After rolling halfway down an incline, a marble's kinetic energy is
A) less than its potential energy.
B) greater than its potential energy.
C) the same as its potential energy.
Answer: C
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A diffraction grating has 300 lines per mm. If light of frequency 4.76 × 1014 Hz is sent through this grating, at what angle does the first order maximum occur? (c = 3.00 × 108 m/s)
A) 56° B) 44° C) 22° D) 11° E) 28°
The Oort Cloud is believed to be
A) a grouping of asteroids and meteoroids between the orbits of Mars and Jupiter. B) the great nebula found just below the belt stars of Orion. C) a spherical cloud of cometary nuclei far beyond the Kuiper Belt. D) a flattened belt of cometary nuclei just beyond the orbit of Neptune. E) the circular disk of gas around the Sun's equator from which the planets formed.
A dielectric material such as paper is placed between the plates of a capacitor holding a fixed charge. What happens to the electric field between the plates?
A) no change B) becomes stronger C) becomes weaker D) reduces to zero E) cannot be determined without additional information
The summer solstice (at the start of summer) is the point on the ecliptic where the Sun
a. crosses the celestial equator moving north. b. crosses the celestial equator moving south. c. is farthest north of the celestial equator halting its northward movement. d. is farthest south of the celestial equator halting its southward movement.