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I was not given an equation, it was one of them 'try to figure it out yourself equations' but I think it is:

r=9.81g?(pie * rpm/30)^2

at least that is the equation I got from wiki...

My attempt at a solution:

r=9.81(10 m/s^2)/ (pie *1rpm/30)^2

r =981/.0109

r =90,000

then I doubled the ratius to get the diameter:

d=180,000

that seems pretty large. i don't know what im doing wrong. if you could help that would be great. thanks.