Ethanol is flowing in a pipe and at all points completely fills the pipe. At point AA in the pipe the gauge pressure is pp and the cross-sectional area of the pipe is 0.0500 m2m2. The other end of the pipe (point BB) is open to the air, has cross-sectional area 0.0200 m2m2, and is at a vertical height of 9.00 mm above point AA. Part A What must the gauge pressure pp be at AA if the volume flow rate out of the pipe at point BB is 0.0800 m3/sm3/s

i think its

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