Two boys, shrijan having weight 600N and shrijesh having weight 300N are playing see-saw. If shrijan is sitting at 2m from fulcrum, where should shrijesh sit from fulcrum to balance shrijan? pl help me

Shrijesh should be located at 4[m] from the fulcrum point.

Explanation:

We must keep in mind that the moment around the point of rotation (fulcrum) must be equal, so that the bar remains in balance.

The moment for shrijan is:

So if the moment should be equal, the distance can be obtain from the same equation using the shrijesh's force or weight.

true tan speed = ang vel x radius

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