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Posted by on Sunday, January 17, 2010 at 11:09pm.

An iron bolt of mass 80.0 g hangs from a string 38.8 cm long. The top end of the string is fixed. Without touching it, a magnet attracts the bolt so that it remains stationary, displaced horizontally 28.0 cm to the right from the previously vertical line of the string.
(a) Find the tension in the string.
(b) Find the magnetic force on the bolt.

  • Physics - , Sunday, January 17, 2010 at 11:21pm

    The string makes an angle of sin^-1 28/38.8 = 46.2 degrees with the vertical.

    Do a force balance in vertical and horizontal directions.

    T cos 46.2 = Weight = m g
    Solve for T, the tension. Then use this equation.

    T sin 46.2 = magnetic force

  • Physics - , Monday, January 18, 2010 at 4:35pm

    Thanks so much for your help drwls!!

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