After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: Electrons moving upward feel a magnetic force in
the northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the east
B) toward the northeast
C) toward the southwest
D) toward the southeast
E) toward the west
C
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Which of the following best describes why scientists seek to identify even small asteroids that could potentially hit Earth?
A) to try to prevent an impact that might destroy a town or city B) to try to prevent an impact that might cause the extinction of the human race C) to help us understand the origin of the solar system D) to allow us to capture the asteroids and use them for their resources
Intermediate between E7 and Sa galaxies, ________ have a disk but no gas or dust
Fill in the blank(s) with correct word
Both transverse and longitudinal waves are produced when an earthquake occurs
Indicate whether the statement is true or false
According to Lenz's law, the direction of an induced current in a conductor will be that which tends to produce which of the following effects?
A) enhance the effect which produces it B) produce a greater heating effect C) produce the greatest voltage D) produce the smallest voltage E) oppose the effect which produces it