A gas is confined to a rigid container that cannot expand as heat energy is added to it. This process is
A) isothermal.
B) isometric.
C) isobaric.
D) isentropic.
E) adiabatic.
B
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As the sloped surface supporting a shoe becomes steeper
A) the shoe's weight mg remains unchanged. B) the normal force becomes less. C) friction needed to keep it at rest increases. D) all of the above E) none of the above
Amino acids found in protein in life on Earth are
A) a unequal mixture of left-handed and right-handed molecules, left-handed being most abundant B) all left-handed molecules C) all right-handed molecules D) an equal mixture of left-handed and right-handed molecules
In the Milky Way galaxy, gas and dust are found
A) in molecular clouds. B) everywhere. C) in neutral hydrogen clouds. D) in dark nebulae. E) in emission nebulae.
Which of the following gases, which we might be able to detect in infrared spectra, would be a strong indicator of life on another planet?
A) carbon dioxide B) ozone C) methane D) water vapor E) sulfuric acid