How fast is the star moving with respect to earth
Light of wavelength 659.9 nm is emitted by a star. The wavelength of this light as measured on Earth is 660.9 nm. How fast is the star moving with respect to Earth?
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A solid non-conducting sphere of radius 0.01m has a total charge 5C and a uniform charge distribution. Using Gauss's Law, determine the electric field (as a vector) in the regions r < 0.01m and r > 0.01m
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