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Forces on a hinged board used as a lever

  1. Nov 26, 2006 #1
    I'm having trouble with this one. Any help would be appreciated.

    A 3 m board of mass 4.5 kg is hinged at one end. A force F is applied vertically at the other end to lift a 75 kg block, which rests on the board 80 cm from the hinge, as shown in Figure 12-35.

    (b) Find the force exerted by the hinge at this angle. (in components)
    (c) Find the magnitude of the force F if this force is exerted perpendicular to the board when = 30°.
    (d) Find the force exerted by the hinge in this case (in components)
  2. jcsd
  3. Nov 27, 2006 #2


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