College Physics 10th Edition by Raymond Serway,Chris Vuille

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At the end of its life, a star with a mass of two times the Sun's mass is expected to collapse, combining its protons and electrons to form a neutron star. Such a star could be thought of as a gigantic atomic nucleus.If a star of mass 2 × 1.99 × 10 30 kg collapsed into neutrons ( mn = 1.67 × 10 27 kg), what would its radius be Assume r = r 0 A 1/3.