1.12 You've experienced convection cooling if you've ever extended your hand out the window of a moving vehi- cle or into a flowing water stream. With the surface of your hand at a temperature of 30C, determine the con- vection heat flux for (a) a vehicle speed of 40 km/h in air at -8C with a convection coefficient of 40 W/m K and (b) a velocity of 0.2 m/s in a water stream at 10C with a convection coefficient of 900 W/m. K. Which condition would feel colder? Contrast these results with a heat flux of approximately 30 W/m under normal room conditions.