The orbits of most comets
A) have perihelions within the orbits of Mercury.
B) are like the planets, fairly circular and in the ecliptic plane.
C) lie almost entirely beyond the orbit of Neptune.
D) go no farther out than Pluto, then return to the sun again.
E) are shorter than the 76-year period for Comet Halley.
C
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What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
A) the strong force and the weak force B) gravitational force and outward pressure C) gravitational force and surface tension D) the strong force and the electromagnetic force
In order for life to survive in the atmospheres of Jupiter and Saturn it would have to
A) be high in the atmosphere where it could collect solar radiation B) be at the center, close to the rocky core where a rocky surface exists C) be large and buoyant, allowing it to maintain a stable altitude in the atmosphere D) float on the surface of the layer of liquid metallic hydrogen
Which is a useful property of a prism?
A) internally reflects 100% of incident light B) changes directions of light in a variety of ways C) re-inverts images D) all the above E) none of the above
The net electric charge on a current-carrying wire is normally
A) zero. B) equal and opposite to the charge within the wire. C) the voltage divided by the resistance.