In a hydraulic lift, a 620 N force is exerted on a 0.20 m2 piston in order to support a weight that is placed on a2.0 m2 piston. How much pressure is
exerted on the narrow piston? How much weight(force) can the wide piston lift?

Pressure on the narrow piston = 3100

The wider piston can lift the weight up-to 6200 N

Explanation:

Given that the area of the narrow piston = 0.2

Applied force on the narrow piston, = 620 N

Area of the larger piston  = 2.0 .

As pressure = force/ area,

So. pressure exerted on the narrow piston,

There is liquid in between the narrow piston and the larger piston and according to Pascal's law, the pressure inside any liquid is uniformly distributed.

As the narrow piston is applying the pressure on the liquid which is equal to the external pressure applied on the narrow piston, i.e 3100 .

So, the uniformly distributed pressure in the fluid is 3100 .

Now, the liquids apply pressure on the larger piston,

as force = Area x pressure, so the applied on the larger piston, , by the liquid is

N

Hence, the wider piston can lift the weight up-to 6200 N.

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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