A plane flying horizontally at a speed of 80 m/s at an elevation of 300 m drops a package of supplies. Five seconds later, the plane drops a second package. How far apart are the two packages after they hit the ground? (ignore air resistance and assume that the packages don't bounce, roll, or slide after hitting the ground)

400m

Distance apart = (80)(5) = 400m

Both packages would perform projectile motion when falling to the ground. Since horizontal displacement moved by both packages are the same, their difference would only be due to the additional distance travelled by the plane during the 5 second interval between dropping both packages.

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

+15-35=-20

going in opposite directions