A block-and-tackle pulley is used to lift an object weighing 2000 N using an effort force of 500 N. Determine the mechanical advantage of the pulley. A. 1500 B. 2500 C. 0.24 D. 4​

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?