Average force between baseball and bat

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Homework Help Overview

The problem involves calculating the average force exerted between a baseball and a bat during a brief contact period. It is situated within the context of mechanics, specifically focusing on concepts of momentum and force.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculation of average force using the change in velocity and the duration of contact. There is a focus on the precision of the numerical result and its acceptance by an online homework platform.

Discussion Status

Some participants have provided feedback on the precision of the calculation, suggesting that the original poster's approach is fundamentally sound. However, there is an indication that the online platform may not accept the calculated value, leading to further exploration of potential issues with the submission.

Contextual Notes

The original poster mentions that the problem is part of an online homework assignment, which may impose specific formatting or precision requirements that are under discussion.

Rachelbot12

Homework Statement


[/B]
A 0.145- kg baseball with an initial speed of 20 m/s rebounds with a speed of 36 m/s after being struck with a bat. If the duration of contact between ball and bat was 2.4 ms, what was the magnitude of the average force between ball and bat?

Homework Equations


Δ velocity=Vf-Vi
F= mass* Δ velocity/(Δ time)

The Attempt at a Solution


[/B]
Δ velocity = -36-20 = -56 m/s

mass* Δ velocity/(Δ time) = 56 m/s * 0.145 kg / .0024s
3383.333 N
 
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Hello Rachel, and welcome to PF :)

Seven digits precision is a bit much. Your calculation is just fine. Was that what you wanted to know ?
(In fact PF isn't really meant for stamp-approving homework -- I hope I don't get in trouble over this one...)
 
BvU said:
Hello Rachel, and welcome to PF :)

Seven digits precision is a bit much. Your calculation is just fine. Was that what you wanted to know ?
(In fact PF isn't really meant for stamp-approving homework -- I hope I don't get in trouble over this one...)

The problem is that it's an online homework and the website is saying it's incorrect. Thank you though!
 
BvU said:
Hello Rachel, and welcome to PF :)

Seven digits precision is a bit much. Your calculation is just fine. Was that what you wanted to know ?
(In fact PF isn't really meant for stamp-approving homework -- I hope I don't get in trouble over this one...)

Actually, I decided to try it without any decimal points and it turned out to be right. Weird. Thanks again :)
 

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