Question

While trying to decide where to hang a framed picture, you press it against the wall to keep it from falling. The picture weights 9.5 N and you press against the frame with a force of 19 N at an angle of 30° from the vertical.

What is the coefficient of static friction between the wall and the picture?

The frictional force exerted on the picture by the wall can have two possible directions. Explain why.

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