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Difficult Eletrical angle force problem

  1. Mar 12, 2008 #1
    1. Two pith balls each have a mass of 1 g. and equal charge. One pith ball is suspended by an insulating thread. The other is brought to 3 cm from the suspended ball. The suspended ball is now hanging with the thread forming an angle of 30 degrees with the vertical. The ball is in equlibrium with Fe, Fg, and Ft.
    Calculate Fg, Fe, and the charge of the balls.

    2. F=kFaFb/dsquared

    3. I really have no idea how to start it. Is Fg just 9.8m? For the rest I don't know how to get the force.
  2. jcsd
  3. Mar 12, 2008 #2
    Draw the free body diagram for the ball hanging from the ceiling at an angle of 30 degrees. Since it is not moving, it is a statics problem, and you know that the net force on the ball is.......

    Once you have all your forces, break them into their components.
  4. Mar 12, 2008 #3

    Doc Al

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    Staff: Mentor

    Yes, the weight (Fg) = mg, where g = 9.8 m/s^2.

    Draw a diagram showing all the forces acting on the suspending pith ball. Apply the equilibrium conditions and solve for the other forces.
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