Calculate Kinetic Energy in Elastic and Non-Elastic Collisions

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Homework Help Overview

The discussion revolves around calculating the kinetic energy transformed into heat during a collision between two spheres, one of which is initially at rest. The problem involves both elastic and inelastic collision scenarios, with participants exploring the implications of each type on energy transformation.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss the calculations of kinetic energy before and after the collision, questioning the nature of the collision (elastic vs. inelastic) and its impact on energy transformation. Some express confusion regarding the professor's remarks about the solution being non-zero in an elastic collision context.

Discussion Status

The discussion is ongoing, with participants sharing their calculations and interpretations. Some confirm their results align with the original poster's findings, while others express uncertainty about the nature of the collision and its implications for energy loss. There is no explicit consensus on the correct interpretation of the problem.

Contextual Notes

Participants note the potential for miscommunication regarding the type of collision, as well as the implications of the professor's comments on the problem's setup. There is also mention of the context being a significant exam, which may heighten the stakes of the discussion.

EPhoenix
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NONElastic Collision

Homework Statement



One sphere collides with other sphere that has speed of u2 = 0... Both spheres have same mass (m1 = m2 = 0.3 kg)... After collision first sphere has speed of v1 = 0.6 m/s, second sphere v2 = 1.1 m/s ... How much of kinetic energy has been transformed into heat

Homework Equations



Ek= (m1 * u1 ^2) / 2

m1u1 + m2u2 = m1v1 + m2v2


The Attempt at a Solution



from second formula i got u1 = 1.7 m/s

and after doing Ek = Ek1 + Ek2 + heat,

heat = Ek - Ek1 + Ek2
heat = 0.2 J



Can anybody confirm this...7
 
Last edited:
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EPhoenix said:

Homework Statement



How much of kinetic energy has been transformed into heat

If the collision is elastic, as you say in the title, you don't need any more data to answer this question.
 
yeah i know... elastic collision do not transfer heat and stuff...

so it will be 0

BUT proffesor told my GF (she took that exam) that there is solution and it's not 0

dunno how, but I guess then he meant nonelastic but wrote elastic...
 
Here... I will edit it...
 
Well if the collision is inelastic, I get the same answer as you do, to 2 sig fig. As long as it isn't a trick question!
 
If it was for me, i wouldn't ask here... but this is girls be or not be exam...

Any more thoughts?
 

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