Explore In the AC generated illustrated above, a conducting loop rotates in the magnetic field of two permanent magnets. The magnetic field lines fill the gap from north to south. As the loop rotates, the magnetic flux through the loop changes from maximum in a given orientation to zero, then to maximum in the opposite orientation. This produces an induced voltage in the loop that is sinusoidal, where N is the number of turns in the rotating loop (N = 1 in the animation), B is the magnetic field produced by the permanent magnets, A is the area of the rotating loop, and ω is the angular frequency of the rotating loop.4

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.

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points