Metal plates are being cooled with air blowing in parallel over each plate. the average friction coefficient over each plate is given as cf = 1.33(rel)-0.5 for rel < 5 × 105. each metal plate length parallel to the air flow is 1 m. determine the average convection heat transfer coefficient for the plate, if the air velocity is 7 m/s. evaluate the air properties at 20°c and 1 atm. given: the properties of air at 20°c and 1 atm are ν = 1.516 × 10−5 m2/s, ρ = 1.204 kg/m3, cp = 1007j/kg·k, and pr = 0.7309. (round the final answer to two decimal places.)