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---------------------------------------------------------------------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