A commercial jet flies above a region of the earth where the earth’s magnetic field points nearly (a) straight upward, which part of the airplane becomes negatively charged?
A. Its nose
B. Its tail
C. Its top
D. Its bottom
E. Its left wing
F. Its right wing
T. (No part becomes charged.)
E. Its left wing
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List the four laws of stellar structure
What will be an ideal response?
Which of the following makes it very difficult to detect planets around other stars?
A) Planets are constantly orbiting their stars, so we don't know where to point our telescopes to see them. B) Planets are typically at least a billion times fainter than their host stars. C) Planets give off only infrared light, not visible light. D) Planets orbit too far from their stars to be detected.
The rings of Uranus were discovered by the Voyager 2 spacecraft
a. True b. False Indicate whether the statement is true or false
An incompressible fluid flows irrotationally through a tube of circular crosssection that has greater diameter at one end than the other. What conclusion can you reach about the speed of the fluid at the ends of the tube?
A) The flow must be at a slower speed at the end with a greater diameter. B) The speed of the flow must be the same at both ends. C) Pressures and tube heights must be known to relate the flow speeds at the two ends. D) The flow must be at a faster speed at the end with a greater diameter. E) No conclusions can be reached based on this information.