Assume that abby, ben, clara, joe, and matt are the only citizens in a community. a proposed public good has a total cost of $1,000. all five citizens will share an equal portion of this cost in taxes. the benefit of the public good is $220 to abby, $210 to ben $210 to clara, $180 to joe, and $120 to matt. who are likely to vote in favor of this proposal? a. ben, clara, and joe b. abby, ben, clara, and joe c. ben, clara, joe, and matt d. abby, ben, and clara

(D) Abby, Ben, and Clara

Explanation:

Given that each of the five citizens will share the cost of the public good equally (that is, $200 each), citizens who derive benefits greater than $200 are likely to vote in favor of an equal share of the cost since this option will result in a net benefit of the public good to them.

For instance, net benefit to Abby = $220 benefit - $200 cost = $20 net benefit.

On the other hand, citizens who derive benefits worth less than $200 are less likely to vote in favor of an equal share since an equal share will result in a net loss to them.

For instance, net loss to Matt = $120 benefit - $200 cost = $80 net loss.

Therefore, Abby ($220), Ben ($210) and Clara ($210) are likely to vote in favor of a proposal for an equal share of the cost, since the benefit they derive is greater than the cost in an equal share $200.

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.

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