The type of smog that forms in Los Angeles is called ______________ smog
Fill in the blank(s) with correct word
photochemical
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What is a lava dome?
What will be an ideal response?
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
Light Travel Time: Because of the finite speed of light, we see more distant objects as they were in the past. For example, we see the star Alpha Centauri as it was 4.4 years ago, and the Andromeda Galaxy as it was 2.5 million years ago
Astronomers are often asked how we know that these objects still exist when we look at them in the night sky. How would you try to answer this question?
A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. If gm is the free-fall acceleration at the surface of Mars, what is the free-fall acceleration at the location of the satellite?
A) gm/9 B) 0 C) gm D) gm/3 E) gm/16