Which of the following particles is NOT made up of quarks? (There may be more than one correct choice.)
A) ?-meson B) electron C) proton D) neutrino E) neutron
B, D
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You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the mass of the plank
If you can stand on the end of a plank that overhangs the edge of the supporting table 1/5 its total length, how massive is the plank compared to your mass? A) 1/3 B) the same C) 2/3 D) 1 and 1/3 times E) more than 1 and 1/3 times
What makes up the interstellar medium?
A) O and B stars B) open clusters C) K and M stars D) gas and dust E) all of the above
The relation between the Doppler shift of galaxies and their distances is called
A) the cosmological principle. B) Hubble's law. C) special relativity. D) Olbers's paradox. E) general gelativity.
In an adiabatic free expansion
a. no heat is transferred between a system and its surroundings. b. the pressure remains constant. c. the temperature remains constant. d. the volume remains constant. e. the process is reversible.