While moving a 13 kg refrigerator, an upward force of 28 n is applied 52 degrees above the horizontal, so that it accelerates from rest at 1.2 m/s2. what is the frictional force between the refrigerator and the floor?

the frictional force is 1,63 N

Explanation:

We use the second law of movement proposed by Newton and with the help of a free body diagram, we can get the equations for the solution.

In the image attached, we can see a completely analysis of the refrigerator under the different forces and the equations. We must understand the relationship between the normal force and the kinetic friction coefficient.

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