A cubical tank of water of volume 1m^(3) is kept at a constant temperature of 65^(@)C by 1 KW heater. At time t = 0, the heater is switched off. Find the time taken by the tank to cool down to 50^(@)C, given the temperature of the room is steady at 15^(@)C. Density of water = 10^(3) kg m^(-3) and specific heat of water = 1.0 cal g^(-1)^(@)C^(-1). (Do not assume average temperature during cooling). Take 1 KW= 240 cal s^(-1).

A cubical tank of water of volume 1m^(3) is kept at a constant tempera

1.	A cubical tank of water of volume 1m^(3) is kept at a constant temperature of 65^(@)C by 1 KW heater. At time t = 0, the heater is switched off. Find the time taken by the tank to cool down to 50^(@)C, given the temperature of the room is steady at 15^(@)C. Density of water = 10^(3) kg m^(-3) and specific heat of water = 1.0 cal g^(-1)^(@)C^(-1). (Do not assume average temperature during cooling). Take 1 KW= 240 cal s^(-1).
Answer» ANSWER :`[20.64 HR]`

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