Abattery can be modeled as a source of emf in series, with both a resistance of 10ωand an inductive reactance of 5

ω for a maximum power delivered to the load, the load should have a resistance of rl=10ωan inductive reactance of zero, and a capacitive reactance of 5

ω.with this load, is the circuit in resonance?

a) yes

b) no

c) it depends on the voltage provided by the battery.

with this load, what fraction of the average power, put out by the source of emf, is delivered to the load?

a) 0

b) 0.2

c) 0.5

d) 0.7

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.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Atypical jetliner lands at a speed of 146 mi/h and decelerates at the rate of (10.4 mi/h)/s. if the jetliner travels at a constant speed of 146 mi/h for 1.5 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest?