A10 n horizontal force is applied to a 50 n block initially at rest on a rough horizontal surface. the box will not move in this situation. to start it moving, a second person pulls vertically upward on the box. if the coefficient of static friction is 0.5, what is the smallest vertical force for which the box will move?

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?