The power ratings of several motors are listed in the table. motor power brandy x 7,460 brandy y 7,650 brandy z 7,580 an advertising agency writes marketing material for a new motor (brand w) that has a power rating of 7,640 w. which statement comparing the motors can they truthfully use? brand w motor can finish any job faster than brand y motor can. there’s not a more powerful motor available. brand w motor does more work each second than brand x or brand z. every second, brand w motor does 7,640 n of your toughest work.

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.

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

70 give a real life example showing how sensory neurons work with the motor neurons