A typical galaxy is a
A) collection of a few hundred million to a trillion or more stars, bound together by gravity.
B) large, glowing ball of gas powered by nuclear energy.
C) nearby object orbiting a planet.
D) relatively small, icy object orbiting a star.
A
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Why do our best radar maps of Venus come from the Magellan space probe?
What will be an ideal response?
The Sun
A) rotates in the same direction as the planets revolve. B) rotates in the opposite direction as the planets revolve. C) does not rotate relative to the planets. D) takes longer to rotate than for the planets to revolve.
A -4.0-?C charge is situated at the origin of an xy-coordinate system. Another -4.0 ?C charge is at y = 4.0 m. What is the electric potential at a point x = 3.0 m due to these two charges?
A) -3600 V B) 3600 V C) -4800 V D) 4800 V E) 0 V
If the radius of the Earth somehow decreased with no change in mass, your weight would
A) decrease. B) increase. C) not change.