The extrasolar planets are found mainly by observing the ________ shifts of their stars
Fill in the blank(s) with correct word
Doppler
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An AC generator rotating at 60. Hertz in a 300. Gauss field has 1000. turns and produces an rms voltage of 150. volts and an rms current of 70. Amperes
(a) What is the peak current? (b) What is the area of each turn in the coil?
A guitar string is fixed at both ends. If you tighten it to increase its tension
A) the frequencies of its vibrational modes will increase but its wavelengths will not be affected. B) the wavelength increases but the frequency is not affected. C) both the frequency and the wavelength increase.
Just after an alpha particle leaves the nucleus, would you expect it to spJust after an alpha particle leaves the nucleus, would you expect it to speed up? Why?eed up? Why?
A) No. Once the alpha particle leaves the nucleus it is slowed by the repulsion of the next closest atom's nucleus. B) No. As the alpha particle leaves the nucleus it is slowed by the constant attraction of the electrons surrounding the nucleus. C) Yes. Once the alpha particle leaves the nucleus there are no more forces acting on it and it therefore accelerates. D) Yes. Once the alpha particle leaves the nucleus it accelerates because of mutual electric repulsion with the nucleus from which it escaped.
Which of the following statements best describes what is "relative" in the theory of relativity?
A) The theory says that everything is relative. B) The theory says that truth can never be established in any absolute sense. C) The theory says that measurements of motion make sense only when we state what they are measured relative to. D) The theory says that the speed of light is relative and depends on who is measuring it. E) The theory says that all scientific results must be considered within the context of the scientists' individual viewpoints.