Question: In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms -2 . Neglecting the heat capacity of agitator, the temperature of water (in °C) is
Options
A : 40.5
B : 34.4
C : 26.8
D : 25
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