haruspex's latest activity
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haruspex replied to the thread Heat Transfer and Time to Reach Steady State.It is in principle unless the near and far faces are perfectly insulated. The time it takes T2 to reach a particular temperature will... -
haruspex replied to the thread Jokes and a language: how does it work?.That's rather Zen, and is more pertinent to the question than jokes that depend on language, like puns and idioms. I recall this one...
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haruspex replied to the thread Heat Transfer and Time to Reach Steady State.The question is not well posed. Two pieces of information are missing: the depth of the block (into the page) the granularity of the...
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haruspex replied to the thread Great circle between two points on the Earth's surface.Just to add… ##\sqrt{1-\cos^2\phi-\sin^2\lambda}## immediately smells wrong to me. And that may be because the argument of the square...
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haruspex replied to the thread High School Why the bottom of a rolling wheel has zero velocity.To put it more rigorously, if two bodies are wholly or partly in rolling contact then at each instant a point on one body that is in...
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haruspex replied to the thread SHM amplitude and angular frequency from velocity equations.Your work looks correct, but you might be penalised for quoting too many significant figures in your answers. Given a value like...
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haruspex replied to the thread Solving an elementary trigonometric equation.Yes, but the question in post #1 is where is the error in the method. I answered that in post #2 (a sign error).
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haruspex replied to the thread Solving an elementary trigonometric equation.I agree, but… That’s not what I get at n=1.
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haruspex replied to the thread Undergrad Heat radiation in vacuum.It's how they interpret "heat flows from the hotter to the colder".
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haruspex replied to the thread Undergrad Heat radiation in vacuum.It's a misunderstanding of the second law of thermodynamics.
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haruspex replied to the thread Undergrad Heat radiation in vacuum.I prefer to describe that as being because there is less radiative gain from the sky. The outgoing radiation is the same. Yes, I know...