A balloon has an initial volume of 0.000 5 m3. The air both inside and outside of the balloon is at 0.1 MPa. Defining the air in the balloon as your system, calculate (in joules) the expansion work when the balloon volume is increased to 0.001 5 m3.
A. -100 J
B. 100 J
C. 101 kJ
D. -101 kJ
E. 1 kJ
A. Correct. Using the “PdV” equation you can calculate that 100 joules of energy were transmitted to the surroundings.
B. Incorrect. Review the expansion/contraction work equation paying particular attention to the sign convention we establish in Section 1.4.3.
C. Incorrect. Review the problem statement and your calculations, paying particular attention to decimal points.
D. Incorrect. Review the problem statement and your calculations, paying particular attention to decimal points and signs.
E. Incorrect. Check your calculations. You are off by an order of magnitude.
You might also like to view...
The phrenic nerves arise from the
A) cervical plexus. B) thoracic plexus. C) lumbar plexus. D) sacral plexus. E) brain.
A technician goes on a heat pump service call and finds the compressor is extremely hot and the suction line is also hot. What is the problem?
What will be an ideal response?
Technician A says that horn frequency can range from 1,800 to 3,550 Hz. Technician B says that most horn circuits use a relay and the current through the relay coil is controlled by the horn button. Who is right?
A) Technician A only B) Technician B only C) Both A and B D) Neither A nor B
The slope control affects:
A) The pinch effect B) Number of short-circuits per second C) Shape of the wave D) None of the above