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A paddle wheel used for stirring a liquid contained in a tank supplied 5000 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 the change in its internal energy will be
  • a)
    1500 kJ
  • b)
    3500 kJ
  • c)
    5000 kJ
  • d)
    6500 kJ
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A paddle wheel used for stirring a liquid contained in a tank supplied...
Solution:

Given, work done by the paddle wheel = 5000 kJ
Heat lost by the tank to the surroundings = 1500 kJ

The change in internal energy of the system can be calculated using the First Law of Thermodynamics.

First Law of Thermodynamics states that the change in internal energy of a system is equal to the heat supplied to the system minus the work done by the system.

ΔU = Q - W

where,
ΔU = Change in internal energy of the system
Q = Heat supplied to the system
W = Work done by the system

Substituting the given values in the above equation, we get

ΔU = 5000 kJ - 1500 kJ
ΔU = 3500 kJ

Therefore, the change in internal energy of the system is 3500 kJ, which is option (B).
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A paddle wheel used for stirring a liquid contained in a tank supplied 5000 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 the change in its internal energy will bea)1500 kJb)3500 kJc)5000 kJd)6500 kJCorrect answer is option 'B'. Can you explain this answer?
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