The center of mass of a binary star system is
A) the center of the most massive of the two stars.
B) the center of the least massive of the two stars.
C) the point halfway in between them.
D) the point at which the two objects would balance if they were somehow connected.
E) the average mass of the two stars.
D
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Once there was a highly intelligent turkey that had nothing to do but reflect on the world's regularities. Morning always started out with the sky turning light, followed by the master's footsteps, which were always followed by the appearance of food. Other things varied, but food always followed footsteps. The sequence of events was so predictable that it eventually became the basis of the
turkey's theory about the goodness of the world. One morning, after more than 100 confirmations of the goodness theory, the turkey listened for the master's footsteps, heard them, and had its head chopped off. Any scientific theory is modified or discarded upon discovery of contradictory evidence. The absence of absolute certainty has led some people to conclude that "facts are irrelevant—facts change.". If that is so, should we stop doing scientific research? Why or why not? What will be an ideal response?
What kind of object do we think lies in the center of the Milky Way Galaxy?
A) a black hole of about 4 million solar masses B) a gigantic x-ray binary system C) a dense cluster of young, hot stars D) an enormous collection of dark matter, explaining why we detect no light at all from the galactic center
On the autumnal equinox, the Sun sets ________.
A. south of west B. south of east C. due east D. due west E. north of east
An astronaut weighs 99.0 N on the Moon, where the acceleration of gravity is 1.62 m/ s2. How much does she weigh on Earth?
A) 16.2 N B) 61.0 N C) 99.0 N D) 600 N E) 440 N