(i) Show that the skin depth for Cu at 5×1015 Hz (middle of the visible light band) is
approximately 1 nm, compared to 10 mm at 50 Hz (AC mains frequency). (4 marks)
(ii) Show that for Cu the limit s e? ? corresponds to 18 f 010 Hz , meaning that this
approximation applies at frequencies up to at least the ultraviolet. (3 marks)
(iii) Show that for Cu at 1.0 MHz the ratio of the wavelength inside to that outside the
conductor (air or vacuum) is 1.41×10–6
. (2 marks)
(iv) Calculate the skin depth for steel at 50 Hz. (2 marks)
(v) If you want to prevent 50-Hz electromagnetic radiation from affecting a sensitive
electronic instrument, is it better to make the case of copper or steel? Explain your answer. (4
marks)
(vi) Mirrors are generally made by coating silver onto glass. Would coating iron onto glass
also make a good mirror? Explain your answer. (3 marks)

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23) Use Figure 21.2. When the price decreases from $10 to $2, total revenue…$10— ? icn Demand Quantity A) decreases from areas A + B to areas B + C and demand is inelastic. 5 B) decreases from areas A + B to areas B + C and demand is inelastic. C) increases from areas C + D to areas B + A and demand is elastic. D) increases from areas B + C to areas A + B and demand is inelastic. Explain why

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26. What taxes do the employee andthe employee both pay?

The following information is takenfrom the financial statement of Fellow’s Funeral Home:

Total current assets $62,000

Quick assets $40,000

Property, plant, equipment $17,000

Current liabilities $18,000

Long-term liabilities $14,000

Beginning A/R $8000

End A/R $5000

Owner equity $45,000

Beginning Inventory $30,000

Ending inventory $15,000

Cost of Goods Sold $45,000

Net Sales $68,000

Net income $84,000

27. What is the inventory turnoverfor Fellow’s FH?

28. What is the acid-test ratio forFellow’s FH?

29. What is the A/R turnover forFellow’s FH?

30. If you take a loan out for $4000 and you are going to pay it back over 2years at 5% interest, how much money total are you going to pay back?

 

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Go to the Internet and find a web site that will allow you to perform specific task (e.g., make a hotel reservation, order eye glasses, etc.). Develop a user documentation that will include enough information for the end-user to use the system, even if the end-user has never used the system before

 

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3. A new large scale senior community isbeing developed, and one of the decisions to be made is where to locate the twofire stations that have been allocated to the community. For planning purposes, the community has beendivided into five tracts, with no more than one fire station to be located inany given tract. Each station is torespond to all of the fires that occur in the tract in which it is located aswell as in the other tracts that are assigned to this station. The followingtable gives the average response time (in minutes) to a fire in each tract (thecolumns) if that tract is served by a station in a given tract (the rows). The bottom row gives the forecasted average number of fires that willoccur in each of the tracts each year. Formulate this problem situation as an integer programming model.

 

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