You have observed the wobble in the velocity curves of two otherwise identical stars. Star A has a period of 6 months and Star B has a period of 1 year. What can you say about these stars?
A) It is impossible to say anything about the planets orbiting these stars.
B) Star B must have a planet like Earth.
C) Star A's planet must be closer than Star B's planet.
D) Star A's planet is more massive than Star B's planet.
C
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Which tin can will roll down an incline in the shortest time, one filled with water or one filled with ice? (Hint: water 'slides' inside the can.)
A) with water B) with ice C) both the same D) need more information
Jane has about $536 in her checking account, about $2107 in her savings account and exactly $7.62 in her purse. To the best precision possible, how much money does Jane have?
A) $2651 B) $2,650 C) $2,650.6 D) $2,650.62 E) $2,650.620
Star clusters have been observed within dark nebulae with:
A) optical movies made over decades. B) radio interferometers. C) infrared observations. D) the Chandra X-ray observatory. E) ultraviolet light creating the emission nebulae.
Which of the following geological processes has shaped the surface of the Earth?
A) plate tectonics B) volcanism C) erosion D) all of these