Blocks with light springs (q31)

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Homework Help Overview

The discussion revolves around a physics problem involving blocks and light springs, focusing on energy transfer and momentum conservation. Participants are seeking guidance on how to approach the problem and clarify their understanding of the concepts involved.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants express uncertainty about how to begin the problem and seek initial guidance. There are discussions about energy transfers and the application of conservation laws, particularly momentum and energy.

Discussion Status

Some participants have offered suggestions regarding the use of conservation principles, while others are still trying to articulate their understanding and gather sufficient information to proceed. There is a mix of attempts to clarify concepts and explore different interpretations of the problem.

Contextual Notes

Participants mention the need for specific starting points and express a desire for hints rather than complete solutions, indicating a focus on learning and understanding the underlying principles.

jack1234
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Blocks with light springs (q31)

Hi, I have not idea how to do the following problem(all attempts failed):
http://tinyurl.com/28lahv

Can somebody help?
 
Last edited:
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It might help if you showed what you have tried. See https://www.physicsforums.com/showthread.php?t=94379
 
Sorry, I am not sure how to start the question with...just hope anyone can shed me some light.
 
OK. As a first step can you describe the energy transfer(s) that happen?
 
Use conservation of energy and conservation of momentum. remember the spring is light, so just assume its mass is 0.
 
Got it, thanks:)
Followed is the working:
By conservation of momentum
0=3*2+2*v
v=3m/s
Potential energy stored in the spring
= sum of total kinetic energy
=0.5*2*(3)^2+0.5*3*(2)^2
=15J
 

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