The shapes of planetary orbits are __________
Fill in the blank(s) with correct word
ellipses
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Where does a 1 solar-mass protostar appear on an H-R diagram?
A) It is to the right of the main sequence and higher up than the Sun. B) It is to the right of the main sequence and lower down than the Sun. C) It is to the left of the main sequence and higher up than the Sun. D) Nowhere; only stars that have fusion in their cores can be shown on H-R diagrams.
Which is the longest time?
a) the time it takes for a photon to pass through the radiative zoneof the Sun b) the time it takes a photon to pass through the corona of the Sun c) one hour d) the time it takes a photon to pass from the photosphere of the Sun to the Earth e) the time it take light to traverse the convective zone of the Sun
Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to
A) 4. B) 40. C) 400. D) 4,000. F) 40,000. E) 400,000.
A candle is 32.0 cm in front of a convex spherical mirror of radius of curvature 68.0 cm. What are the image distance and the magnification, respectively?
a. –16.5 cm, + 0.515 b. –21.8 cm, – 1.94 c. –36.0 cm, + 0.242 d. –1.9 cm, + 1.94 e. 16.5 cm, – 0.515