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Homework Help: physics

Posted by Melanie on Monday, December 19, 2011 at 9:50pm.

A string under a tension of 43 N is used to whirl a rock in a horizontal circle of radius 3.3 m at a speed of 26.46 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.635 m long and the speed of the rock is 80.5 m/s, the string breaks. What is the breaking strength of the string? Answer in units of N

• physics - drwls, Tuesday, December 20, 2011 at 1:52am

  Spring tension is T = M V^2/R.
  
  They do not tell you the value of M after the string is pulled in, but you can calculate it from the initial conditions with the larger radius. The mass will not change.
  
  M = T*R/V^2
  

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