What keeps the surface temperatures constant all over Venus?
a. a high level of deuterium within its atmosphere
b. a thick layer of water vapor just above the surface
c. a greenhouse effect holding in the heat
d. a slow, retrograde rotation on its axis
e. a thick atmosphere and high winds carry heat efficiently
e
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Cepheid variable stars stop pulsating when:
A) they evolve out of the instability strip of the H-R diagram. B) they enter the zero-age main sequence. C) they begin their stable lives fusing hydrogen. D) they reach the lower edge of the main sequence of the H-R diagram.
A) Explain which star is apparently brighter to you as viewed from Earth on a clear night, a star with a negative value or a star with a positive value. b) If star A has an apparent visual magnitude that is more negative than star B, which is the brighter star?
What will be an ideal response?
When the voltage across a nonohmic resistor is doubled, the current through it triples. What happens to the power delivered to this resistor?
a. This cannot be answered with the information given. b. The power decreases to 2/3 of the original amount. c. The power increases to 1.5 times the original amount. d. The power increases to 6 times the original amount.
One foolhardy day, a daring major (let's call him Tom) in the space force decides to become the first of his race to cross the event horizon of the black hole
To add to the drama, he decides to go in wearing only a thin space suit, which offers no shielding against radiation, no cushioning against any forces, and so on. Which of the following is most likely to kill him first (or at least cause significant damage)? (Hint: The key word here is first. Be sure to consider the distances from the black hole at which each of the noted effects is likely to become damaging.) A) the crush of gravity at the singularity embedded within the black hole B) the tidal forces due to the black hole C) the strong acceleration as he descends towards the black hole D) the X-rays from the accretion disk E) the sucking force from the black hole, which will cause his head to explode