Question: 1. What does the term period mean in circular motion? 2. For a person swinging a ball on a string, is there any speed at

1.  What does the term "period" mean in circular motion?
2.  For a person swinging a ball on a string, is there any speed at which the string would be horizontal? If so, what is that speed?
3. How does centripetal force vary with mass? How does centripetal force vary with radius of revolution? 
4. How does centripetal force vary with period of revolutions? 

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