Two blocks of mass M kg and 2,5kg respectively are connected by a light, inextensible string. the string runs over a light ,frictionless pulley. the coefficient of static friction is 0,2. calculate the tension in the string. calculate the minimum value of M that will prevent the blocks from moving . the block of unknown mass M is now replaced with a block of mass 5kg. the 2,5kg block now accelerates downwards. the coefficient of kinetic friction between 5kg and surface is 0,15. calculate the magnitude of the acceleration of 5kg block ​

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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

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