A 10 cm diameter very long, aluminum cylinder initially at 70°C is cooled in a bath whose temperature is 25°C and where the convection coeffi cient is 20 W/(m2 · K). a. What is the centerline...

A 10 cm diameter very long, aluminum cylinder initially at 70°C is cooled in a bath whose temperature is 25°C and where the convection coeffi cient is 20 W/(m2 · K). a. What is the centerline temperature aft er 1 min has elapsed? b. Suppose that a copper cylinder only 3 in. in diameter is heated in the same way. What is the convection coeffi cient required in order that the smaller cylinder centerline temperature equal that of the larger cylinder aft er the same amount of time has elapsed?