Consider the following example. A risk-neutral worker can choose high or low effort. The worker's outside option is 0. The manager cannot observe the worker's action, but the manager can observe the realized revenue for the firm (either $100 or $200). The probability of each revenue depends on the worker's effort:
Low effort: cost of effort : $0 probability of low revenue ($100) : 75% probability of high revenue ($200) : 25%
High effort: cost of effort : $11 probability of low revenue ($100) : 25% probability of high revenue ($200) : 75%
The manager offers a contract which gives the worker a flat wage of $10 and a bonus of $20 if revenue is high. Given this payment scheme, the worker will put in___effort. The contract (is/is not)incentive compatible. The firm's expected profit is $.
The firm is considering an investment that would increase worker morale. By making work more enjoyable, the program would reduce the worker's cost of effort from $11 to $9. If it costs the firm $20 to implement this program, the firm's expected profit if they implement the program is $. The firm implement the program.

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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