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A 2.71 kg disc is attached to the end of a string whose length is 0.55 m. The disc slides without friction on a horizontal surface as indicated in the Figure. If the string can withstand a maximum tension of 134.7 N, what is the maximum tangential speed the disc can have before the cord breaks?

1447_A disc is attached to the end of a string.gif

The disc is whirled in a vertical circle of the same radius about a fixed point. Find the tension at the top if the speed at the top is 2.6538 m/s.

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