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Ball hanging from ceiling

  1. Jan 31, 2008 #1
    A 1.7-kg ball tied to a string fixed to the ceiling is pulled to one side by a force to an angle of 33.9° from the ceiling. Just before the ball is released and allowed to swing back and forth, (a) how large is the force that is holding the ball in position and (b) what is the tension in the string?



    3. The attempt at a solution

    I tried 16.66N for the force part a because I thought it would be the mass*gravity, but that's not right.
     
  2. jcsd
  3. Jan 31, 2008 #2
    The sum of all the forces of the ball must be 0. This is true for both the vertical and the horizontal components. There is the force of gravity (vertical), the force that´s pulling the ball aside (horizontal) and the tension in the string wich has both a vertical and a horizontal component.
    Answer (b) first. The vertical component of the tension of the string should balance the gravitational force on the ball
     
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