A binary star system, in which the star (a) has a radius of Ra = 1.7 Ro, an effective temperature of Ta = 9900k , and a mass of the star(a) Ma = 2.0 Mo . The star (a) was observed with a wavelength ( 6000 A°) and the amount of change At wavelength (0.8 A°), the star (b) has a radius of Rb = 0.9Ro, a temperature of Tb = 5300 K, and a mass of the star (b) Mb = 0.9Mo. These two stars orbit in circular orbits around their common center of mass, with a period P = 40 days What is the orbital speed of each star with respect to the center of mass?​

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

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