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
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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 -
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? -
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... -
haushofer reacted to A.T.'s post in the thread I Is calling fictitious forces "not real" just about terminology? with
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Physists of the past have been brilliant at describing nature using math, but terrible at choosing the right words for it. Both naming... -
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... -
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... -
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... -
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... -
haushofer reacted to A.T.'s post in the thread B Inclined treadmills and Galilean Invariance with
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This has been discussed many times on PF, and will likely come up again, so the video might come handy. Previous threads... -
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... -
haushofer replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.Yes. -
haushofer replied to the thread B Need help understanding particle physics and quantum physics.It's turtles all the way down. -
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. -
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...