Homework3-F08 - Homework # 3 -help 4.11 Model: The ball is...

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Unformatted text preview: Homework # 3 -help 4.11 Model: The ball is treated as a particle and the effect of air resistance is ignored. Visualize: Solve: Using ( ) 1 1 x x x v t t = +- , ( )( ) 1 50 m 0 m 25 m/s 0 s t = +- m 1 2.0 s t ⇒ = Now, using ( ) ( ) 2 1 1 1 1 2 y y y y v t t a t t = +- +- , ( ) ( ) 2 2 1 1 2 0 m 0 m 9.8 m/s 2.0 s 0 s y = + +-- 19.6 m = - Assess: The minus sign with y 1 indicates that the ball’s displacement is in the negative y direction or downward. A magnitude of 19.6 m for the height is reasonable. 4.45. Model: The particle model for the ball and the constant-acceleration equations of motion are assumed. Visualize: Solve: (a) Using ( ) ( ) 2 1 1 1 1 2 y y y y v t t a t t = +- +- , ( ) ( ) ( ) ( ) 2 2 1 2 0 m 30 m/s sin60 4 s 0 s 9.8 m/s 4 s 0 s h = + °- +-- = 25.5 m (b) Using ( ) ( ) 2 2 top top 2 y y y v v a y y = +- , ( ) ( ) ( ) ( ) ( ) ( ) 2 2 2 2 2 top top 2 30 m/s sin60 sin 0 m /s sin 2 34.4 m 2 g 2 9.8 m/s v v g y y θ θ ° = +- ⇒ = = = (c) The x and y components are...
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This note was uploaded on 04/18/2010 for the course PHYS ? taught by Professor Zhou during the Spring '10 term at Georgia State University, Atlanta.

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Homework3-F08 - Homework # 3 -help 4.11 Model: The ball is...

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