Homework3-F08

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

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

## 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.

### Page1 / 3

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online