Recent content by aiy1tm

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    Temperature Problem: Who Takes Hotter Coffee?

    No, the ice cream question runs into phase transition issues. (ie: if you don't completely melt the ice cream, it will still have a temperature less than or equal to the melting point of ice cream.) Anyway, it appears the answer to the question is the person who waited 10 minutes, then added...
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    Calculating Earth's Temperature with Sirius as Sun

    I'm a bit confused about the phrasing of the question. It is something like.. plug in the luminosity of Sirius in place of the Sun... how much does the equilibrium temperature of Earth change (to an approximation)? If so, you seem to have done the right thing. One thing to be careful about is...
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    Magnetic field due to parallelnwires

    You are correct about symmetry. You can write down the magnetic field as a function of y only in the x-y plane. Then, I suspect, you can take the derivative with respect to y (TWICE) to find the maximum in the gradient. The maximum field strength on the x-y plane is trivial by symmetry (the...
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    How to use Laplace's eqn to do this?

    Hi -- hope this isn't too late. But yes, this problem becomes most simple when you note the analogy to gauss's law the Gravitational laplace equation has. Except charge density has been replaced by mass density.
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