A skydiver who weighs 500 N reaches terminal velocity of 90 km/h. The air resistance on the skydiver is then
A) 90 N.
B) 250 N.
C) 410 N.
D) 500 N.
E) none of the above
D
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Which of the following is true regarding Earth's axis?
A) The axis remains parallel to the plane of the ecliptic. B) The amount of axial tilt fluctuates during the year and forms the basis for seasonal changes. C) All locations on earth receive sunlight at a 90° angle at least once a year due to the tilt. D) The axis is tilted 23.5° from a perpendicular to the plane of the ecliptic. E) Axial tilt is unrelated to the phenomenon of seasonal change.
According to the International Whaling Commision (IWC), which is NOT a way to legally hunt whales?
a) aboriginal subsistence whaling b) scientific whaling c) whaling by objection d) whaling to thin out the various whale species e) all of the above
________ dunes in the Sahara are as high as 200 m and as long as 120 km.
A. Parabolic B. Ventifact C. Barchans D. Transverse E. Longitudinal
Which of the following is most closely associated with a mantle plume?
A) The lower Mississippi River Valley B) The Hawaiian Islands C) The Florida peninsula D) Southern California E) Western Europe