Chapter 4, Problem 120E

Neutron stars are believed to be composed of solid nuclear matter, primarily neutrons.

a. If the radius of a neutron is $1.0\times {10}^{-13}$ calculate its density in g/ cm³

$\left(\text{volume of a sphere}=\frac{4}{3}\pi r^3\right)$

b. Assuming that a neutron star has the same density as a neutron, calculate the mass in kilograms of a small piece of a neutron star the size of a spherical pebble with a radius of 0. 10 mm.