One of newtons laws? An object at rest stays at rest until acted upon by an outside force? If that's what your asking
The force that holds a picture on a wall is the force of friction between the back of the picture frame and the wall. This friction prevents the picture from sliding or falling off the wall.
magnetic force
No, a picture on a wall is not a balanced force. Balance refers to the equality of forces acting in opposite directions, resulting in no change in an object's motion. In this case, the force of gravity acting on the picture is balanced by the force exerted by the wall, allowing the picture to remain in place.
The force that holds a picture on a wall is the force of friction between the picture hook/nail and the wall, as well as gravity acting on the picture downward. These forces combine to keep the picture in place.
The safest way to mount a picture is to always have another person with you to help hold the picture or the ladder. If the picture weighs less then 20 lbs then a standard nail in the wall will be sufficient to hold the picture. However, if the picture is heavier then one would want an anchor in the wall instead of the nail.
The main forces that affect a picture hanging on a nail on a wall are gravity pulling the picture downwards, tension in the nail supporting the weight of the picture, and the frictional force between the picture frame and the wall that keeps it from sliding.
Moore Picture Hangers Drywall Hanger
I would guess that the picture was not properly secured if a picture fell off the wall.
The force of gravity, weight = mg.
stupid force
The normal force is equal in magnitude but opposite in direction to the force applied against the wall. If the object is held against the wall with a force, then the normal force acting on the object will be equal in magnitude to that force. If the mass of the object is given, you can calculate the force needed to hold it against the wall using Newton's second law (F = ma).
Assuming the question really is "Who took the first picture of the entire Great Wall of China" I do not see how this is possible, given the length of the wall. It would be possible to take a picture of the entire Great Wall from a low-orbiting satelite or space shuttle, except portions of the wall no longer exist, so it would not be the "complete" wall.