The major credit for the development of the periodic table goes to
a. Berzelius.
b. Lavoisier.
c. Boyle.
d. Mendeleev.
d
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In the context of a big bang model, identify a true statement about the flatness problem
A) It is the peculiar circumstance that the early Universe's average density was much more than the critical density but it was still flat. B) It is the peculiar circumstance that the actual density of the Universe will always be equal to the critical density and will always remain flat. C) It is the peculiar circumstance that the early Universe must have contained exactly the right amount of matter to make space-time flat. D) It is the peculiar circumstance that the early Universe's average density was considerably less than the critical density but it was still flat.
Induction: A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod
A. is repelled by the sphere. B. is attracted to the sphere. C. feels no force due to the sphere.
The lensing of a distant quasar is produced by ________ of a foreground galaxy
A) all the normal matter and dark matter B) only the mass of the black hole in the nucleus C) an individual star D) a pulsar's intense magnetic field E) a relativistic jet
Which of the following statements is true for a series RLC ac circuit in resonance? (There could be more than one correct choice)
A) The inductive reactance and the capacitive reactance are both equal to zero. B) The inductive reactance is equal to the capacitive reactance. C) The current in the circuit is a minimum. D) The current in the circuit is a maximum. E) The rms current is equal to the peak current.