Which contracts more when the temperature is slightly increased? Equal volumes of
A) iron.
B) wood.
C) ice water.
D) helium.
E) none of the above contract when heated
Answer: C
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Aluminum alloys are readily deformed into shape because they have the _________-centered-cubic crystal structure.
Fill in the blank(s) with the appropriate word(s).
The banking angle for a properly banked curve does not depend on the mass of the car going over it
Indicate whether the statement is true or false
A basketball player jumps to make a basket and remains in the air for a moment. A sportscaster then remarks that she has "defied gravity." Which of the following accurately describes the situation?
A) The player did stay in the air in spite of the Law of Gravitation, but a single counter-observation is not enough to warrant revisiting a theory that usually works. B) The player produced enough force with her legs to accelerate upward and remains above ground only until the acceleration of gravity brought her back down. C) The player can "defy gravity" because the Universal Law of Gravitation makes an exception for basketball players. D) The player has defied gravity, so scientists must go back into the lab to refine their theory.
In order for the atoms in a neon discharge tube (or a neon beer sign) to emit their characteristic orange light, it is necessary that
A) there be no unoccupied energy levels in each atom. B) each atom carry a net electric charge. C) the atoms be continually replaced with fresh atoms, because the energy of the atoms tends to be used up with continued excitation, resulting in dimmer and dimmer light. D) electrons first be given energy to raise them from their ground state to an excited state.