Amigrating robin flies due north with a speed of 12 m/s relative to the air. the air moves due east with a speed of 6.7 m/s relative to the ground. part a what is the robin's speed relative to the ground?

Here it is given that speed of migrating Robin is 12 m/s relative to air

so we can say that

North

so it will be

Let North direction is along Y axis and East direction is along X axis

also it is given that speed of air is 6.7 m/s relative to ground

now as we know by the concept of relative motion

now by rearranging the terms

now we need to find the speed of Robin which means we need to find the magnitude of its velocity which we found above

So here we will say

so the net speed of Robin with respect to ground will be 13.7 m/s

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