Three balls with the same radius 19 cm are in water. ball 1 floats, with half of it exposed above the water level. ball 2, with a density 856 kg/m^3 is held below the surface by a cord anchored to the bottom of the container, so that it is fully submerged. ball 3, of density 1297 kg/m^2, is suspended from a rope so that it is fully submerged. assume the density of water is 1000 kg/m^3

not moving. pos accel,

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

you can cut your hand off if your not