Mercury's smooth plains are most similar to the Moon's:

A) maria.
B) highlands.
C) craters.
D) mountain ranges.


A

Physics & Space Science

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A normal heat engine is used to drive an electric generator. Part of the power from this generator runs a refrigerator that absorbs the waste heat from the engine and pumps it back into the hot reservoir.

A. first kind B. second kind

Physics & Space Science

Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)

A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of star 1 is a factor of 100 less than the luminosity of star 2. C) Star 1 is 100 times more distant than star 2. D) Star 1 is 100 times nearer than star 2. E) Star 1 is 10 times more distant than star 2.

Physics & Space Science

Thin Lenses: If a object is placed between a convex lens and its focal point, the image formed is

A. virtual and upright. B. virtual and inverted. C. real and upright. D. real and inverted.

Physics & Space Science

What is the electron configuration for Li which has three electrons?

A) 1s3 B) 1s12s2 C) 1s22s1 D) 1s21p1 E) 1s11p2

Physics & Space Science