Why was the Martian meteorite ALH84001 singled out for intense study?
A) it is the only Martian meteorite that has even been discovered
B) the meteorite appeared to be giving off methane gas
C) it is a very young rock originating from the Tharsis region
D) it is a very old rock, dating back from the time when Mars probably had liquid water on its surface
D
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Ideal Gas Law: A 20.0-L pressure vessel holds 2.00 mol of oxygen at 30°C. What is the pressure inside the vessel? (R = 8.31 J/mol ? K)
A. 101 Pa B. 101 kPa C. 1.01 MPa D. 2.52 MPa E. 252 kPa
A mass is suspended vertically from a spring so it is at rest at the equilibrium position. The mass is pulled straight down to an extension x and released so that it oscillates about the equilibrium position. The acceleration of the mass is zero when the mass is
A. at its maximum upward travel. B. at the equilibrium point. C. at its maximum lower travel. D. somewhere between the equilibrium point and maximum extension.
When water freezes, the entropy of the water
A) increases. B) decreases. C) does not change. D) could either increase or decrease; it depends on other factors.
If three samples have the half-lives listed below, which is the most radioactive?
A) a sample with a half-life of 20 minutes B) a sample with a half-life of 20 hours C) a sample with a half-life of 20 years D) a sample with a half-life of 20 million years E) none of the above