A devious classmate swings a sharp pencil at the end of some thread capable of withstanding only 10 N of force. Swinging a 20 g pencil in a horizontal, 50 cm radius circle, at what speed will the thread break and possibly strike down an innocent classmate in the prime of life? Also show the force diagram.

Physics for Scientists and Engineers, Technology Update (No access codes included)
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ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter5: The Laws Of Motion
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A devious classmate swings a sharp pencil at the end of some thread capable of withstanding only 10 N of force. Swinging a 20 g pencil in a horizontal, 50 cm radius circle, at what speed will the thread break and possibly strike down an innocent classmate in the prime of life?

Also show the force diagram. 

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