An unknown compound gave a melting point of 230oC. When the molten liquid solidified, the melting poing was redetermined and found to be 131oC. A possible explanation for this discrepancy is Group of answer choices the melting point apparatus is broken the compound is the same exact compound the compound may have undergone a chemical change

answerleaving cheese out to get moldy;

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.