A radio tower is located 400 feet from a building. From a window in the building, a person determines that the angle of elevation to the top of the tower is 36°, and that the angle of depression to the bottom of the tower is 25°. How tall is the tower? (Round your answer to four decimal places.)

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same

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?

Make a drawing of the electric field lines around a positive charge, then make a second drawing of the electric field lines around a negative charge.