A new technology company is marketing drones for residential use. The bar graph shows the relation between number of sales and three types of marketing strategies over the company’s first five months of operation. What are the two biggest advantages of using a bar graph to display this kind of data? The graph provides a comparison of the different marketing strategies. The graph helps in selecting the best marketing strategy to improve sales. The graph helps to predict future sales near the end of the calendar year. The graph indicates how many people see the posted advertisements. The graph gives information about the number of people who have received emails.

What should the power status of a circuit be when measuring resistance with an ohmmeter?

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.

In a set amount of time, a battery supplies 25j of energy to an electric circuit that includes two different loads. one of the loads produces 10 j of heat energy during this time interval. how much heat energy is produced by the second load in this time? explain your answer