Physics-
General
Easy

Question

A 0.5kg ball is suspended to a string of length 1m and is rotated in a vertical plane by holding one end of the string. If it makes 30 rpm then the maximum tension in the string is .... open square brackets pi to the power of 2 end exponent equals 10 close square brackets.

  1. 19.9N    
  2. 9.9N    
  3. 1.9N    
  4. 29.9N    

The correct answer is: 9.9N


    T minus m g equals m r w to the power of 2 end exponent
    T minus m g equals fraction numerator 1 over denominator 2 end fraction cross times 1 cross times pi to the power of 2 end exponent
    w equals 30 cross times fraction numerator 2 pi over denominator 60 end fraction
    w equals pi r a d divided by s
    T equals 5 plus m g
    T equals 5 plus fraction numerator 1 over denominator 2 end fraction left parenthesis 9.8 right parenthesis
    T equals 9.9 N

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