Calculate the pH of a buffer solution prepared by dissolving 4.2 g of NaHCO3 and 5.3 g of Na2CO3 in 0.20 L of water. Will the pH change if the solution volume is increased by a factor of 10?

Assume you are considering a portfolio containing two assets, L and M. Asset L will represent 39% of the dollar value of the portfolio, and asset M will account for the other 61%. The projected returns over the next six years, 2018–2023, for each of these assets are summarized in the following table. *huge thumbs up for correct answers*

Projected Return (%)

(Year)  (Asset L)  (Asset M)

(2018) (14%)  (21%)

(2019) (13%)  (19%)

(2020)  (15%)  (16%)

(2021)  (17%) (15%)

(2022)  (18%)  (11%)

(2023)  (20%)  (10%)

a.Use an Excel spreadsheet to calculate the projected portfolio return, rp, for each of the six years.

b. The average expected portfolio​ return, rp, over the 6-year period is (blank) %

c. The standard deviation of expected portfolio returns over the 6-year period is (blank) %

d. How would you characterize the correlation of returns of the two assets L and​ M? (neg. pos. or un-correlated)

e. Discuss any benefits of diversification achieved through creation of the portfolio.  

​ A. By combining these two negatively correlated​ assets, the overall portfolio risk is increased.

B. By combining these two positively correlated​ assets, the overall portfolio risk is reduced.

C. By combining these two negatively correlated​ assets, the overall portfolio risk is reduced.

D.By combining these two negatively correlated​ assets, the overall portfolio risk is eliminated.

Consider an object with a mass of 3.5 kg located at R1 = (0.0 m, 2.5 m), another object with a mass of 3.5 kg located at R2 = (1.5 m, 1.5 m), and a third object with a mass of 8.5 kg located at R3 = (– 2.5 m, 2.5 m), and a fourth object with a mass of 5.0 kg located at R4 = (2.5 m, 0.0 m). Calculate the center of mass of this group of four objects. Give your answer in the form Rcm = (xcm, ycm) and with 2 significant figures.

Block 1, with mass m₁ and speed 3.5 m/s, slides along an x axis on a frictionless floor and then undergoes a one-dimensional elastic collision with stationary block 2, with mass m₂ = 0.67m₁. The two blocks then slide into a region where the coefficient of kinetic friction is 0.57; there they stop. How far into that region do (a) block 1 and (b)block 2 slide?

Deriving cash flows for asset disposition. Custom Machining Company (CMC) purchased a made-to-order machine tool for grinding machine parts. The machine costs $160,000, and CMC installed it yesterday. Today, a vendor offers a machine tool that will do exactly the same work but costs only $80,000. Assume that the cost of capital is 12 percent, that both machines will last five years, that CMC will depreciate both machines on a straight-line basis for tax purposes with no salvage value, that the income tax rate is and will continue to be 40 percent, and that CMC earns sufficient income that it can offset any loss from disposing of or depreciating the ‘‘old’’ machine against other taxable income. How much, at a minimum, must the ‘‘old’’ machine fetch upon resale at this time to make purchasing the new machine worthwhile?

I have asked the question before, but I do not understand how depreciation * tax rate (for example $16,000* .4 = $64,000, instead of $4,000 or $32,000* .4= $128,000, instead of $8,000?).

A steam pipe is covered with 1.50-cm thick insulating material of thermal conductivity of 0.200 cal/cm · °C · s. How much energy is lost every second when the steam is at 240°C and the surrounding air is at 20.0°C? The pipe has a circumference of 800 cm and a length of 50.0 m. Neglect losses through the ends of the pipe.

Suppose a bridge has 10 toll booths in the east-bound lane: four are only for E-Z Pass holders, two are only for exact change, one takes only tokens, and the remainder are manned by toll collectors who accept only cash. During heavy-traffic hours it is difficult to see the signs indicating the type of toll booth. Suppose a driver selects a toll booth randomly.

• a. What is the probability that an exact-change toll booth is selected?

• b. What is the probability that a manual-collection toll booth or the token toll booth is selected?

• c. What is the probability that an E-Z Pass toll booth is not selected?

• d. Suppose the driver has only tokens. What is the probability of selecting the appropriate toll booth?

Illustrate with a diagram how basic TCP Windowing works.

A proton and an alpha particle (q=+2e,m=4u) are fired directly toward each other from far away, each with an initial speed

of 0.014 c .

Part A

What is their distance of closest approach, as measured between their centers?

Express your answer to two significant figures and include the appropriate units

How can discuss the subject (the nearly free electron approximation)? and tight-binding approximation?

Suppose that the average U.S. household uses 13600 kWh (kilowatt-hours) of energy in a year. If the average rate of energy consumed by the house was instead diverted to lift a 2350 kg car 11.3 m into the air, how long would it take?

Using the same rate of energy consumption, how long would it take to lift a loaded 747, with a mass of 4.10 × 105 kg, to a cruising altitude of 9.67 km?

A 19.0-kg child on a 4.00-m-long swing is released from rest when the ropes of the swing make an angle of 35.0° with the vertical.

(a) Neglecting friction, find the child's speed at the lowest position.
m/s

(b) If the actual speed of the child at the lowest position is 3.30 m/s, what is the mechanical energy lost due to friction?
J

note: Input-output screen-shot if needed #No-copy paste codes, please.

Q) Create a python functions that rotates the elements of a list by one position. Consider a function rotate(a_list, direction) that takes as arguments the list to rotate, and the direction (left or right) of rotation. Rotate the list in place.

Q) Choice of appropriate data structure is an important step in designing algorithms. Suppose a text file contains student records on each line and each record is of the format: Name of Student, Student ID, GPA. Now consider reading that le to create a list of lists, a list of tuples or a tuple of tuples.
(a) If you want to create a report using the data, what data structure would you use?

(b) If you want to modify the name, id or GPA, what data structure would you use?