just question 2

1. A 20cm thick slab is initially at a uniform temperature of 22C. Its physical properties are: =2000kg/m3,k=0.725W/mC,Cp=850J/kgC At a point in time, both surfaces of the slab are brought to a temperature of 100C. Estimate the temperature at a point 2cm from the surface of the slab after 2 minutes have elapsed. MAKE SURE TO USE AN APPROPRIATE METHOD FOR THIS CASE. You may assume that the temperature in regions of the slab far from the surface is still at 22C. 2. The same 20cm thick slab as in question \#1 is initially at the same uniform temperature of 220C. Its physical properties are: =2000kg/m3,k=0.725W/mC,Cp=850J/kgC (all same as \#1) At a point in time, both surfaces of the slab are brought in contact with a fluid with a temperature of 1000C. The convection coefficient is h=145W/m2C. Estimate the amount of time required for the temperature to reach 50C at the center of the slab. MAKE SURE TO USE AN APPROPRIATE METHOD FOR THIS CASE