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15. A 1.2-kg mass is tied on the end of an 30.0 cm long rope and whirled around in a vertically-oriented circle at an ever-increasing

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15. A 1.2-kg mass is tied on the end of an 30.0 cm long rope and whirled around in a vertically-oriented circle at an ever-increasing rate. The rope breaks as the frequency of rotation reaches 5.2 Hz. What maximum mass could this rope support if it is simply held vertically, while the mass is at rest? Provide an appropriate free-body diagram. (6 marks)

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