The energy of a system
a. always increases.
b. always remains constant.
c. increases when work is done by the system.
d. increases when work is done on the system.
d
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The greatest gravitational lensing is produced by the ________ that lie in the centers of massive galaxies
Fill in the blank(s) with correct word
A cold trap is set up to cause molecules to linger near the suction in a vacuum system. If the cold trap has an effective volume of 0.200 L and is maintained at 13.0 K,
how many molecules are in it at 10.0 Pa of pressure? (Avogadro's number is 6.022 × 1023 molecules/mol, and the universal gas constant is 8.314 J/mol•K. Assume the behavior of an ideal gas.) A) 1.11 × 1019 molecules B) 1.10 × 1022 molecules C) 7.71 × 1020 molecules D) 7.71 × 1023 molecules
When the term singularity is mentioned, the object under discussion is probably a
a. white dwarf. b. black hole. c. neutron star. d. nova.
According to cosmic inflation theory, the distribution of galaxies we see today is a consequence of
A) the evolution of dark matter. B) quantum fluctuations in the exceedingly small early universe. C) random expansion. D) some force yet to be identified.