Q2. A 6 x 6 x 6 cm insulating brick at a uniform temperature of 950 C is removed from a furnace and allowed to cool in the room (22 C). For this material: k= 0.1 kcal/m.h.C; Cp= 0.21 kcal/kgC; density of 0.4 tons/m. Heat transfer coefficient from brick to room is 100 kcal/m.h.'C. (MT-2) a) Determine quantitively if the heat transfer is limited by conduction or convection b) Find the mean temperature at the center of the brick after 30 minutes c) Calculate the time required to cool down the center mean temperature of the brick to half the value you found in part b. You can use the following relative temperature change figure IF NECESSARY 1,00 0,80 0.60 T-To Ts - To 0,20 0,00 0,00 0,50 1.00 150 2.00 2.50 3,00 3,50 4,00 kit p.p