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A stone of mass 0.31 kg is tied to a string of length 0.65 m and is swung in a horizontal circle with speed v. The string has a breaking-point force of 70 N. What is the largest value v can have without the string breaking?

  • Physics -

    tension in the string = m*V^2/r
    max tension is 70N
    so Vmax = sqrt(70*r/m)

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