3. (30 pts.) Air at 25C is flowing over 400C hot iron ball with a velocity of 10 m/s. The diameter of the iron ball is 10 cm diameter and (o =7874 kg/m and cp = 450 J/kg-K). After a while the surface temperature of the ball drops to 300C. a. Determine the average rate of heat transfer from the ball. b. How long will it take to drop from 400C to 300C. c. Calculate the drag force. (The surface of the ball is smooth.)