Consider a vertical plate shown below of dimension 250 mm x 500 mm that is at Ts = 140C in a quiescent environment at T. = 20 C. For each orientation, calculate (case 1) (case 2) a) The Rayleigh number Ral for each orientation. b) The rate of heat transfer by convection from the front surface for each case. c) In the interest of minimizing heat transfer from the plate, which orientation is preferred? Why