Class Management Help Chapter 9- Linear Momentum Begin Date: 10/26 017 10:00:00
ID: 1776391 • Letter: C
Question
Class Management Help Chapter 9- Linear Momentum Begin Date: 10/26 017 10:00:00 AM--Due Date: 11/7/2017 11:59:00 PM End Date: 11/7/2017 11:59:00 PM (10%) Problem 5: A ball with an initial velocity of 5.5 m/s and mass 2.2 kg moves at an angle 50.5° above the horizontal. The ball hits a vertical wall and bounces off so that it is moving 50.5° above the horizontal, moving in the opposite direction with the same speed. See the figure. What was the magnitude of the impulse delivered by the wall, in kilogram meters per second? Grade Summary 0% 100% coso tan Submissions cotan asin0 coso Attempts remaining: (1% per attempt) detailed view atanacotan inhO cosh tanh cotanhO ODegrees O Radians Submit Hint I give up Hints:-% deduction per hint. Hints remaining:- Feedback: 1% deduction per feedback.Explanation / Answer
Vi = initial velocity = 5.5 Cos50.5 i + 5.5 Sin50.5 j = 3.5 i + 4.2 j
Vf = final velocity = - 5.5 Cos50.5 i + 5.5 Sin50.5 j = - 3.5 i + 4.2 j
m = mass = 2.2 kg
impulse is given as
I = m (Vf - Vi) = (2.2) ((- 3.5 i + 4.2 j ) - (3.5 i + 4.2 j )) = - 15.4 i
magnitude of impulse = 15.4 N