Because he failed to observe stellar ________, Aristotle wrongly concluded we could not be in orbit around the Sun
Fill in the blank(s) with correct word
parallax
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A copper wire (d 5 1.5 mm) is bent around a tube of radius R 5 0.6 m. The maximum normal strain in the wire is approximately:
(A) 1.25 3 1023
(B) 1.55 3 1023
(C) 1.76 3 1023
(D) 1.92 3 1023
You discover a binary star system in which one member is a 15 solar mass main-sequence star and the other star is a 10 solar mass giant star. Why should you be surprised, at least at first?
A) The two stars should be the same age, so the more massive one should have become a giant first. B) 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. C) It doesn't make sense to find a giant in a binary star system. D) A star with a mass of 15 solar masses is too big to be a main-sequence star. E) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable.
Comet orbits all have ________ eccentricity compared to the asteroids
Fill in the blank(s) with correct word
Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force they exert on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r
What is the magnitude of the new gravitational force? A) F/16 B) F/4 C) 16F D) 4F E) F/2