For a quantity of ideal gas, which of the following is constant?
a. PTV b. P/TV
c. PT/V d. PV/T
d
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Studies have shown that the ice located in the south pole of Mars is mostly ____
a. H2O b. NO2 c. CO2 d. O2 e. FeO2
The center of our galaxy is located in the direction of the constellation of Orion
a. True b. False Indicate whether the statement is true or false
An H-R diagram for a globular cluster will show a horizontal branch, which is a line of stars above the main-sequence but to the left of the subgiants and red giants. Which of the following statements about these horizontal branch stars is true?
A) They have inert (nonfusing) carbon cores. B) Their sole source of energy is hydrogen shell fusion. C) They generate energy through both hydrogen fusion and helium fusion. D) In a particular star cluster, all horizontal branch stars have the same spectral type.
In a thundercloud the downdrafts are ________ and the updrafts are ________
A) warm; cold B) cold; warm C) fast; slow D) slow; fast