A hot plate of size 30 cm x 50 cm is kept in air at 30°C. The temperature of the plate is initially at constant temperature at 200°C. Find: (i) heat transfer coefficient, (ii) initial rate of cooling...

A hot plate of size 30 cm x 50 cm is kept in air at 30°C. The temperature of the plate is initially at constant temperature at 200°C. Find: (i) heat transfer coefficient, (ii) initial rate of cooling of the plate, (iii) time to cool plate to 50°C. Given mass of plate = 15 kg, Cp= 420 J/kgK and plate has side 30 cm in vertical position.