Which of the following is not a characteristic of the seasons on Mars?
A) Global winds tend to blow from the summer pole toward the winter pole, sometimes initiating global sand storms.
B) The polar caps shrink in summer and grow in winter.
C) As on Earth, the seasons are caused primarily by axis tilt and orbital distance has virtually no effect.
D) The seasons last almost twice as long on Mars as on Earth.
C
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A waxing crescent Moon is visible
a. near the eastern horizon just before sunrise. b. near the eastern horizon just after sunset. c. near the western horizon just before sunrise. d. near the western horizon just after sunset. e. from sunset until sunrise.
Graphical Analysis: The graph in the figure shows the position of a particle as it travels along the x-axis. 
At what value of t is the speed of the particle equal to 0 m/s?
A. 0 s B. 1 s C. 2 s D. 3 s E. 4 s
A wiggle in both space and time is a
A) vibration. B) wave. C) both of these D) neither of these
A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?
a. 29 s b. 23 s c. 25 s d. 27 s e. 17 s