Question: A thin, circular disk of radius 5 whose upper lower surfaces are insulated is initially at the temperature u ( r , 0 ) =

A thin, circular disk of radius 5 whose upper lower surfaces are insulated is initially at the temperature u(r,0)=f(r). If the temperature at the circumference of the disk is suddenly raised changed to 0, and maintained at that value, find the temperature of the disk u(r,0).
A thin, circular disk of radius 5 whose upper lower surfaces

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