Aman 6.00 ft tall approaches a street light 15.0 ft above the ground at the rate of 4.00 ft/s. how fast is the end of the man's shadow moving when he is 14.0 ft from the base of the light?

Explanation:

As per given figure let say the tip of the shadow is at distance "x" from the base of the lamp

so here we have

so we have

now we have

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