Ascrew is a type of simple machine. if we look closely at a screw, we see that it is really a wrapped around a central core.

D. Inclined Plane

" Try this! Take a piece of paper and fold it into a right triangle. Wrap it around a pencil. That is a screw - an inclined plane wrapped around a central core."

-usatestprep

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

your answer is, orbit around the nucleus