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Posted by on Tuesday, December 7, 2010 at 12:07am.

A sign is supported at its top right corner, point P. The sign is a square with 40 cm on each side and has 8.0 kg mass. What is the magnitude of the horizontal force that P experiences?

  • Physics - , Tuesday, December 7, 2010 at 9:33am

    If the sign is supported only at P, it requires a moment connection and there is no horizontal force.

    Assume that the sign is supported at P and the bottom of the same side (40 cm down) is butted against the support.

    Take moments:
    mg * (40/2) = P*40

    Solve for P.

  • Physics - , Thursday, April 21, 2011 at 12:56pm

    Where did the 40/2 come from?

  • Physics - , Wednesday, April 24, 2013 at 1:40pm

    40/2 Came from Steve's answer, get with it.

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