A fluid in an insulated,flexible bottle is heated by a high resistance wire and expands.If 9 kJ of heat is applied to the system and it does 5 kJ of work,how much does the internal energy change?
A)4 kJ
B)14 kJ
C)-4 kJ
D)45 kJ

Question

Quizplus · Accepted Answer

The change in internal energy (ΔU) can be calculated using the first law of thermodynamics: ΔU = Q - W, where Q is the heat added to the system and W is the work done by the system. Here, Q = 9 kJ and W = 5 kJ, so ΔU = 9 kJ - 5 kJ = 4 kJ.

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