Consider a cube shaped furnacc of 70 cm side length and 10 cm wall thickess madc from an insulating material (k 10kw to the inside of the furnace and the temperature of the outside is kept constant at 50 c via a cooling device. determine the temperature of the inside wall using two approaches below for the shape factors. neglect convection and radiation at inside and outside i w/m k). an electrical heater provides energy at rate of a) considering the furnace as a hollow square with 2 square end caps. b) considering the furnace as 6 walls, 12 sides and 8 corners c) compare a) and b) resuls and explain why they are same or different.