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BenRW
  • Member for 10 years, 7 months
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Is it possible to move a specific metal with a magnet?
This is kinda too vague to say either way. Assuming you mean a magnetic metal and a static field, sure: you could glue the metal to a table, but you wouldn't be asking if that's what you meant. Non-magnetic metal? Can only move that with a non-static magnetic field, but how much force you put on each metal depends on how conductive the metal is. And so on.
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If temperature is proportional to average kinetic energy, then is the air around me actually at a higher temperature than, say, my table?
But this is starting to feel like it should be a different question, and your source of confusion is that you're using an oversimplified model of how the energy is stored and transferred (oversimplified models are where I usually trip up, so I hope I'm recognising rather than projecting).
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If temperature is proportional to average kinetic energy, then is the air around me actually at a higher temperature than, say, my table?
Consider H2O. (1) T<0°C, solid, adding energy makes everything vibrate more, it warms up. (2) T=0°C, add energy, crystal structure bonds break, temperature remains constant. (3) 0°<T<100°C, liquid, add energy molecules move faster and atoms within molecules vibrate harder (=move faster), remains liquid (ish, I'm ignoring evaporation), gets warmer. (4) T=100°C, add energy, remaining weak intermolecular bonds break, temperature remains constant. (5) 100°C<T<2045°C, add energy, molecules move faster, atoms within molecules vibrate harder (faster), gets hotter. (6) T~=2045°C, atomic bonds break.
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If temperature is proportional to average kinetic energy, then is the air around me actually at a higher temperature than, say, my table?
Likewise for the current edit "can only vibrate around fixed positions" — they're still moving fast when they vibrate. They just don't go very far before changing direction.
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If temperature is proportional to average kinetic energy, then is the air around me actually at a higher temperature than, say, my table?
Regarding current edit: "when you melted a liquid to form a gas, the gas particles had more kinetic energy than the liquid particles had had." — yes, but that's not saying all gas particles have more KE than all liquid particles, it's saying that when some specific substance transitions from liquid phase to gas phase the particles must gain KE: en.wikipedia.org/wiki/Enthalpy_of_vaporization (Caveat: it is more complicated, because something might boil due to lower pressure rather than more energy, but the comment size is limited and I've already posted an answer).
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How powerful must a gravitational wave be, to be audible to a human?
added question-mark to the end of the title, because it is a question
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