Ablock is pulled up a ramp inclined at 25 degrees. there is an applied force of 3.2 n, 20 degrees above the plans of the ramp. what is the coefficient of friction? what is the mass of the block?

hints given to us: use the angle and fa to find the sliding force
then use the equivalent triangle to find fn
then use ff and fn to find coefficient of friction.

i am lost at the equivalent triangle.

iron would move it is magnetic there is a mag field around the current in the wire

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