physics

A tetherball leans against the smooth, frictionless post to which it is attached.The string is attached to the ball such that a line along the string passes through the center of the ball. The string is 1.20m long and the ball has a radius of 0.120mwith mass 0.380kg. What is the force the pole exerts on the ball?

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asked by Erin
  1. Look at the angle the string makes with the pole.

    .12/1.2=sinTheta

    Now draw the vector diagram at the ball: mg downard, Tension along the string, and H the horizontal force.

    h/mg=TanTheta

    For this angle, you can use the small angle approximation that sine and tangent are equal.

    H/mg=.1

  2. .374

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