How Do You Calculate the Rate of Heat Flow Outward Across a Star's Surface?

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SUMMARY

The discussion focuses on calculating the rate of heat flow outward across a star's surface, specifically a sphere with a radius of 3. The temperature distribution is defined as inversely proportional to the distance from the center, represented by the equation u = 7/(sqrt(x^2+y^2+z^2)). The challenge lies in applying Gauss's Law to determine the heat flow at the surface, where the distance from the center is consistently 3. The temperature at the center is theoretically infinite, which raises questions about the implications for heat flow calculations.

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The temperature in a star of conductivity 1 is inversely proportional to the distance from the center: u=7/(sqrt(x^2+y^2+z^2).
If the star is a sphere of radius 3, find the rate of heat flow outward across the surface of the star.

Not sure where to even start.
 
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Put the center at (0,0,0). The temp at the center is infinite (can you see why?)

What is the distance of any point on the surface to the center?
 
I understand that, the distance of any point on the surface to the center is 3 (the radius). But how do I use gauss Law or whatever?
 

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