haushofer's latest activity
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haushofer reacted to PeroK's post in the thread I Is calling fictitious forces "not real" just about terminology? with
Like.
I broadly agree. Perhaps this is one of the great things about studying mathematics. That you learn to think in terms of the... -
haushofer replied to the thread I Simple thought experiment with Stefan-Boltzmann law: energy.Never mind, solved it. This was serious confusion :-p
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haushofer replied to the thread I Simple thought experiment with Stefan-Boltzmann law: energy.I guess my confusion is this: why would the hotter sphere cool down a bit by absorbing radiation from the colder sphere?
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haushofer replied to the thread I Is calling fictitious forces "not real" just about terminology?.I think every teacher knows that words are really important in physics. Physics is also about interpretation, or "ontology", or...
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haushofer reacted to A.T.'s post in the thread I Is calling fictitious forces "not real" just about terminology? with Like.
Physists of the past have been brilliant at describing nature using math, but terrible at choosing the right words for it. Both naming...
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haushofer replied to the thread I Is calling fictitious forces "not real" just about terminology?.My 2 cents: if you're being pushed in your chair because the train accelerates, it's a frame-independent fact that an engine makes the...
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haushofer replied to the thread I Simple thought experiment with Stefan-Boltzmann law: energy.@kuruman I only see now your comment about absorption, emission and minus signs. But isn't the whole point that if (say) sphere 1...
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haushofer replied to the thread I Simple thought experiment with Stefan-Boltzmann law: energy.Maybe I should write $$P_1'=P_1+c \cdot P_2 \ \ \ , \ \ \ P_2'=P_2+c \cdot P_1$$ to find the new equilibrium, so without the accents...
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haushofer replied to the thread I Simple thought experiment with Stefan-Boltzmann law: energy.Positive; it's a ratio of surfaces. But I agree this is the tricky equation. I reasoned that sphere 1 receives (hence the + sign) an...
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haushofer reacted to A.T.'s post in the thread B Inclined treadmills and Galilean Invariance with Like.
This has been discussed many times on PF, and will likely come up again, so the video might come handy. Previous threads...
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haushofer posted the thread I Simple thought experiment with Stefan-Boltzmann law: energy in Classical Physics.Dear all, in an encounter of an infamous claim by Gerlich and Tscheuschner that the Greenhouse effect is inconsistent with the 2nd law...
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haushofer replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.Yes.
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haushofer replied to the thread B Need help understanding particle physics and quantum physics.It's turtles all the way down.
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haushofer replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.I don't understand what that equation says.
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haushofer replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.1) No, not necessarily; look e.g. at the definition of the covariant derivative. A partial derivative is not a tensor under gct's, and...