I am preparing for GATE(Chemical). I need the answer of this question part 2 (question 54) as I am not able to find the mistake in my logic.
I have applied the logic here as:
Initial energy stored in the system = energy stored in 1st tank when valve is closed + energy stored in 2nd tank when valve is closed = (6000X10X6)+(2000X10X2) = 400,000 J When height in both tanks reaches 4 m, flow stops. Thus, final energy stored in the system = (4000X10X4)+(4000X10X4)=320,000 J Thus, energy loss= 400,000-320,000=80,000 J