Ablock of mass m = 3 kg is held against a wall with a force f applied at an angle φ, as shown. there is a coefficient of static friction μs = 0.25 between the block and the wall. if φ = 60°, then the minimum f required to hold the block up is

29.7 N

Explanation:

At the minimum force F, the block will just begin to slide down, so friction force will be pointing up.

Sum of the forces in the x direction:

∑F = ma

N − F cos φ = 0

N = F cos φ

Sum of the forces in the y direction:

∑F = ma

Nμ + F sin φ − mg = 0

Substitute:

(F cos φ)μ + F sin φ − mg = 0

F (μ cos φ + sin φ) = mg

F = mg / (μ cos φ + sin φ)

Given m = 3 kg, μ = 0.25, and φ = 60°:

F = (3)(9.81) / (0.25 cos 60° + sin 60°)

F ≈ 29.7 N

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