A Carnot refrigerator has a coefficient of performance of 2.5. The refrigerator consumes 50 W of power. How much heat is removed from the interior of the refrigerator in 1 hour?
A) 720 kJ B) 180 kJ C) 450 kJ D) 7.5 kJ E) 72 kJ
C
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On a PV diagram where pressure is in atmospheres and V is in liters the area is measured in liter- atmospheres. What is the number of Joules in 1.00 liter-atmosphere?
A. 101.3 B. 83.1 C. 65.2 D. 22.4 E. 15.7
Which of the following statements is true of the rings of Jupiter?
A) They must be made of icy material. B) They look bright when illuminated from front. C) They look light and bluish. D) They must be continuously resupplied with new dust.
Zero Kelvin is also known as ________.
A. thermal equilibrium B. the boiling point of water C. an ideal blackbody D. the freezing point of water E. absolute zero
A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. What is the size and orientation of the image?
A. 4.0 cm, inverted B. 4.0 cm, upright C. 8.9 cm, inverted D. 8.9 cm, upright E. 25 cm, upright