The Sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice.
b. autumnal equinox and the vernal equinox.
c. summer solstice and the winter solstice.
d. autumnal equinox and the winter solstice.
e. Sun is on the ecliptic and is never on the celestial equator.
b
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The _____ is the high-density, high-temperature state from which the expanding Universe of galaxies began
A) big bang B) big dipper C) big collision D) big rip
When introduced into a region where an electric field is present, a proton with initial velocity 
will eventually move
A. along an electric field line, in the positive direction of the line. B. along an electric field line, in the negative direction of the line. C. to a point of decreased potential. D. to a point of decreased potential. E. as described in both (a) and (c).
A 200-g hockey puck is launched at an initial speed of 16 m/s up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are µs = 0.40 and µk = 0.30, respectively
What vertical height does the puck reach above its starting point? A) 17 cm B) 13 cm C) 4.2 cm D) 8.6 cm
An originally neutral electroscope is briefly touched with a positively charged glass rod. The electroscope
A) remains neutral. B) becomes negatively charged. C) becomes positively charged. D) could become either positively or negatively charged, depending on the time of contact.