1. Choose 18 companies traded on the NYSE. 2. Your timeline will begin For each stock, find the monthly closing prices for 61 months. The time frame you will use is 5 Jan 2016 through 3 Feb 2021. These data are easily found at Yahoo! Finance (http://finance. yahoo. com) [For reference go to Risk and Return Calculation Videos Posted on Learn, both explanation and excel example]. In Yahoo Finance enter a company’s stock symbol in the search field. Once you arrive at the company’s “Summary” page, click on the “Historical Data” link. Enter the required date range (5 Jan 2016 through 3 Feb 2021) and ensure that you have selected “monthly” then click on “Apply”. Click on “Download Data”. Copy and paste information in the “Date” and “Adj. Close” columns into the appropriate columns on the worksheet in the workbook I have provided you (see Format below). When you paste, chose the “123” option. The other data columns are not needed]. Sort these data from “oldest to newest”. Ensure that you provide the name of the company and its stock symbol in the appropriate cells at the top of the worksheet. 3. a. Use your 61 prices to find the average realized rate of rate of return (rs) over 60 months for each stock. Do this by computing the realized return for each month then finding the average of all 60 monthly returns. The return for each month is found by using the equation: (Ending Price – Beginning Price) / Beginning Price. b. Translate the average monthly realized return to an annualized realized return by multiplying the number you arrived at in part a. by 12. 4. a. Find the standard deviation () for the 60 monthly realized returns. Use the standard deviation function to do this. b. Translate this number into an annualized standard deviation by multiplying it by the square root of 12 (use the SQRT function). 5. Compute the coefficient of variation for each stock using average annualized realized returns from 3b. and the annualized ’sfrom 4b. above. 6. Establish a portfolio comprised of four of your stoc

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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