Which of the following people did NOT accept a heliocentric model for the universe?
a. Kepler
b. Copernicus
c. Tycho
d. Galileo
e. Newton
c
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The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes a 20° angle with the ground. The normal force of the level ground on the first box is 
; the normal force of the ramp on the second box is 
. Which statement is correct?
A.
= = mg.B.
= mg; = mg sin 20°.C.
= mg; = mg cos 20°.D.
= mg; = ?mg cos 20°.E.
= ? = ?mg.An ideal gas is allowed to expand adiabatically. Assume the process is reversible. What is the change in entropy?
a. 0 b. nR ln (V2/V1) c. nR ln (T2/T1) d. kn ln (V2/V1) e. kn ln (T2/T1)
In bombarding atomic nuclei with proton "bullets," the protons must be accelerated to high energies to make contact with the target nuclei
A) because the target nuclei are so small. B) because the target nuclei are negatively charged. C) in order to penetrate through the electrons that surround each target nucleus. D) because the target nuclei are positively charged.
If a comet's ion tail is pointing perpendicular to its direction of travel, the comet is
A) close to or at aphelion. B) moving away from the Sun. C) close to or at perihelion. D) moving closer to the Sun. E) A comet's tail never points perpendicular to its motion.