What is the impulse given the wall?

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Homework Help Overview

The problem involves a tennis ball with a specified mass and speed striking a wall at an angle and rebounding. The focus is on calculating the impulse imparted to the wall as a result of this interaction.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the impulse equation and its components, with some attempting to apply it to the problem. There are questions about the meaning of variables in the impulse equation and the need to consider momentum components.

Discussion Status

Some participants have provided insights into the relationship between impulse and momentum, while others are exploring the correct application of the impulse equation. There is an ongoing examination of the components of momentum relevant to the problem.

Contextual Notes

Participants note the importance of considering the angle of impact and rebound, as well as the need for clarity on the definitions of terms used in the impulse equation. There is also a reference to a visual aid to assist in understanding the momentum components.

RUNVS
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Homework Statement



A tennis ball of with a mass of .045 kg and speed of 25 m/sec strikes a wall at an angle of 45 degrees and rebounds with the same spped at 45 degrees. What is the impulse given the wall?

Homework Equations



I= pf-pi/t

The Attempt at a Solution



I= mv-mv/t
(.045)(25)-(-.045)(25)/1
1.125-1.125/1
I=2.25
I know the answer is 2.1, but don't know how to get it.
 
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RUNVS said:

Homework Equations



I= pf-pi/t

What do the letters stand for in this equation?
 
The letters stand for Impulse = final momentum - the initial momentum/ time
 
the impulse is the change in momentum. So the equation is
change in momentum = (change in force) / time
if I'm not mistaken.
 
Another way of writing it is:

Impulse = Force x time = change in momentum
 

Attachments

  • impulse.jpg
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