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).(adsbygoogle = window.adsbygoogle || []).push({});

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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Need help on Calculus/Physics problem

**Physics Forums | Science Articles, Homework Help, Discussion**