Erosion performed by flowing water alone is known as
A. weathering.
B. abrasion.
C. hydraulic action.
Answer: C. hydraulic action.
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Energy in Capacitors: Measurements show that it takes 0.30 mJ of work to move 5.0-?C of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kept constant. What is the potential difference between the plates of this capacitor?
A. 60 V B. 81 V C. 55 V D. 23 V E. 0 V
While a rock is falling straight down with negligible air resistance, it has
A) an unchanging speed. B) an increasing speed. C) a decreasing speed. D) zero speed. E) None of the above.
One of the main problems with the Bohr model of the hydrogen atom when compared with the results of the methods of quantum mechanics used to describe atoms, was that the Bohr model predicted
a. the ground state angular momentum was L = 1 . b. the frequency of the radiation emitted when an electron "jumps" from one allowed orbit to another was hf = Ei ? Ef. c. the potential energy function for the hydrogen atom was given by V(r) = ?ke2/r. d. the energy of the ground state of the hydrogen atom was En = ?13.6 eV.
What is the primary reason we divide the ingredients of the solar nebula into four categories (hydrogen/helium gas; hydrogen compound; rock; metal)?
a. The amount of energy required to ionize these materials varies considerably. b. The temperature at which these materials condense into a solid varies considerably. c. The atomic mass number of these materials differs considerably. d. The abundance of these materials depended on their location in the solar nebula.