Astronomers refer to the beginning of the Universe as the _______________
Fill in the blank(s) with correct word
big bang
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An X-ray telescope placed on the surface of Earth can detect X-rays that are emitted from a distant astrophysical source.
Answer the following statement true (T) or false (F)
A refrigerator has a coefficient of performance of 4. If the refrigerator absorbs 30 cal of heat from the cold reservoir in each cycle, the heat expelled (in cal) into the heat reservoir is
A. 40.5 B. 37.5 C. 36.5 D. 34.5 E. 22.5
A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is
A) zero. B) up the hill and equal to the weight of the car. C) down the hill and equal to the weight of the car. D) up the hill and greater than the weight of the car. E) down the hill and greater than the weight of the car.
A heat engine operating between a pair of hot and cold reservoirs with respective temperatures of 500 K and 300 K will have what maximum efficiency?
a. 60% c. 40% b. 50% d. 30%