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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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In one of Linus Pauling's books he poses a problem on how much the temperature of 1kg of water will rise as it travels from the top of Niagra Falls to the bottom. My question is does the temperature rise? I thought the loss of potential energy was transferred into kinetic energy, not thermal. Can someone clarify?
The temperature does rise. The first law of thermodynamics states that "Work is heat, and heat is work". You'll notice that if a body moves with a high speed, it becomes hotter. Thermal energy is, after all, the kinetic energy of the particles inside the body. So, when kinetic energy increases, thermal energy does too.
I thought alot of the heat was as a result of collisions with the air molecules. So the energy is both kinetic and thermal?

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Yups. Air resistance also heats it up, but very slightly.
So as an object approaches the speed of light and it's energy grows larger and larger, the object's temperature is growing very large as well?
Like not a particle tending toward the speed of light, but a rigid body.
Well, that is not possible, but assuming that it is, yes, the temperature will grow too
Okay. Thank you. You seem very knowledgeable when it comes to physics.
Well, Physics is my favourite subject, but I am still in the process of learning it. ;)
It's mine too. Is that what you're majoring in?
lol, I am still a high school student!
That's ridiculous. In a good way. I've thought you were a college student!
During the fall, the PE will be converted to macroscopic kinetic energy, and the temperature of the water will remain unchanged. But when the water crashed at the bottom, the macroscopic KE is transformed into microscopic KE. This increase in ยต.ic KE produces the temperature rise.

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