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A steel hot-water tank of cylindrical shape has an inside diameter of 0.600 m and inside...

A steel hot-water tank of cylindrical shape has an inside diameter of 0.600 m and inside height of 1.40 m. The tank is enclosed by a 5.00 cm thick insulating layer of glass wool whose thermal conductivity is 0.0350 W / (m·K). The insulation is covered by a thin sheet metal skin. The steel tank and the sheet metal skin have thermal conductivities that are much greater than that of the glass wool. How much electrical power (W) must be supplied to this tank in order to maintain the water temperature at 75.0°C when the external temperature is 1.0°C?

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