How does a permanent magnet work, i.e., what is the explanation of its magnetic effects?
A) Electric charge is permanently separated within the magnet, with positive static charge at one end and negative static charge at the other end of the magnet.
B) Electrons orbiting individual atoms in the magnet are all aligned together so that their orbital motion produces a large overall effect.
C) The material of the magnet is highly ionized, with one type of ion residing on one end of the magnet and the other type of ion residing on the other end.
D) Subatomic particles known as "magnetic poles" are placed on each end of the magnet, with one type of pole placed on one end and the other type on the other end.
E) Magnets are a communist plot.
B
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If all the "dark matter" in our universe were to be instantaneously removed, which of the following would not happen?
A) The Milky Way would fly apart. B) Clusters of galaxies would fly apart. C) The universe would expand forever. D) The Solar System would fly apart. E) All of the above
Which of the following is a feature of quantum physics but not a feature of Newtonian physics?
A) Determinism: The future is entirely determined by the present. B) Force at a distance: Objects can exert forces on other objects that are some distance away, across empty space. C) The observation process must be included as part of the theory. D) The principle of conservation of energy. E) All of the above.
What are stars made of?
A: Gases, primarily Hydrogen, then Helium B: Nothing but light and energy C: Trick question- we really don't know D: Pretty much the same as Earth, but with a special shell E: They're fireflies stuck in the big blue/black thing
What is the equivalent capacitance of the combination shown?
a.
20 ?F
b.
90 ?F
c.
22 ?F
d.
4.6 ?F
e.
67 ?F