Alever has a total length of 12 meters with a fulcrum at the exact center of the lever. which best describes how to double the mechanical advantage of the lever? move the fulcrum 2 meters away from the side on which the force is applied. move the fulcrum 2 meters toward the side on which the force is applied. move the fulcrum 4 meters away from the side on which the force is applied. move the fulcrum 4 meters toward the side on which the force is applied.

Move the fulcrum 2 meters away from the side on which the force is applied.

Explanation:

The mechanical advantage of a lever is given by:

where

Fout is the output force

Fin is the input force

a is the distance between the point of application of the input force and the fulcrum

b is the distance between the load (output force) and the fulcrum

In this problem, we have a lever of total length 12 m. Initially, the fulcrum is exactly at the center of the lever, so

And so the mechanical advantage is

In order to double the MA, the value of a (distance between the input force and the fulcrum) must be twice that of b (distance between the load and the fulcrum):

We also know that

So, the solution to this system is

which corresponds to the following option:

Move the fulcrum 2 meters away from the side on which the force is applied.

(which means increasing a from 6 meters to 8 meters)

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