Dark matter suspected to exist in the universe because:
A) the night sky is dark between stars
B) the orbital period of stars in the outer parts of a galaxy is greater than the orbital period of stars near the galactic center
C) the orbital period of stars in the outer parts of a galaxy is less than the orbital period of stars near the galactic center
D) the orbital period of stars in the outer parts of a galaxy is about the same as the orbital period of stars near the galactic center
E) all galaxies have about the same mass
Correct Answer:
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Q32: Any meson is a combination of:
A)three quarks
B)two
Q38: Any baryon is a combination of:
A) three
Q39: All known quarks have:
A) charges that are
Q40: The color theory explains why quarks:
A)form particles
Q44: A down quark can be changed into
Q46: The quark content of a proton is:
A)uuu
B)uud
C)udd
D)ddd
E)uds
Q46: Messenger particles of the strong interaction are
Q53: If dark matter did not exist it
Q56: The velocities of distant objects in the
Q57: Hubble's law is evidence that:
A)the speed of
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