A cube has a density of 2000 kg/m3 while at rest in the
Chapter 36, Problem 36.59(choose chapter or problem)
A cube has a density of 2000 kg/m3 while at rest in the laboratory. What is the cubes density as measured by an experimenter in the laboratory as the cube moves through the laboratory at 90% of the speed of light in a direction perpendicular to one of its faces?
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