Physics

Physics

Problem

A planet has mass 4.0×1024 kg4.0\times10^{24}\,\text{kg} and radius 6.0×106 m6.0\times10^{6}\,\text{m}. Find the gravitational potential difference V(3R)−V(2R)V(3R)-V(2R), where RR is the planet’s radius. a) −7.4×106 J kg−1-7.4\times10^{6}\,\text{J kg}^{-1} b) +2.2×107 J kg−1+2.2\times10^{7}\,\text{J kg}^{-1} c) +7.4×106 J kg−1+7.4\times10^{6}\,\text{J kg}^{-1} d) +4.4×107 J kg−1+4.4\times10^{7}\,\text{J kg}^{-1}

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