If the red shifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same red shifts, the quasar must be
a. very small.
b. within the Local Group.
c. a single star with an extremely large mass.
d. be moving toward Earth with a large radial velocity.
e. emit a very large amount of energy per second.
E
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Magnetic Field of a Long Wire: A long wire carrying a 2.0-A current is placed along the y-axis. What is the magnitude of the magnetic field at a point that is 0.60 m from the origin along the x-axis? (?0 = 4? × 10-7 T ? m/A)
A. 0.67 µT B. 1.3 µT C. 0.12 µT D. 6.7 T E. 12 T
The relativistic effect of time dilation has been verified by which of the following?
a. the discovery of black holes b. muon experiments c. twin experiments d. red shift in distant galaxies
Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?
A) The resistance of wire #1 is twice as high as that of wire #2. B) The resistance of wire #1 is equal to that of wire #2. C) The resistance of wire #1 is half that of wire #2. D) The resistance of wire #1 is four times higher than that of wire #2.
Which of the following colors is scattered most readily by small particles in the air?
a. green c. yellow b. blue d. red