(a) what is the sum of the following four vectors in unit-vector notation? for that sum, what are (b) the magnitude, (c) the angle in degrees, and (d) the angle in radians? positive angles are counterclockwise from the positive direction of the x axis; negative angles are clockwise. : 6.00 m at + 0.900 rad : 5.00 m at - 75.0° : 4.00 m at + 1.20 rad : 6.00 m at - 210°

6m at 0.9 radian means 6m at

Since positive angles are counter clockwise

6m at can be written as 6*cosi+6*sinj = 3.73i+4.70j

5m at can be written as 5*cosi+5*sinj = 1.294i-4.83j

4m at 1.2 radian means 4m at

4m at can be written as 4*cosi+4*sinj = 1.45i+3.73j

6m at can be written as 6*cosi+6*sinj = -5.20i-3j

a) So sum of the vector = 1.274i+0.6j

b) Magnitude =

c) Angle,  

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

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle