Apitching machine is programmed to pitch baseballs horizontally at a speed of 79 mph . the machine is mounted on a truck and aimed backward. as the truck drives away from a man at a speed of 55 mph , the machine shoots a ball towards him. a truck drives away from a man holding a baseball glove. a pitching machine in the bed of the truck pitches a baseball towards the man. determine the correct relative speed for each object pair. the speed of the pitching machine relative to the truck the speed of the pitched ball relative to the truck the speed of the pitching machine relative to the man the speed of the pitched ball relative to the man

Some material consisting of a collection of microscopic objects is kept at a high temperature. a photon detector capable of detecting photon energies from infrared through ultraviolet observes photons emitted with energies of 0.3 ev, 0.5 ev, 0.8 ev, 2.0ev, 2.5ev, and 2.8ev. these are the only photon energies observed. (a) draw and label a possible energy-level diagram for one of the microscopic objects, which has four bound states. on the diagram, indicate the transitions corresponding to the emitted photons. explain briefly. (b) would a spring–mass model be a good model for these microscopic objects? why or why not? (c) the material is now cooled down to a very low temperature, and the photon detector stops detecting photon emissions. next, a beam of light with a continuous range of energies from infrared through ultraviolet shines on the material, and the photon detector observes the beam of light after it passes through the material. what photon energies in this beam of light are observed to be significantly reduced in intensity (“dark absorption lines”)? explain briefly.