Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal numbers of moles of gas. The gram-molecular mass of He is twice that of H2 . Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
a. The total internal energy of the hydrogen is the same as that of the helium.
b. The total internal energy of the hydrogen is 1.4 times that of the helium.
c. The total internal energy of the helium is 1.4 times that of the hydrogen.
d. The total internal energy of the hydrogen is 1.67 times that of the helium.
e. The total internal energy of the helium is 1.67 times that of the hydrogen.
d
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In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), we expect the term fciv to be small if ________
A) most of the civilizations that have ever existed are still out and about in the galaxy B) primitive life is common but intelligent life is rare C) most habitable planets never actually get life on them D) most civilizations destroy themselves within just a few hundred years of arising
Mary passes Mike from behind while bicycling. As she passes him,
A) the two have different speeds and different velocities. B) the two have the same speeds and the same velocities. C) Mike turns into a hippopotamus. D) the two have the same speeds but different velocities. E) the two have different speeds but the same velocities.
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south
The proper order of the layers of a generic atmosphere from lowest altitude to highest is
A) troposphere, stratosphere, exosphere, thermosphere. B) troposphere, stratosphere, thermosphere, exosphere. C) stratosphere, troposphere, exosphere, thermosphere. D) stratosphere, troposphere, thermosphere, exosphere. E) none of the above