 5 15 5 5 5 5 5 15 3 3 3 0 2 5 = - = - = = + = = - 2. La rapidez de una partícula que se mueve en una circunferencia horizontal de m 2 de radio aumenta a razón de [ ] 2 3 s m . En cierto instante la magnitud de la aceleración total de la partícula es [ ] 2 5 s m . En ese instante, calcule la aceleración centrípeta y su rapidez instantánea. 2 2 2 2 2 2 2 2 4 3 5 s m a a a a a a a a c c t c c t = - = - = + = ( 29 s m v v R a v R v a c c 83 , 2 2 4 2 = = = =
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SOLUCION DEL EXAMEN PARCIAL DE FISICA A, I TERMINO 2009 – 2010
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