The Earth's density increases with depth. If instead the Earth had uniform density, but the same angular velocity and mass, how would its rotational kinetic energy compare to the actual value?
a. It would be the same as the actual value.
b. It would be less than the actual value.
c. It would be greater than the actual value.
d. More information is needed to find the answer.
c
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What is a meteor?
A. the object that causes a "shooting star," but before it passes through the atmosphere B. any one of the large rocky bodies that orbit the Sun, primarily between Jupiter and Saturn C. a space rock that survives its fall through Earth's atmosphere and reaches the ground D. a glowing trail of hot gas and debris heated by friction as an object moves through the atmosphere
At t = 0 the switch S is closed with the capacitor uncharged. If C = 50 ?F, ? = 20 V, and R = 4.0 k?, what is the charge on the capacitor when I = 2.0 mA?
a.
360 ?C
b.
480 ?C
c.
240 ?C
d.
600 ?C
e.
400 ?C
Semiconductors: In a good insulator, the highest energy band containing electrons, called the valence band, is
A. only partially filled. B. completely filled. C. completely empty.
What is the composition of the clouds of Venus?
A) Water, like Earth's clouds B) Frozen carbon dioxide, as on Mars C) A combination of ammonia and methane, like Uranus D) Sulfur and sulfuric acid droplets E) Hydrogen sulfide and ammonia