A cylindrical block has a mass of 435g. It's length is 5.0cm. Calculate the area of cross section of the block if the density of its material is 8.7g/cm³
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Answer:
166.36
Explanation:
A cylindrical block of length 0.4m and area of cross-section 0.04 m2 is placed coaxially on a thin metal disc of mass 0.4 Kg and the same cross-section. The upper face of the cylinder is maintained at a constant temperature of 400K and the initial temperature of the disc is 300K. If the thermal conductivity of the material of the cylinder is 10 watt/m-K and the specific heat of the material of the disc is 600 J/kg.K, how long will it take for the temperature of the disc to increase to 350K? Assume, for purpose of calculation, the thermal conductivity of the disc to be very high and the system to be thermally insulated except for the upper face of the cylinder.
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