Awooden dowel has diameter of 1.2 cm . it floats in water with 0.4 cm of diameter above water determine density of watrer

The density of water will be 0.935 g/

Explanation:

It is sufficient to solve this as a 2D problem since the length of the dowel does not matter. Let p be the density of the dowel in g/cm^3, and take water density 1g/cm^{3}

The area of the whole circle is = 1.130

The angle from the center of the dowel to the two water line edges is

T = (2)arccos)

So the area exposed above water is sector minus triangle:

= 0.642 - 0.447

= 0.195

So, the weight of the dowel is balanced by the weight of water displaced:

1.130 p

= (1.130 - 0.195)

p = 0.935 g/

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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