Aperfect gas expands in a frictionless nozzle. given that the expansion is isentropic, determine the following conditions at the final pressure: 1) velocity, 2) mach number, 3) temperature and 4) area per unit mass flow. how does the final flow area compare with the throat area for a given mass flow? the specific heat ratio is 1.4 and the molecular weight is 30 a. conduct this analysis for stagnation conditions po = 4 mpa, to-2500 k to ambient pressure 0.1 mpa. b. conduct this analysis for stagnation conditions po = 2 mpa, to-2500 k to ambient pressure 0.1 mpa. c. conduct this analysis for stagnation conditions po = 4 mpa. to - 3500 k to ambient pressure 0.1 mpa.

d. air pressure decreases as altitude increases.

heats surface water up

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia