What Force Keeps a Spinning Rock from Falling?

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pedro trindade
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hey, hello... I'm a brazillian, currently studying electronic engineering (sorry for my english), and yeah, i thought it would be great to catch some of the information of you people from around the world and eliminate those silly questions and problems that not always you can eliminate on class. like, what force anulates the gravity preventing a rock tied on a rope spinning over my head to fall and just stay fixed in his horizontal axis, the centrifugal force and the centripetal are both horizontal in this case... what happens?
 
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Welcome pedro! Feel free to ask your question in the appropriate forum.
 
i'm a little lost ^^ which forum exactly i can ask this question?
 

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