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## Homework Statement

The problem is

While trying to decide where to hang a framed picture, you press it against the wall to

keep it from falling. The picture weighs 5.0 N and you press against the frame with a

force of 6.0 N at an angle of 40ºfrom 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.

## Homework Equations

ƩFx=0

ƩFy=0

f≤μN

## The Attempt at a Solution

I used ƩFx=0,

f=6cos40°-5

ƩFy=0,

N=6sin40°

Then μ=(6cos40°-5)/6sin40°

However, I can't figure out what is the other possible direction.

The one possible is parallel to the wall surface and upward.

what about the other?

Confused.