Pt Juan argues that when you burn coal, you use up the coal, and hence you use up all of its energy, and this results in a net loss of energy in the universe. How
could you fix Juan's argument? The total energy in the universe remains constant because
A. the chemical energy in the coal is converted into thermal energy
B. the kinetic energy in the coal is converted into potential energy
C. the elastic potential energy in the coal is converted into thermal energy
D. the gravitational potential energy in the coal is converted into elastic potential energy

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

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015