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When 110 J of heat is added to a gaseous system, its internal energy increases by 40 J. What is the amount of work done?

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Important Questions on Thermodynamics

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No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy (ΔU) of this system and what type of wall does the system have?
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A refrigerator is to maintain eatables kept inside at 9 degree celsius. If the room temperature is 36 degree celsius, then what is the coefficient of performance?
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An ideal Carnot's engine works between 227° and 57°C. Find the efficiency of the engine.
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Pick out the correct statement from the following