Learning goal: to learn to apply the law ofconservation of energy to the analysis of harmonic oscillators.

systems in simple harmonic motion, or harmonicoscillators, obey the law of conservation of energy just likeall other systems do. using energy considerations, one can analyzemany aspects of motion of the oscillator. such an analysis can besimplified if one assumes that mechanical energy is not dissipated. in other words,

e=k+u={\rm constant},

where eis the total mechanical energy of the system, k is the kinetic energy, and uis the potential energy.

see earlier

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