Suppose that Mars were located at the same distance from the Sun as Earth, but was otherwise the same. Would it still be colder than Earth? Why or why not?
A) yes, because Mars has fewer clouds than Earth
B) yes, because Mars has a much weaker greenhouse effect than Earth
C) yes, because Mars has less gravity than the Earth
D) no, because with the same distance from the Sun, the two planets would have the same temperature
B) yes, because Mars has a much weaker greenhouse effect than Earth
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Modern telescopes are capable of seeing bright galaxies up to about
A) 1 million light-years away. B) 10 million light-years away. C) 1 billion light-years away. D) 10 billion light-years away. E) 1 trillion light-years away.
A 200 N box is pushed up an incline that is 5.00 m long and rises 1.00 m. The incline has a coefficient of kinetic friction of 0.200. The work done by the pushing force is
A. 475 J. B. 422 J. C. 356 J. D. 300 J. E. 396 J.
What is the source of luminosity for protostars that have not yet become hot enough for fusion in their cores?
A) light absorbed from nearby stars B) energy released by infalling matter C) fusion in their low-density outer layers D) fission from concentrated radioactive elements
A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly above the fish? (For water, n = 1.33.)
A. 50 B. 60 C. 40 D. 70 E. 110