Comet impacts might have been a good mechanism for seeding the hot early Earth with the water and molecules of life
Indicate whether the statement is true or false
TRUE
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An ideal gas composed of helium atoms is at a pressure of 2.00 atmospheres and a temperature of 35.0 
What is the mass density? (He = 4.00u)
A. 0.534 
B. 0.488
C. 0.400
D. 0.316
E. 0.276
About how many stars has the Hipparcos mission given us accurate distance data on?
A) about 3,000, about half of what you can see with the naked eye alone B) over 6000, the visible naked eye stars and some seen in binoculars C) 60,000, those within about 100 light years of us D) a million, those with parallaxes of .005" or larger E) over 100 billion, almost every star in the galaxy
During summer, the northern polar cap of Mars is made of
A) carbon dioxide ice overlaying water ice B) a layer of carbon dioxide ice C) a layer of water ice D) water ice overlaying carbon dioxide ice
Melanie says that when a diver enters an underwater cave of height h, the pressure on her is no greater than ?Wgh. Rosalind says that if the bottom of the cave is a distance H below the water surface, the pressure on the soles of the diver's feet can reach ?WgH. Which one, if either, is correct? (The density of water is ?W.)
a. Melanie, because the roof of the cave absorbs the water pressure from above. b. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. c. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. d. Rosalind, because the pressure also depends on the density, ?c, of the material above the cave roof, so that p = ?cg(H ? h) + ?Wgh. e. Melanie, because the pressure equals p = ?WgH ? ?cg(H ? h).