Any flow of water occurring between well-defined banks is defined by geologists as
a. a stream.
b. a meander.
c. a lake.
d. none of these.
a
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You discover a binary star system in which one member is a 15MSun main-sequence star and the other star is a 10MSun giant. Why should you be surprised, at least at first?
A) It doesn't make sense to find a giant in a binary star system. B) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable that such a system could be discovered. C) The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants. D) The two stars should be the same age, so the more massive one should have become a giant first. E) A star with a mass of 15MSun is too big to be a main-sequence star.
Under what conditions do real gasses approximate the behavior of an ideal gas?
A. high temperature and low pressure B. low temperature and low pressure C. low temperature and high pressure D. high temperature and high pressure
Length Contraction: A starship is constructed to be 100 m long in the factory. It is launched and as it coasts by Earth, it is measured to be shortened to 5.48 m long.(a) How fast, in terms of the speed of light, is it moving past Earth?(b) What length does the ship's crew measure for the ship?
What will be an ideal response?
Q1 has 50 electric field lines radiating outward and Q2 has 250 field lines converging inward. What is the ratio Q1/Q2?
a. 5 b. ?5 c. 1/5 d. ?1/5 e. 0