Consider an opaque horizontal plate that is well insulated on its back side. the irradiation on the plate is 2500 w/m2 , of which 500 w/m2 is reflected. the plate is at 227°c and has an emissive power of 1200 w/m2 . air at 127°c flows over the plate with a convection heat transfer coefficient of 15 w/m2 ⋅ k. determine the emissivity, absorptivity, and radiosity of the plate. what is the net heat transfer rate per unit area? (hint: for net heat transfer incorporate the convective transfer of heat also)