A fluid in an insulated,flexible bottle is heated by a high resistance wire and expands.If
Of heat is applied to the system and it does
Of work,how much does the internal (thermal)energy of the fluid change?
A)4.0 kJ
B)14 kJ
C)-4.0 kJ
D)45 kJ

Question

A fluid in an insulated,flexible bottle is heated by a high resistance wire and expands.If 
Of heat is applied to the system and it does 
Of work,how much does the internal (thermal)energy of the fluid change?
A)4.0 kJ 
B)14 kJ 
C)-4.0 kJ 
D)45 kJ

Quizplus · Accepted Answer

According to the First Law of Thermodynamics, the change in internal energy (∆U) of a system is equal to the heat (Q) added to the system minus the work (W) done by the system:

∆U = Q - W

In this case, the heat added to the system is 11 kJ and the work done by the system is 7 kJ. Therefore:

∆U = 11 kJ - 7 kJ = 4.0 kJ

So the internal (thermal) energy of the fluid changes by 4.0 kJ. Therefore, the answer is A) 4.0 kJ.

A Fluid in an Insulated,flexible Bottle Is Heated by a High