Question: The temperature at the point ( x , y , z ) in a substance with conductivity K = 5 . 5 is u (

The temperature at the point (x, y, z) in a substance with conductivity
K =5.5 is u(x, y, z)=3y2+3z2.
Find the rate of heat flow inward across the cylindrical surface
y2+ z2=3,0 x 4.

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