Pulp containing paraffin wax is to be dewaxed in a continuous countercurrent extraction system using kerosene. The pulp containing the wax is kerosene-free when entering the extractor, and contains 20% paraffin wax and 80% pulp. After extraction, it must not contain over 0.2 lb wax / 100 lb wax-free pulp. The kerosene used for the extraction contains 0.05 lb of wax per 100 lb kerosene. Experiments show that the pulp retains 2.0 lb of kerosene per lb of kerosene- and wax-free pulp as it is transferred from cell to cell. The extract from the extraction battery is to contain 5 lb wax per 100 lb of kerosene. How many stages are required?

A refrigerator is running with tetrafluoroethane (R1-34a) as the fluid and working based on the following cycle.

Saturated vapor at -12^oC is entering the compressor and leaving it at 40^oC. The superheated vapor after the compressor then condensed at constant pressure to saturated liquid, which ethers the “Joule-Thompson” throttling valve and back to the initial pressure. Assume your system is operating ideally, with a cooling load of 0.2 kW (200 J/s).

(a) Draw the cycle on the P-H diagram and showing each of the steps.

(b) Develop the energy balance for each step, and calculate heat and mechanical power per kg of fluid for each step.

(c)What is the flow rate of cooling fluid needed?

(d) What is the coefficient of performance (COP) of the refrigerator?

For this question ask for the expected return -beta relationship .

Must I repeat the E(R) formula for Beta F1 & F2 and then compare the answers?

pg. 139 of Investments 11th edition thanks!

There's the question:

4. Suppose the there are two independent economic factors F1 and F2. The risk free rate is 6% and all the stocks have independent firm specific components with a standard deviation of 45%. Portfolios A and B are both well diversified with the properties:

Portfolio

A 1.5 (Beta F1) 2.0 (Beta F2) 31% (Expected Return)

B 2.2 (Beta F1)  -0.2 (Beta F2) 27% (Expected Return)

What is the expected return beta-relationship in this economy?

thanks again.

A producer of a variety of salty snacks would like to estimate the average weight of a bag of BBQ potato chips produced during the filling process at one of its plants. Determine the sample size needed to construct a 99​% confidence interval with a margin of error equal to 0.007 ounces. Assume the standard deviation for the potato chip filling process is 0.05 ounces.

The sample size needed is______________​(Round up to the nearest​ integer.)

_____________________________________________________________________________________________________________________________________

Determine the sample size needed to construct a 95%confidence interval to estimate the average GPA for the student population at a college with a margin of error equal to 0.2. Assume the standard deviation of the GPA for the student population is 2.5.

The sample size needed is________________​(Round up to the nearest​ integer.)

1. Given a vector, a, of length n, write down the MATLAB expressions that will correctly compute the following:

a.        ln (3 + a + a² )

b.         e^a (1 + cos(3a))

c.         cos² (a) + sin² (a)

d.         tan^-1 (a)

Test that your solution works for a = 1:0.2:2

2. a. Create a vector of odd whole numbers between 10 and 40.

      b. Create a vector of even whole numbers between 25 and 35.

3. Plot a Straight line with slope m=0.5 c=-2 at the following coordinates X=0, 4,5,7,9,10,12,15.

4.   Plot y=sin x, 0<=x<=4pi, taking 50,100 linearly spaced points in the given interval.

A couple was at a ski lodge and went to happy hour from 5pm to 9pm. The bar stops serving at 10pm. They leave the ski resort on a snowy night and are driving back to the hotel which is about an hour’s drive from the resort. At 12 am a passerby sees a car off the road in the trees. He finds the male unconscious and injured behind the wheel. The female is deceased. The passerby calls 911 and it takes an hour for them to come. The male arrives at the hospital at 2 am and his blood is drawn at 2:30 am. The male is found to have a BAC of 100mg/dl in plasma.

Male weighs 70 kg

Calculate if he is going to jail or not and why?

How many drinks did he consume?

Minimum # of drinks to achieve BAC?

Clue: the key thing to realize is the happy hour ended at 9 pm and the bar closed at 10 pm. therefore, what assumptions can be made about whether he was absorptive or post-absorptive?

1) A 7% Commonwealth government bond has three years to maturity. Given that the bond pays coupons semi-annually (i.e. twice a year) and a coupon payment has just been made, what is the present value (price) of the bond if the market interest rate is 9% and the face value of the bond is $100,000?

2) You have observed the returns for an investment in Telstra shares for the last five years. This shows returns of 23%, -17%, 8%, 22% and 3%. Calculate the average return, variance, and standard deviation of these shares.

3) You own a portfolio that is invested as follows: $11,600 in shares of Rendezvous hotel, $7,800 in shares of Crown Plaza, $14,900 in shares of Carlton & United Breweries, and $3,200 in shares of Domino’s Pizza . What is the portfolio weight of shares of Carlton & United Breweries?

4) One year ago, you bought a share for $36.48. You received a dividend of $1.62 per share last month and sold the share today for $40.18. What is the capital gains yield on this investment?

At a facility’s loading dock, delivery vehicles arrive randomly, starting at 8:00 AM, at a rate of 2.0 per hour. If the dock is occupied by another vehicle, the driver must park in a waiting area until the dock is clear; this occurs with probability 0.20, independent of the time of day or other variables. Identify the family and parameter(s) of each of the following random variables (for instance, “Bernoulli(0.5)”). If it is not one of our “famous” families indicate “other”; if the parameters cannot be determined indicate so.

(a) The time elapsed before the next vehicle arrives.

(b) The number of arrivals between 8:00 AM and 10:00 AM.

(c) The number of vehicles in the loading dock.

(d) Of the next 10 deliveries to arrive, the number than have to wait for the dock to clear.

(e) The number of vehicles in the waiting area.

(f) The number of deliveries made up to and including the first that has to wait for the dock to clear.

(g) The arrival time of the third delivery on a given day

Each statement describes one of the major market models or industry structures (pure competition, pure monopoly, oligopoly, or monopolistic competition) . Provide the market model or industry structure each description best fits

1. Individual firm in this market model faces a perfectly elastic demand curve.

2. Industry model where excess capacity is most likely to be found.

3. Industry structure in which one firm produces a product for which there are no good substitutes.

4. The Vegas hotel casino industry would be found in the industry or market model.

5. A pharmaceutical company would be classified in this group:

6. Market structure in which a local pizza or sandwich shop would be classified.

7. The beer industry would be classified in this industry structure.

8. The airline industry is found in this industry or market structure.

9. Industry structure in which both productive and allocative efficiency is attained in the the long run.

10.  Market structure marked by mutual interdependence among firms.

For each of the following scenarios, develop a testable hypothesis.
a. Scenario 1. Kelly and Jack are playing in the park. Jack rolls a marble
down the small playground slide. Kelly proposes the idea that the marble
would travel at a faster pace if it is rolled down the longer slide.
b. Scenario 2. Andy’s nightly chores include washing the family dishes. His
mother tends to cook everything that she prepares a bit too long. Because
of this, Andy spends a lot of swear, effort, and time washing the dishes.
He sees a commercial on televisions that claims that brand X dishwashing
detergent cuts through grease better than its competitor brand Y.
c. Scenario 3. Ali’s favorite food is microwave popcorn. She lives microwave
popcorn so much that she can’t stand to waste the un-popped kernels in
the bottom of the bag. The next time Ali goes to the grocery store she
buys all the brands of microwave popcorn that the store has.