What is Wall: Definition and 756 Discussions

A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including:

Walls in buildings that form a fundamental part of the superstructure or separate interior rooms, sometimes for fire safety
Glass walls (a wall in which the primary structure is made of glass; does not include openings within walls that have glass coverings: these are windows)
Border barriers between countries
Brick walls
Defensive walls in fortifications
Permanent, solid fences
Retaining walls, which hold back dirt, stone, water, or noise sound
Stone walls
Walls that protect from oceans (seawalls) or rivers (levees)

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  1. Monique

    Cell wall and uptake of nutrients

    A cell wall is a rigid structure, so I wonder how organisms with such a structure are able to take up nutrients from their environment? If there is only a plasma membrane, vesicles can be formed which pinch off and thus take up nutrients from the environment and merge with other vesicles to...
  2. A

    Constant force exerted on the ball by the wall?

    a 2.5 kg ball strikes a wall with a velocity of 8.5 m/s to the left. The ball bounces off with a velocity of 7.5 m/s to the right. If the ball is in contact with the wall for .25s, what is the constant force exerted on the ball by the wall?
  3. S

    Tension in the string and the normal force exerted by the wall

    A uniform solid disk of mass M and radius R hangs from a string of length l attached to a smooth wall. We want the tension in the string and the normal force exerted by the wall. | |\ <--- I call this angle A |_\ |__\ |_(..) <--- that's a disk | | So I have it set up so the...
  4. S

    How Far Can a Man Climb a Ladder Before It Slides?

    [SOLVED] Ladder on a wall problem I'm stumped on this problem. I've solved for the distance the person can climb in terms of N(b), but I can't get N(b) in known terms. A ladder of mass 2M and length 2L is kept on a rough horizontal floor and leaned against a rough vertical wall. The...
  5. N

    Pushing a 6kg Pic Against a Wall: Find the Force Needed

    i don't understand this..the way the forces go:frown: if someone could show me how to do it and the steps..that would be great: The static friction coefficient btw a wall and a pic is 0.7 while the kinetic one is 0.3. By what force shoudl one push the 6kg pic against the wall so that it...
  6. H

    Energy of an Infinitely Rigid Object Impacting a Wall

    If you had an infinitely rigid object and threw it against an infinitely rigid wall, where would the energy go?
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