Total Time: 1 hour 15 minutes Full Marks: 50 (25% of Final Grade) 2. The corner region of a large wall is shown below. The wall is made of material with (p = 2000 kg/m, cp = 70 J/kg K, k = 10 W/m K) and is at an initial temperature of 20C. All the sides of the wall are exposed to ambient air at 50C with a heat transfer coefficient (h) of 15 W/m.K. Find the temperature at a point inside the wall which is at 15 cm from all sides, i.e. (x, y z) is (15 cm, 15 cm, 15 cm), at t = 300s. Show your working steps clearly. Justify all the assumptions you make. (15 points) Z X