# physics

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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?

• physics -

Assuming gravity is the force holding it together,

F=GMassStar*mass2/radius^2 where mass2 is the chunk wanting to fall off.
But
F= mass2 v^2/r

set them equal, find massStar.

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