1. The problem statement, all variables and given/known data Certain neutron stars (extremely dense stars) are believed to be rotating at about 1000 rev/s. If such a star has a radius of 7 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation? 2. Relevant equations 3. The attempt at a solution (7x10^3)(1000*2pi)/6.67*10^-11= 2.0301495 I'm getting it wrong. Any hints why?