The size of a neutron star that has the mass of the Sun.

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Chapter 17, Problem 45QP

To determine

The size of a neutron star that has the mass of the Sun.

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What is the average density of a neutron star that has the same mass as the sun but a radius of only 86.31 km? Express your answer in the proper SI unit and without scientific notation.

2. 60 million years ago, an asteroid hit the Earth and killed every T-Rex on Earth. That same day, a star was born. 45 years ago, the singer of the band T Rex, Marc Bolan, wrapped himself around a tree at high speed. That same day, the star born 60 million years ago left the main sequence. Estimate the mass of that star, stating all assumptions you make.

Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. The density of a neutron star is roughly 10¹4 times as great as that of ordinary solid matter. Suppose we represent the star as a uniform, solid, rigid sphere, both before and after the collapse. The star's initial radius was 7.0×105 km (comparable to our sun); its final radius is 18 km.