Avertical flat plate is used as a heating panel in a large room. the panel is square with dimensions of 1 m x 1 m. the surface of the panel is maintained at 450 k, while the walls and air in the room are at 300 k. if the panel has an emissivity of 0.9, what is the net rate of heat transferred from the panel to the room?

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj