Aperson places an object on the shelves. 1. at which location on the shelves (w, x, y, or z) would the object have the most gravitational potential energy? explain your answer. a book with a mass of 0.21 kg is placed at location x. a magazine with a mass of 0.11 kg is placed at location y. 2. does the book or the magazine have more potential energy? show your calculations and include units in your answer. a 2.5 kg object is placed at location x where it has 10 j of potential energy. a person bumps the shelf, causing the object to fall to the ground. 3. assuming air resistance is negligible, explain how conservation of energy is demonstrated as the object falls to the ground. 4. calculate the speed of the 2.5 kg object just before it hits the ground. show your calculations and include units in your answer.

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