a) What is the pH of a buffer made by adding 2.91*10^(-2) NaHCO3 and 4.30*10^(-3) M Na2CO3 t owater in a closed system?

b) What is the pH of the buffer after addition of 10^(-3) M H2SO4? The system is still closed.

c) If the bfufer in part a is opened to an atmosphere with Pco2-10^(-3.46) atm, what is the resulting pH? Does Ctco3 increase or decrease, by how much?

4) A piano tuner hits a key on a piano and strikes a 320 Hz tuning fork. a) The tuner hears a beat frequency of 5 Hz. What could the piano frequency be? Explain. b) The tuner then tightens the piano string which increases its frequency. When he does, the beat frequency increases. What is the original piano frequency? Explain. 5) In a 0.5 m tube, a standing sound wave is created at 857.5 Hz. The speed of sound is 343 m/s. a) Draw a picture of the wave in the tube. b) Which harmonic is the sound? c) Are the ends of the tube open or closed? A) Both ends are open B) Both ends are closed C) 1 end is open, the other is closed d) What is the fundamental frequency of the tube?

For questions below consider the following specific factors model. Vietnam and Thailand produce beans and trucks. Labor is the mobile factor (i.e. labor is used in the production of both goods). The specific factor for beans is land, and the specific factor for trucks is capital. Under the closed-economy equilibrium the relative price of beans with respect to trucks is lower in Thailand than in Vietnam (i.e. under closed economy PbeansThailand/PtrucksThailand < PbeansVietnam/PtrucksVietnam).

For questions (10)~(11) below, assume that as Vietnam goes from closed economy to free trade, the price of trucks remains unchanged, and the price of beans decreases by 10%.

(10). The nominal wage decreases by more than 10% in Vietnam. True or False?

(11). The rental rate of capital increases in Vietnam. True or False?

Example 6:

Technology Tools

is evaluating the purchase of a new type of technology that would cost $1.5 million to

purchase, ship, and install. Still, investment in this machine is expected to increase sales revenues by $400,000, and

reduce operating expenses before depreciation and taxes by $125,000 per year. To operate this machine properly,

workers would have to go through a brief training session that would cost $14,000 on an after tax basis. Also, because

this machine is extremely efficient, its purchase would necessitate an increase in inventories of $80,000, which will be

partially offset by a $25,000 increase in accounts payable. This machine has an expected life of 10 years, after which

the after tax market (salvage) value of the machine will just equal the cost to remove and sell the equipment. Assume

simplified straight-line depreciation and that this machine is being depreciated down to zero. The firm has a 40%

marginal tax rate, and a cost of capital for this very risk project is 22.0% for this type of investment.

a.

What is the initial cost associated with this project?

b.

What are the annual after-tax cash flows associated with this project, for years 1 through 9?

c.

What is the terminal cash flow in Year 10 (i.e., what is the annual after-tax cash flow in Year 10 plus any

additional cash flows associated with termination of the project)?

In the Skilling v. United States 130 S. Ct. 2896 (2010), what did the court hold regarding "honest services"?

Detail the 6-10point to answer?
What are the key factors that have influenced the movement of the ringgit against the US dollar since 2010?

What is the impact of the financial crisis 2008-2010 on McDonald’s in micro and macro level? what are the decisions taken after the recession was ended?

Develop a 6 pages paper based on "Sensation and Perception" Chapter 6 of the textbook "Psychology 9th edition 2010 by D.G. Myers".