A 26 g piece of magnesium at 160 °C was placed in a calorimeter with 100 g of water at 25 °C. The final temperature was 40°C. What is the specific heat of iron? (The specific heat of water is 4.184 J/g°C)

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.