All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) The axis tilt of Mars is thought to change significantly with time.
B) Mars lost any global magnetic field that it may once have had.
C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars.
D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
B
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A player hits a ball with a bat. If one part of the interaction is the bat against the ball, the other part is the
A) air resistance on the ball. B) weight of the ball. C) ball against the bat. D) grip of the player's hand against the ball. E) none of the above
The pressure in a constant-volume gas thermometer extrapolates to zero at what temperature?
a. 0°C b. 0 K c. 0°F d. 0 Pa
A thin spherical shell of radius 20.0 cm has 5.0 ?C of charge uniformly distributed over its surface. What is the magnitude of the electric field 2.00 m from the center of the sphere?
a. 
b. 
c. 
d. 
e. 0
A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify