Asubmarine is powered by a nuclear reactor that consists of the reactor coolant, steam generation and other support systems that supply steam to the engine room. the pressurized water reactor (pwr) uses 20-45% enriched uranium-235 fuel to produce 165 mw of power, driving two 26 mw steam turbines that generate electricity and drive the propeller shaft the submarine has a displacement of 19800 tons submerged, crew of 105, length of 185 m and width of 12 m. calculate the speed of the submarine when surfaced and submerged in kn (knots) or km/h. a) use the pwr data to determine amount of power generated & use shaft work correlation to calculate the submarine propulsion when surfaced & submerged b) the speed of the submarine must be realistic as the fastest submarine speed recorded is 32 kn. show all necessary calculations c) specify no of screws/blades from your calculation

Which expression allows you to determine the mechanical advantage of an inclined plane? a. height of plane / input force b. length of plane / input force c. length of plane / height of plane d. height of plane / length of plane

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 science and physics what is the standard unit of measure for speed?