Arock climber is about to haul up 100 n (about 22.5 lb) of equipment that has been hanging beneath her on 40 m of rope weighing 0.8 n/m. how much work will it take to lift all this? ? 8) a vertical cylindrical tank measures 30 ft high and 20 ft in diameter. it is full of kerosene weighing 51.2 lb/ft. how much work (ft-lb) does it take to pump the kerosene to the level of the top of the tank (i. e to pump all the kerosene out the top of the tank).

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?