As stated in the introduction, shear strength is another measure of the strength of a material. a shear force is a force that acts parallel to the plane in the material that breaks. a good example of a shear is that of a martial arts expert breaking boards or bricks with her hands. other applications in which shear forces and shear strength need to be known are geology, for studying earthquakes and landslides; fluid dynamics; and structural engineering. aluminum has a shear strength of 210 megapascals. when you bend aluminum foil around an edge (i. e., the edge of the box) and pull, you are effectively applying a shear force along the bent edge of the foil. if a roll of household aluminum foil is 30.0 centimeters wide and its thickness is approximately 15.0 micrometers, how much shear force is needed to pull off a sheet? assume that the force is applied equally along the whole width of the foil. express your answer in newtons to three significant figures. view available hint(s)

the bal will not change its velocity.

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

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.