Two particles A and B have identical charge Q. For a net force of zero to be exerted on a third charged particle it must be placed:
A) midway between A and B
B) on the perpendicular bisector of the line joining A and B but away from the line
C) on the line joining A and B, not between the particles
D) on the line joining A and B, closer to one of them than the other
E) at none of these places (there is no place)
A) midway between A and B
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Jupiter's center appears to have a rocky core. In this context, the term rocky core refers to:
A) the number of light-weight elements in Jupiter. B) Jupiter's temperature. C) Jupiter's chemical composition. D) the properties of the material present in Jupiter.
Differential rotation of the sun is
a. heating in the chromosphere and corona that makes them hotter than the photosphere. b. the magnetic dynamo inside the sun. c. the equatorial regions of the sun rotating more rapidly than the polar regions. d. the origin (and subsequent disappearance of) sunspots first near the poles then closer to the sun's equator as the sunspot cycle progresses. e. the rotation of the sun's southern and northern hemispheres in opposite directions.
The property of objects to resist a change in motion is called
1) friction, 2) velocity, 3) inertia, 4) acceleration, 5) gravity, and it is measured by its 6) speed. 7) velocity. 8) mass. 9) all of these.
What causes the apparent retrograde motion of the planets?
A) It is an illusion created as we pass by a planet in our orbit (or the planet passes by us). B) It occurs when the planets reverse the direction of their orbits around the Sun. C) It is caused by the motion of planets around small circles that in turn go around bigger circles. D) It is an illusion created by our lack of depth perception in space. E) It is something we see only for planets that orbit the Sun in the opposite direction of Earth.