text: # physics
  
  posted by .
  
  A light string has its ends tied to two walls separated by a distance equal to five-eighths the length of the string. A 53 kg mass is suspended from the center of the string, applying a tension in the string.
  
  What is the tension in the two strings of length L/2 tied to the wall? The acceleration of gravity is 9.8 m/s^2.
  Answer in units of N.
  
  • physics -
  
  Draw the triangles.
  
  half the weight is supported by each side.
  
  Let theta be the angle from the wall horizontal to the string. Then on each side, SinTheta=Weight/(2*tension)
  
  But tan cosTheta= half wall distance/halfstring distance
  costheta= 5/8
  
  But sin^2theta+cos^2theta=1
  or weight^2/4Tension^2+25/64=1
  solve for tension.
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