Business, 16.06.2021 05:00 hall1267

Bạn An có khoản thu nhập là 400 000 đồng dùng để mua hai loại sản phẩm giải trí: sách (Ký hiệu là S) và đĩa nhạc CD (ký hiệu là D). Giá của sách là
Ps = 30 000đ/bộ sách, giá của đĩa nhạc là PD = 20 000 đ/đĩa. Tổng giá trị hữu dụng của
bạn An khi sử dụng hai sản phẩm này lần lượt là :
TU S = - QS2 + 10 QS
TU D = - 2QD2 + 20 QD
a. Xác định lựa chọn tối ưu của bạn An.
b. Tổng giá trị hữu dụng tối đa của bạn An là bao nhiêu?

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Answer from: Quest

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.

Answer from: Quest

i would prefer to go with the news article for nate, its recent and updated and stores a lot of information

Answer from: Quest

those r all of them i believe

Answer from: Quest

the answer is: a greater percentage chance of loss

high risk investments had the characteristic of higher percentage of great return accompanied with higher percentage chance of loss.

this type of investments usually only suitable for investors that have enough capital to survive in case one or more of their investments fail. examples of high-risk investments are stocks and currencies.

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Bạn An có khoản thu nhập là 400 000 đồng dùng để mua hai loại sản phẩm giải trí: sách (Ký hiệu là S...

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