For the winter, a duck flies at 15 m/s due south against a gust of wind due north. If the wind is blowing at 5 m/s, calculate the resultant velocity of the duck.

Explanation:

The north direction is towards the positive y direction on the coordinates axis and the south is towards the negative direction of the coordinate axis.

If a duck flies at 15 m/s due south against a gust of wind, then the duck velocity will be -15m/s

If the wind is blowing at 5 m/s due north, the velocity of the wind will be +5m/s

The resultant velocity of the duck will be the sum of the velocity along the y - component = -15 + 5 = -10m/s

Hence the resultant velocity of the dock is -10m/s

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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