A5.0 kg box is sliding across a waxed floor by the application of a 15 n east force. if the force of friction is 2.5 n west, what is the net force acting on the box? whis is the box's acceleration

1) 12.5 N east

There are two forces acting on the box along the horizontal direction:

- The applied force of 15 N east, we indicate it with F

- The force of friction of 2.5 N west, we indicate it with

Taking east as positive direction, we can write the two forces has

Therefore, the net force on the box will be:

And the positive sign means the direction is east.

2)

We can solve this part by using Newton's second law:

where

is the net force on the box

m is its mass

a is the acceleration

For the box in this problem,

(east)

m = 5.0 kg

Solving for a, we find the acceleration:

And the direction is the same as the net force (east)

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