Thermodynamic Devices: A refrigerator has a performance coefficient (COP) of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle.(a) How much work is done on the gas in each cycle?(b) How much heat is exhausted into the hot reservoir in each cycle?
What will be an ideal response?
(a) 6.91 J (b) 14.9 J
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Which of the following statements best describes the exclusion principle?
A) If a particle has a precisely defined position, it is excluded from having a precisely defined momentum. B) The laws of quantum mechanics are excluded from applying to large objects made of many atoms. C) Two fermions cannot occupy the same quantum state at the same time. D) Two photons cannot be in the same place at the same time. E) The laws of quantum mechanics are excluded from our common sense.
A wire of a certain length, carrying a current of 2.0 A, is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N what is the length of the wire?
A) 2.0 m B) 3.0 m C) 1.0 m D) 20 m E) 40 m
Which of the following is not a presumed cause of ice ages?
A) The arrangement of continents around the globe. B) The amount of sunlight being reflected back into space. C) The geometry of Earth's rotation on its axis and revolution around the Sun. D) Volcanic eruptions blocking the sunlight with clouds.
Photosynthesis was a great step forward in the evolution of life on Earth, because with photosynthesis_____________________.
Fill the blank(s) with correct word