If Mars' atmosphere is mostly carbon dioxide, why isn't it as hot as Venus?
What will be an ideal response?
Although it has a carbon dioxide atmosphere, Mars' atmosphere is very thin, much less dense than Venus' or even Earth's.
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Three point charges are positioned as follows: 
is at (0.00 m, 0.00 m), 
is at (1.20 m, 0.00 m), and
is at (1.20 m, 1.60 m). If 
in what direction (ccw from the x axis) is the force on
?
a. 
b. 
c. 
d. 
e. 
Relative Velocity: A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. How fast can she swim in still water?
A. 0.50 m/s B. 0.80 m/s C. 1.2 m/s D. 1.4 m/s E. 1.8 m/s
During the eighteenth and nineteenth centuries, attempts to precisely measure the astronomical unit relied largely on rare
A) total solar eclipses. B) transits of the inferior planets across the Sun. C) passages of comets close to the Earth. D) maximum elongations of Venus. E) oppositions of Mars.
Which kind of telescope is shown and where is it located?
a. optical, ground b. radio, space c. radio, ground d. optical, space