The first "generation" of strongly interacting particles consists of
A) the up quark and the down quark.
B) the proton and the neutron.
C) the up quark and the gluon.
D) the up quark and the electron.
E) the electron and the electron neutrino.
A
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Stellar parallax is the apparent
A) shift in position of nearby stars as the Earth moves around the Sun B) westward motion of a planet with respect to the background stars C) shift in position of nearby stars as the Sun moves about the center of the galaxy D) shift in position of nearby stars as the Earth rotates on its axis
Put one of your thumbs at arm's length in front of your face. Now focus on something in the background and look through one eye at a time. What do you notice about your thumb?
A. It appears to move more when it's closer. B. It appears to move less when it's closer. C. It appears to move the same when it's closer. D. It disappears entirely when it's closer! E. None of the above.
A certain grapefruit on Earth has a mass of one kilogram and a weight of one newton. When the grapefruit is on the moon its mass is
A) less than one kilogram. B) ten newtons. C) less than ten newtons. D) one kilogram.
Distance divided by time
A. Gerard de Vaucouleurs |
B. Georges Lemaître |
C. Hubble’s Law |
D. Edwin Hubble |
E. Velocity or Speed |
F. Ho |