Given a person leaning against a very solid and very thick wall. Does the wall exert a force on the person? Explain and draw a force diagram. Carefully label each force. If a person pushes on that same wall, but with greater force, how does the wall respond to this new force? Explain and draw a force diagram. Carefully label each force.

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?