Question: A 1 0 mm thick copper sheet is initially at 4 0 0 K and then cooled in air of 3 0 0 K and

A 10 mm thick copper sheet is initially at 400 K and then cooled in air of 300 K and h=20
Wm2*K. Assuming the properties of the sheet to be k=397Wm*K,=8900kgm3, and c=
385Jkg*K, what is the time constant for the cooling process?
A 1 0 mm thick copper sheet is initially at 4 0 0

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