posted by Steve .
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?
If the square sign is supported at only one point, and that point is a corner, it will hang with that corner pointing straight up. It won't be the upper right anymore.
I obviously don't get the picture here.