Question: A cube has a density of 2000 kg/m 3 while at rest in the laboratory. What is the cubes density as measured by an experimenter

A cube has a density of 2000 kg/m³ while at rest in the laboratory. What is the cube’s 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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