The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that
a. they are formed by material falling into the galaxy.
b. they are powered by magnetic fields.
c. they are excited by radiation from nearby galaxies.
d. they are powered by the rapid rotation of the galaxy.
e. they are created by jets from the galaxy emitting where the material is halted.
E
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How much energy is stored in the 50-?F capacitor when Va ? Vb = 22 V?
?
?
a.
0.78 mJ
b.
0.58 mJ
c.
0.68 mJ
d.
0.48 mJ
e.
0.22 mJ
The hydrogen lines in spectral type A stars
a. are most narrow for supergiants. b. are most narrow for main sequence stars. c. can not be used to estimate the luminosity of the star. d. are very weak and difficult to see. e. are useful in determining the apparent magnitude of the star.
What was Einstein's main reason for proposing the principle of the constancy of lightspeed?
A) This principle followed from his conclusions regarding the relativity of time and space. B) His own observations of such simple phenomena as reflection and refraction convinced him that light must have the same speed for all observers. C) The Michelson-Morley experiment showed that every observer observes the same speed for any lightbeam. D) He believed that Maxwell's theory of electromagnetism should obey the principle of relativity. E) He believed that conservation of energy should be obeyed in every nonaccelerated reference frame.
A metal blade spins at a constant rate of 5.0 revolutions per second about a pivot through one end of the blade. This rotation occurs in a region where the component of the earth's magnetic field perpendicular to the blade is 30 ?T. If the blade is 60 cm in length, what is the magnitude of the potential difference between its ends?
a. 0.24 mV b. 0.20 mV c. 0.17 mV d. 0.27 mV e. 0.34 mV