Apressure cooker is a covered pot sealed everywhere except for a small circular opening in the top. a small weight placed over this opening determines the pressure at which steam is released from the pot. suppose that the radius of the opening is 0.491 mm and the weight is 0.763 n. find the maximum pressure inside the pot.

10^6 Pa

Explanation:

Radius of the opening, r = 0.491 mm = 0.491 x 10^-3 m

Force, F = 0.763 N

Pressure is defined as the thrust acting per unit area. Its SI unit is Pascal.

Pressure = force / Area

Area, A = πr² = 3.14 x 0.491 x 10^-3 x 0.491 x 10^-3 = 7.57 x 10^-7 m^2

Pressure

P = 1 x 10^6 Pascal

Thus, the pressure inside the pot is 10^6 Pa.

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