Hubble's law is evidence that:
A) the speed of light is increasing
B) the universe is expanding
C) the Earth is slowing down in its orbit
D) galaxies have rotational motion
E) none of the above
Correct Answer:
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Q15: The quark content of a
Q16: The two basic interactions that have finite
Q17: Messenger particles of the electromagnetic interaction are
Q18: Messenger particles of the strong interaction are
Q19: Messenger particles of the weak interaction are
Q20: A down quark can be changed into
Q21: The color theory explains why quarks:
A) form
Q22: Color is carried by:
A) only quarks
B) only
Q24: As a result of the big bang
Q25: The velocities of distant objects in the
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