The exchange particles for the strong force are
A) neutrinos.
B) photons.
C) quarks.
D) gluons.
E) W+, W-, and Z.
D
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Side branches on a polymer _________the density, crystallinity, yield strength, and elastic modulus.
Fill in the blank(s) with the appropriate word(s).
An electric car runs off a battery which drives the front wheels. The car’s rear wheels drive a generator which recharges the battery.
A. first kind B. second kind
What do we mean by the diffraction limit of a telescope?
A) It is the maximum size to which any telescope can be built. B) It describes the farthest distance to which the telescope can see. C) It describes the maximum exposure time for images captured with the telescope. D) It is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion.
What percentage of a molecular cloud's mass is interstellar dust?
A) 1% B) 2% C) 28% D) 50% E) 1-50%, depending on the mass of the molecular cloud