Two students are share how to calculate the kinetic and potential energy when the skateboard is halfway down the ramp. In the space below, explain which method is correct and why. Method A “The kinetic energy is half the skater’s original potential energy because they are halfway down the ramp.” Potential energy = mass • acceleration due to gravity • height Kinetic energy (halfway down) = potential energy/2 Method B “The kinetic energy is twice the skater’s original potential energy because they are halfway down the ramp.” Kinetic energy = ½ • velocity/2 Kinetic energy = 2 • (½ • mass • velocity)

they start with the same

multiple

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