Allesandra would like to work in a school environment, and she knows that she would prefer a career in which she spends lots of work time walking around rather than sitting in an office. a. Elementary school teacher b. Administrative support worker c. Instructional designer d. High school principal

a. Elementary school teacher

Explanation:

An elementary school teacher refers to an individual who is an educational professional and is typically saddled with the responsibility of developing and implementing lesson plans for students in the classroom.

Basically, an elementary school teacher educate students on vital subjects such as mathematics, english language, verbal studies, quantitative reasoning etc. which forms the foundation of a student's future career, observe, analyze and evaluate the performance of each pupil, coordinate all classroom activities, enforce school and classroom rules etc. All of the aforementioned responsibilities are executed or achieved by walking around the classroom to effectively and efficiently monitor and evaluate the pupils.

In this scenario, Allesandra would like to work in a school environment, and she knows that she would prefer a career in which she spends lots of work time walking around rather than sitting in an office.

Hence, the education career which would be the best option for Allesandra, is to work as an Elementary school teacher.

sound is invisible, but sometimes we can feel it. when a kettle-drum is thumped with a stick that time the tight drum skin moving up and down very quickly for some time and then it pumped sound waves into the air. loudspeakers also work in a similar manner.

components of a speaker:

electromagnet

in order to translate an electrical signal into an audible sound, an electromagnet is used in looudspeakers

  suspension

suspension is used to   center the voice coil in the gap of the magnet and it exerts a restoring force to keep it there. suspension is used to limits the maximum mechanical excursion of the diaphragm and voice coil.

voice coil

voice coil is a coil of wire which is attached to the apex of a loudspeaker cone. it provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.

cone

in a   loudspeaker, a   thin, semi-rigid membrane attached to the voice coil, which moves in a magnetic gap due to which it vibrates   and produced sound. it is known as diaphragm and it can also be called a cone, though not all speaker diaphragms are cone-shaped.

surround

surround is also known as front suspension. surround is used to join the cone to the chassis. together with the suspension it controls the cone excursion, and it is also used to   determine how energy which is   travelling through the cone is absorbed, and how the speaker limits when it reaches the ends of its travel.

dustcap

dustcap is used to protect the voice coil from dust and dirt. it is a part of the cone.

how speaker work

the outer part of the cone is fastened to the outer part of the loudspeaker's circular metal rim. the inner part is fixed to   voice coil that sits just in front of a permanent magnet . when loudspeaker is hooked up to a stereo, electrical signals feed through the speaker cables into the coil. it will convert the coil into an electromagnet magnet . when electricity flows back and forth in the cables, the electromagnet either repels or attract the permanent magnet. this moves the coil back and forth, and it pull and push the loudspeaker cone. like a drum skin vibrating back and forth, the moving cone pumps sounds out into the air.in this way loudspeakers works.

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy