What is the Oort cloud?
A) It is the spherical distribution of the trillion or so comets thought to orbit the Sun at great distances.
B) It is another name for the cloud of gas from which our solar system was born.
C) It is a great cloud of gas that resides far beyond the orbit of Pluto.
D) It is a giant storm in the atmosphere of Saturn.
A
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Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z has a positive charge. e. Z is neutral (has no net charge).
You could use two parallel wires to move objects 1 and 2 apart if each wire is embedded in its own object and if 
A. one wire carries a current and the other wire has zero current. B. the currents in the wires are in the same direction. C. the currents in the wires are in opposite directions.
A jet flies at 1.4 times the speed of sound. What is the half-angle of the conical shock wave formed?
A) 46° B) 44° C) 30° D) 36°
The filament temperature of a light bulb is 2 100 K when the bulb delivers 40.0 W of power. If its emissivity remains constant, what power is delivered when the filament temperature is 2 500 K?
a. 161 W b. 121 W c. 80.3 W d. 60.3 W e. 40.2 W