At a particular instant in time, a train is traveling north at 5 m/s and decelerating at a rate of 0.5 m/s2 as it enters a right turn (eastward) with a radius of curvature of 100 m. at the front of the train a record player is spinning a record on a horizontal surface at a rate of 6 rad/s counter-clockwise with an angular deceleration of 0.5 rad/s2. on top of the spinning record, an ant is walking directly toward the center with a velocity of 0.1 m/s and an acceleration of 0.01 m/s2. at the same instant that the train enters the eastward curve, the ant is 0.2m from the center of the record and is located directly to the east of the center, such that he is walking due west. what is the magnitude of the ant's total acceleration relative to the ground?

does anyone know or what?

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