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uniform circular motion

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1. a stone of mass 0.2kg is whirled around on the end of a string of length 30cm. the string will break when the tension exceeds 8 kg.m.s-2 . calculate the maximum speed at which the stone can be whirled around before the string breaks?

i have this question and i have no idea how to get to the answer. its driving me round the bend. if someone can help me it would be great x
2. (Original post by mindy smith)
a stone of mass 0.2kg is whirled around on the end of a string of length 30cm. the string will break when the tension exceeds 8 kg.m.s-2 . calculate the maximum speed at which the stone can be whirled around before the string breaks?

i have this question and i have no idea how to get to the answer. its driving me round the bend. if someone can help me it would be great x
Note that T = mv^2 / r put T = 8 N, m = 0.2 kg and r = 0.3m. Solve to get the required v.

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Updated: October 1, 2016
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