1. An object initially at rest falls from a height H until it reaches the ground. Two of the following energy bar
charts represent the kinetic energy K and gravitational potential energy Us of the object-Earth system at
two positions. The first position is when the object is initially released, and the second position is when the
object is halfway between its release point and the ground. Which two charts could represent the mechanical
energy of the object-Earth system? Select two answers.

what is the question because that is not a question.

radiation warms things up temp rises convection currents air circ windy weather

its a 5.5 n

glad that

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