Physics-
General
Easy

Question

If the time period of a pendulum is 1 sec, then what is the length of the pendulum at point of intersection of l-T and l minus T to the power of 2 end exponent graph

  1. 25 cm    
  2. 21 cm    
  3. 22 cm    
  4. 27 cm    

The correct answer is: 25 cm


    T equals 2 pi square root of fraction numerator l over denominator g end fraction end root semicolon T to the power of 2 end exponent equals 4 pi to the power of 2 end exponent fraction numerator l over denominator g end fraction
    l equals fraction numerator g over denominator 4 pi to the power of 2 end exponent end fraction equals fraction numerator 9.8 over denominator 4 cross times 9.8 end fraction equals 0.25 equals 25 c m

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