Created by StemPy LabThe radius of a nucleus is given by , where is its mass number. A certain nucleus has twice the radius of a beryllium-8 nucleus. Its mass number is ____.
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← A uniform disc of mass 2 kg rolls without slipping along a horizontal floor, with its centre moving at 4 m/s. Its total kinetic energy, in joules, is ____.A bird flies 6 m above the surface of a still lake. A fish looks straight up at it from just below the surface. The refractive index of water is 4/3. To the fish, the bird appears to be how many metres above the surface? ____ →
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