How many galaxies are there in the part of the universe we can observe?
A. 20,000-50,000.
B. 100,000-300,000.
C. 50-100 billion.
D. 50-100 million.
E. About 10,000.
Ans: C. 50-100 billion.
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An inventor claims to have designed a perpetual motion machine, a device that creates its own power. Which of the following laws best explains why a perpetual motion machine cannot work?
A) Law of conservation of energy B) Law of conservation of matter C) Newton's second law D) Newton's third law
Many of the Kuiper belt objects, including Pluto, are caught in a 3:2 resonance with Neptune
a. True b. False Indicate whether the statement is true or false
Second Law of Thermodynamics: The second law of thermodynamics leads us to conclude that
A. the total energy of the universe is constant. B. disorder in the universe is increasing with the passage of time. C. it is theoretically possible to convert heat into work with 100% efficiency. D. the average temperature of the universe is increasing with the passage of time. E. the entropy of the universe remains constant.