physics

A string under a tension of 50.0 N is used to whirl a
rock in a horizontal circle of radius 2.50 m at a speed of
20.4 m/s. The string is pulled in and the speed of the
rock increases. When the string is 1.00 m long and the
speed of the rock is 51.0 m/s, the string breaks. What is
the breaking strength (in newtons) of the string?

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  2. 👎
  3. 👁
  1. Split into 2 scenarios

    1. Fc=T

    so find mass using above formula

    ((mv^2)/r)=T
    m=0.3kg

    2. Find new tension with new values of velocity and radius and mass

    Fc=t
    ((mv^2)/r)=T
    T=780.3

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