(Solved): 0-1 [4 marks]: Steel balls 16 mm in diameter are heated by heating to 1250 K and then slowly coolin ...

0-1 [4 marks]: Steel balls 16 mm in diameter are heated by heating to 1250 K and then slowly cooling to 300 K in an air environment for which T.=325K and h 20 W/m2.K. Assuming the properties of the steel to be k=40 W/m.K. p=7800kg/m, and c=600 J/kgK, estimate the time required for the cooling process.