Does an electric field exert a force on a straight current-carrying wire? Assume the current is along the x axis and field is in the y direction
1.yes
2.no
2
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Why can't current theories describe what happened during the Planck era?
A) We do not yet have a theory that links quantum Wmechanics and general relativity. B) We do not understand the properties of antimatter. C) We do not know how much energy existed during that time. D) It was a time period from which we cannot receive radiation. E) The Planck era was the time before the Big Bang, and we cannot describe what happened before that instant.
A steel wire in a piano has a length of 0.700 m and a mass of 4.30 grams. To what tension must this wire be stretched to make the fundamental frequency correspond to middle C, (fc = 261.6 Hz)?
A commercial jet flies above a region of the earth where the earth’s magnetic field points nearly (a) straight upward, which part of the airplane becomes negatively charged?
A. Its nose B. Its tail C. Its top D. Its bottom E. Its left wing F. Its right wing T. (No part becomes charged.)
Which of the following objects would produce an emission line spectrum?
A) a hot, low-density neon gas B) a star like our Sun C) a light bulb D) the Earth