A light spring of constant 159 N/m rests vertically on the bottom of a large beaker of water. A 5.13 kg block of wood of density 608 kg/m 3 is connected to the top of the spring and the block-spring system is allowed to come to static equilibrium. What is the elongation ΔL of the spring?

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?