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

Multiple Choice

A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If $9.0 \mathrm {~kJ}$ of heat is applied to the system and it does $5.0 \mathrm {~kJ}$ 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