In order to be safe going around a loop the centripetal acceleration cannot exceed (see problems from yesterday).

in order to be safe the centripetal acceleration should be higher than 39.2 m/s²

Explanation:

Assuming no friction while travel around the loop then we can apply the conservation of energy

where

K = kinetic energy = 1/2*m*v²

and m= mass , v= velocity at the bottom

K = kinetic energy = m*g*h , where g= gravity and h= height from the bottom of the loop

then by conservation of energy

Energy in the bottom of the loop = K + V(=0 because of h=0) = K = (1/2)*m*v²

Energy in the top of the loop = K(=0 in the limiting case of v=0 , that is falling from the loop) + V= V = m*g* 2R

where R= radius of the loop

then

Energy in the bottom of the loop=  Energy in the top of the loop

(1/2)*m*v²= m*g* 2R

(1/2)*v²= 2*g* R

v²/R = 4*g

the centripetal acceleration ac is defined as

ac= v²/R= 4*g

then since g=9.8 m/s²

ac= 4*9.8 m/s² = 39.2 m/s²

therefore in order to be safe the centripetal acceleration should be higher than 39.2 m/s²

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