The youngest features visible with telescopes on the Moon are:
A) the volcanoes seen erupting in the highlands.
B) the craters sitting atop the mare.
C) the darkest regions of the mare.
D) the bright polar caps of new ice.
E) the scarps recently created by tectonic activity.
B
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The speed of light is 3.0 × 10^5 km/s, and it takes 1.3 s for light to travel from the Moon to Earth. From this information, what is the distance to the Moon?
a. 390,000 km b. 230,000 km c. 3.9 km d. 2.3 km e. 4.3 × 10^5 km
The mass of air inside an average mid-size automobile is about
A) 0.2 kg. B) 2 kg. C) 20 kg. D) 200 kg. E) 2000 kg.
Suppose the gravitational potential energy for a mass at an altitude of one Earth radius is PE1 and at two Earth radii is PE2 . How do the absolute values of these potential energies compare?
a. |PE1| = 2|PE2| b. |PE1| = 4|PE2| c. |PE1| < 2|PE2| d. |PE1| > 2|PE2| but is not equal to 4|PE2|
As rising air cools, its ability to accommodate water vapor decreases so the
A) relative humidity of the rising air decreases. B) adiabatic rate stabilizes. C) air becomes more wet. D) relative humidity of the rising air increases.