All of the following are examples of velocity except
O
A. a bicyclist traveling 25 km/hr northwest
O
B. a northbound train moving at 60 km/h
O
C. a dog trotting at 2km/hr eastward toward
his master's home
O
D. a unicyclist riding 1km/hr on a tightrope
the circus

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?