You are in a hot-air balloon that, relative to the ground, has a veloc- ity of 6.0 m/s in a direction due east. you see a hawk moving directly away from the balloon in a direction due north. the speed of the hawk relative to you is 2.0 m/s. what are the magnitude and direction of the hawk’s velocity relative to the ground? express the directional angle rel- ative to due east.

6.32 m/s 18.43° northeast

Explanation:

We express the velocity of hawk as:

We consider positive x towards east and positive y due north. So the magnitude is simply the square root of the square components:

≈

And the angle with respect to the east should be with:

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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