Based on available data, what kind of objects in our solar system do most of the known extrasolar planets resemble?
A) jovian planets
B) terrestrial planets
C) Kuiper belt objects
D) None of the above: most extrasolar planets apparently belong to some new category of object.
A
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The sun is a star in the Milky Way Galaxy
Indicate whether the statement is true or false
Intensity: The intensity of the waves from a point source at a distance d from the source is I. At what distance from the sources is the intensity equal to 2I?
A. d/2
B. d/
C. d/4
D. d/8
The amount of force needed to sustain motion of a rock in outer space is
A) a force equal to its weight. B) a force less than its weight if friction is absent. C) none of these
A lightbulb is plugged into a household outlet, and one of the wires leading to it is wound into a coil. Now a slug of iron is slid into the coil. What effect will this have?
A) The lamp will dim because energy will now be dissipated in the iron. B) The lamp will get brighter because there will be an induced emf that will drive more current through the lamp. C) The lamp will dim because a back emf will be produced by the coil, and this will reduce the current flowing in the coil and the lamp. D) This will have no effect on the brightness of the lamp. E) This will not affect the lamp's brightness because the coil will shift the phase, but not the magnitude, of the current through the lamp.