Juliette (m = 59.0 kg) uses a giant kite to pull herself along a smooth surface. A s she approached a ramp, she gains a speed of 11.3 before letting go of the kite and launching off the skate ramp. Using ENERGY equations calculate how high above the ramp she goes (Hint: use the top of the ramp as h1 = 0 m).

   h = 6.41 m

Explanation:

For this exercise we use the law of conservation of energy

starting point. When it's on the ramp

       Em₀ = K = ½ m v²

final point. When it is at the highest height

       Em_f = U = m g h

We assume that when it is at the highest height it will stop and possibly return to the ramp

as there is no friction, the energy is conserved

           Em₀ = Em_f

           ½ mv² = m g h

            h =

let's calculate

            h = ½ 11.3² / 9.8

            h = 6.41 m

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