posted by margaret .
Certain neutron stars (extremely dense stars) are believed to be rotating at about 100 rev/s. If such a star has a radius of 10 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?
Assuming gravity is the force holding it together,
F=GMassStar*mass2/radius^2 where mass2 is the chunk wanting to fall off.
F= mass2 v^2/r
set them equal, find massStar.