A sample of cobalt (specific heat of Co = 0..418 J/g˚C) at 200.0˚C is dropped into a calorimeter containing 50.0 mL of water at 21.1˚C. The final temperature of the water/cobalt mixture was 67.1˚C. What was the mass of the sample of cobalt?

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.