1 ponto Um avião decolar em uma pista retilínea. Ele inicia seu movimento na cabine com velocidade nula e corresponde a ela com aceleração constante de 2,0 m / s? Até o instante em que levanta o voo, com uma velocidade de 80 m / s, antes de terminar uma pista. O menor comprimento possível dessa pista é

a and b sometimes have a positive value

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

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

elctricity and magnet is conversion to it