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5 surfaces of a stainless steel cube are insulated. The remaining top surface is exposed to air at 20C, and a heat transfer coefficient

5 surfaces of a stainless steel cube are insulated. The remaining top surface is exposed to air at 20C, and a heat transfer coefficient of 5 W/m-K exists between the cube and air. If one side of the cube is 10 cm and the cube is initially at 74C find the time it will take for the bottom surface of the cube to reach 24C.

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