Length Contraction: Two stars are at rest relative to each other. A spaceship is moving between these two stars at 0.932c relative to each star. To someone in the ship, the distance between the two stars appears to be 26.4 light-years. What is the distance between the stars in their own rest frame?
A. 72.8 light-years
B. 9.57 light-years
C. 21.1 light-years
D. 55.4 light-years
Answer: A
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Fill in the blank(s) with the appropriate word(s).
Which of the following correctly describes what we mean by a great circle on the surface of the Earth?
A) any circle whose center is at the center of the Earth B) any circle of latitude C) any circle larger than 10,000 km in diameter D) a circle of longitude
Estimate how many textbooks of 1000 pages stacked on top of each other would make a stack of books 10 feet high.
A. 60 B. 50 C. 40 D. 30 E. 20
In the formation of a cloud, moist air rises and
A) expands. B) cools. C) condenses. D) all of the above E) none of the above