2 26 An electric heater is used in a room of total wall area 137...
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2 26 An electric heater is used in a room of total wall area 137 m to maintain a temperature of 20 C inside it when the outside temperature is 10 C The walls have three different layers materials The innermost layer is of wood of thickness 2 5 cm the middle layer is of cement of thickness 1 0 cm and the outermost layer is brick 25 0 cm The power of the electric heater will be W Assume that there is no heat loss through the floor and the ceiling The thermal conductivities of wood cement and brick are 0 125 150
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