Consider a hot automotive engine, which can be approximated as a 0.5-m-high, 0.40-m-wide, and 0.8-m-long rectangular block. the bottom surface of the block is at a temperature of 100°c and has an emissivity of 0.95. the ambient air is at 20°c, and the road surface is at 25°c. determine the rate of heat transfer from the bottom surface of the engine block by convection and radiation as the car travels at a velocity of 80 km/h. assume the flow to be turbulent over the entire surface because of the constant agitation of the engine block.