A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9.0 kJ of heat is applied to the system and it does 5.0 kJ of work, how much does the internal (thermal)
Energy of the fluid change?
A) 14 kJ
B) -4.0 kJ
C) 4.0 kJ
D) 45 kJ

Question

Quizplus · Accepted Answer

The change in internal energy (ΔU) of the system can be calculated using the first law of thermodynamics, which is ΔU = Q - W, where Q is the heat added to the system and W is the work done by the system. Here, Q = 9.0 kJ (heat added) and W = 5.0 kJ (work done by the system). Thus, ΔU = 9.0 kJ - 5.0 kJ = 4.0 kJ.

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