The number of protons in the nucleus of an electrically neutral atom is equal to
A) the number of neutrons in the nucleus.
B) the number of neutrons surrounding the nucleus.
C) the number of electrons surrounding the nucleus.
D) the number of electrons in the nucleus.
E) None of the other choices is correct.
C
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Emperor penguins are part of the species forsteri and genus aptenodytes. Given this, their scientific classification would be written
A) Aptenodytes Forsteri B) forsteri Aptenodytes C) Forsteri aptenodytes D) Aptenodytes forsteri
What is the most significant drawback of possibly sending humans to Mars?
A) the fact that there would be no possible source of water on the surface B) the high probability of contamination of the Martian surface by microbes associated with human beings C) the high probability of Martian microbes contamination of contaminating the crew D) the fact that astronauts could not breathe in the Martian atmosphere
For a spherical planet to act like a "point mass", so that externally F=GmM/r2, it
A) must have constant density throughout. B) must have a mass << r c2 / (2G). C) must have spherical mass symmetry. D) can not be hollow inside.
The vast numbers of electrons in a coin don't fly off the surface because
A) mutual repulsion is incomplete. B) they are attracted by an equal number of protons. C) they are strongly bonded to their atoms. D) all of the above E) none of the above