A hydroelectric power plant uses spinning turbines to transform the kinetic energy of moving water into electric energy with 80 % efficiency. That is, 80 % of the kinetic energy becomes electric energy. A small hydroelectric plant at the base of a dam generates 40 MW of electric power when the falling water has a speed of 18 m/s.
What is the water flow rate −kilograms of water per second − through the turbines? Express your answer with the appropriate units.

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