A paddle wheel is used for stirring a liquid contained in a tank supplied 6000 kJ of work and during the stirring operation the tank lost 1500 kJ of heat to the surroundings. If the tank and liquid are considered as a system what will be its change in internal energy.
A paddle wheel is used for stirring a liquid contained in a tank supplied 6000 kJ of work and during the stirring operation the tank lost 1500 kJ of heat to the surroundings. If the tank and liquid are considered as a system what will be its change in internal energy.
First law of thermodynamics tells that
dQ=du+dW
Therefore
-1500=du-6000 \\\Rightarrow du=6000-1500 \\\Rightarrow du=4500\;kJ
So change in internal energy of the system is 4500 kJ
