Question: Three casting of same weight and material are to be produced. Shapes of the three casting are: cube, sphere and cylinder. Find the cooling time

Three casting of same weight and material are to be produced. Shapes of the three casting are:
cube, sphere and cylinder. Find the cooling time ratio in all these cases (cube/sphere,
sphere/cylinder, and cube/cylinder). Assume the cylindrical shaped casting have length to radius
ratio of 0.5. The top and bottom face of cube, and the top hemisphere surface of sphere are
insulated.

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