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-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@mail.phys-l.org] On Behalf Of brian
whatcott
Sent: Friday, February 2, 2018 12:32 PM
To: phys-l@mail.phys-l.org
Subject: Re: [Phys-L] Internal Energy of Wood Taking a Bullet
On 2/2/2018 9:21 AM, Jeffrey Schnick wrote:
When you fire a bullet into a block of wood, while the bullet is embeddingitself in the wood, it is clear that the internal kinetic energy of the wood is
increasing. How about the internal potential energy of the wood? Is it
increasing because chemical bonds are broken, increasing for other reasons,
decreasing because the wood is being compacted bringing the molecules
closer together where they find themselves more strongly bound,
decreasing for other reasons, or staying the same?
_______________________________________________Shear and bending to fracture in the substrate heats it somewhat, increasing
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its temperature and increasing the local entropy. The recoil may increase its
external kinetic energy as well.
Brian W
_______________________________________________
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