What encouragement for life on Mars came from the Global Surveyor?
A) The ice of the south polar cap is water, not dry ice.
B) spectral evidence for chlorophyll
C) Hellas has a lake of salt water in its bottom.
D) The face on Mars is an artificial construct.
E) strong photographic evidence for flowing and standing water on Mars in the past
E
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Several resistors are connected in parallel. Which of the following statements are correct? Choose all that are correct
1.The equivalent resistance is greater than any of the resistances in the group. 2.The equivalent resistance is less than any of the resistances in the group. 3.The equivalent resistance depends on the voltage applied across the group. 4.The equivalent resistance is equal to the sum of the resistances in the group. 5.None of those statements is correct.
A spectral line produced in the atmosphere of a star may be seen as broad whereas interstellar _______________ lines are very narrow
a. absorption b. continuous c. emission d. All of the other choices are correct.
In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle ? relative to the direction of its initial velocity and body 2 at angle ?. The sine of the sum of ? and ?, sin(? + ?), is equal to
A. 0. B. 0.500. C. 0.707. D. 0.866. E. 1.00.
Which of the following systems is most likely to contain a black hole?
A) an x-ray binary in which the unseen companion has a mass 2 MSun B) an x-ray binary in which the unseen companion has a mass 10 MSun C) an x-ray binary that undergoes frequent x-ray bursts D) a binary system in which novae have been observed to occur E) a system that has recently undergone a white dwarf supernova