# Physics

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?

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1. 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.

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posted by MathMate
2. Where did the 40/2 come from?

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posted by Yas
3. 40/2 Came from Steve's answer, get with it.

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