An ice block floating in a river is pushed through a displacement d with arrow = (13 m)i hat − (13 m)j along a straight embankment by rushing water, which exerts a force f with arrow = (230 n)i hat − (140 n)j on the block. how much work does the force do on the block during the displacement?

Work done, W = 4810 Joules

Explanation:

Given that,

Force acting on the block,

Displacement in water,

To find,

Work does the force do on the block during the displacement.

Solution,

Let W is the work done by the force on the block. We know that the expression for the work done is given by :

We know that,

i.i = j.j = k.k = 1

W = 2990 + 1820

W = 4810 Joules

So, the work done by the force on the block during the displacement is 4810 Joules.

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