Kinetic energy transfer problem

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Homework Help Overview

The discussion revolves around a kinetic energy transfer problem involving two coins of different masses and velocities. The original poster describes a scenario where a lighter coin collides with a stationary heavier coin, and they seek to determine the kinetic energy transferred during this collision.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the calculation of kinetic energy using the formula E_{K}=\frac{1}{2}mv^2, focusing on the energy gained by the initially stationary coin. There are questions about discrepancies in calculated values and the importance of unit consistency.

Discussion Status

The conversation includes attempts to calculate the transferred kinetic energy and highlights a potential misunderstanding regarding unit conversions. Participants are exploring different interpretations of the problem, particularly in relation to the energy transfer in collisions.

Contextual Notes

There is mention of a reference book providing a specific answer, which raises questions about the calculations performed by the original poster. Additionally, a new scenario involving a sledgehammer introduces further considerations about energy transfer in collisions with immovable objects.

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ok i have a problem with a 0.005kg coin that has an initial velocity of 25cm/s that hits a 0.015kg coin that is at rest. atfer the collision the 0.005kg coin has a velocity of -12.5cm/s. What i have to find is the Kinetic energy transferred was. i got the final velocity for the 0.015kg coin which is 12.5cm/s but i don't know how to figure out the amt of kinetic energy transfer is can someone please help!
 
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Transferred kinetic energy is that which is gained by the coin that was initially at rest. Therefore, you can use

[tex]E_{K}=\frac{1}{2}mv^2[/tex]

to find the final kinetic energy of that coin, which, since initial [itex]E_{K}=0[/itex], is the transferred [itex]E_{K}[/itex].
 
Last edited:
but when i do that i get 1.172 for an answer but it says in my book that the answer is 1.1x10^-4J?
 
Take a look at your units...
 
I have an 8lb sledge hammer, traveling 50 mph hitting an immovable object. The energy created is Ek = 1/2 mv^2. Is the energy transfer to the immovable object the same amount?
 

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