To drop a package to Earth's surface from a satellite in close-Earth orbit, project it
A. ahead at satellite speed.
B. straight downward.
C. behind at satellite speed.
D. none of the above
Answer: C
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The least amount of magnetic force on a moving electron occurs for motion
A. at non-right angles to the magnetic field direction. B. parallel to the magnetic field. C. perpendicular to the magnetic field. D. none of the above
The geologic evidence that much of North America and Europe was covered with glaciers until about 10,000 years ago provided evidence that
A. the kinds of plants and animals present at the time were adapted to cooler temperatures. B. sea level fell because water was tied up in glaciers. C. there has been great change in climate during the time humans have been present. D. All of these statements are correct. E. None of these statements is correct.
Which of the following is a hazardous waste?
A) heavy metals B) PCB oils C) cyanides D) strong solvents E) All of these are hazardous wastes.
In the Southern Hemisphere about ________ percent of the surface is land
A) 19 B) 25 C) 34 D) 55 E) 78