You are standing on Earth's equator. Which way is Polaris, the North star?
A) 30 degrees up, due West
B) on the northern horizon
C) directly overhead
D) The answer depends on whether it's winter or summer.
E) The answer depends on what time of day (or night) it is.
B
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The principal difference between a gas and a plasma has to do with
1) the kinds of elements involved, 2) interatomic spacing, 3) electrical conduction, 4) fluid pressure, 5) the proportion of antimatter, while the principal difference between a liquid and a gas has to do with 6) the kinds of elements involved. 7) interatomic spacing. 8) electrical conduction. 9) fluid pressure. 10) the proportion of antimatter.
Molecular Speeds: The absolute temperature of an ideal gas is directly proportional to which of the following quantities?
A. the average speed of its molecules B. the average momentum of its molecules C. the average kinetic energy of its molecules D. the mass of its molecules E. It is proportional to all of these quantities.
Why is the absorption spectrum of atomic hydrogen different from that of helium?
A. There is usually more hydrogen than helium in stars. B. Hydrogen atoms have a lower mass, and are therefore faster. C. The energy differences between orbitals in hydrogen are different from those in helium. D. Helium has more neutrons than hydrogen.
A car starts out when the air temperature is 288 K. The air pressure in the tires is 500 kPa. After driving a while, the temperature of the air in the tires increases to 298 K
What is the pressure in the tires at that point, assuming the volume remains constant? A) 129 kPa B) 483 kPa C) 507 kPa D) 517 kPa E) 532 kPa