A neutron star is formed when a star has burned all its nuclear fuel and begins to collapse in upon itself. It then packs roughly the mass of our Sun into a region with the same radius as that of a small city while continuing to spin at very rapid rate. Lets say you have a neutron star with a radius of 13 km and rotational velocity of 103 rotations per minute.(adsbygoogle = window.adsbygoogle || []).push({});

---------------------------------------------------------------------a) What is must be the minimum mass so that the material on its surface remains in place?

First thing I did was convert rotational velocity to translational velocity.

so (103 rev/min)(2pi/1rev)(1min/60secs)*13000m= A (lets just keep it simple for now)

Well, I want the minimum mass, so I looked into the gravitatin chapter, and the only thing that pops out at me is the escape speed formula

v=sqrt(2*G*M/R)

where G is the gravitation constant

M is my variable

and R is my radius.

So I plugged in my velocity, and solved for M, but its not working out right. Am I missing something here, or am I on the right track? *sigh* Too much time wasted on this problem..lol

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Gravitation, neutron starlooks simple

**Physics Forums | Science Articles, Homework Help, Discussion**