An Introduction to Modern Astrophysics · Problem 17.18

Close Binary Star Systems — Carroll & Ostlie

Physics — Astrophysics · black-holes-angular-momentum

Problem

Use Eq. (17.29) to compare the maximum angular momentum of a

1.4\,M_\odot

black hole with the angular momentum of the fastest known pulsar, which rotates with a period of

0.00139

s. Assume that the pulsar is a

1.4\,M_\odot

uniform sphere of radius 10 km.