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- Nov 19, 2005
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A cylinder with a sample of gas is compressed adiabatically by a piston. Which of the following statements are true?
1. The work done on the system is negative.
2. The work done by the surroundings is positive.
3. The temperature of the system increases.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Answer: C
My reasoning:
2.
U=q-w
Since the volume is compressed, the work is negative on the system. So, U=q+w? and therefore, work done by the system is positive? and how would work done by the surroundings be positive?
3.
Compressing a volume will decrease space causing more collisions, which increases the temperature.
1. The work done on the system is negative.
2. The work done by the surroundings is positive.
3. The temperature of the system increases.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Answer: C
My reasoning:
2.
U=q-w
Since the volume is compressed, the work is negative on the system. So, U=q+w? and therefore, work done by the system is positive? and how would work done by the surroundings be positive?
3.
Compressing a volume will decrease space causing more collisions, which increases the temperature.