3 Below, someone is trying to balance a plank with stones. The plank has negligible weight. a Calculate the moment of the 4 N force about O. b Calculate the moment of the 6 N force about O. - 2 m * 2 m-* 4 m Р 1 4N 6N

Moment of the 4N force = 16Nm

Moment of the 6N force = 12Nm

Explanation:

Find the diagram attached.

Moment of a force is the product of the force and the perpendicular distance from the point of application

For the 4N force

Distance of the force from O is 4m

Moment of the 4N force = 4N * 4m

Moment of the 4N force = 16Nm

For the 6N force

Distance of the force from O is 2m

Moment of the 6N force = 6N * 2m

Moment of the 6N force = 12Nm

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