Question: Air stored underground at 500 psia and 200 deg.F is first heated by natural gas combustion to 2,340 deg.F at constant pressure, then expanded in an 89% efficient turbine to atmospheric (14.7 psia) pressure. Part of the work of the turbine is used to compress ambient air at 70 deg.F and 14.7 psia to store it underground with an 85% efficient compressor. The air that is stored underground loses heat to the surroundings. The turbine powers an electric generator that is 93% efficient converting mechanical power to electrical power. Mass flow of air is 100 lb/s.

a. How much heat is added by the combustion of natural gas to the air stored underground that enters the turbine? [Answer: 513.6 Btu/lb]

b. What is the work produced by the turbine? [Answer: 379.7 Btu/lb]

c. What is the work of compression? [Answer: 260.2 Btu/lb]

d. At what temperature does the air exit the compressor? [Answer: 1154 deg.F]

e. Natural gas costs $3 per million Btu (MMBtu) and the electricity that is generated by this storage system is sold at $50/MWh. The system produces electricity from the stored compressed air for 5 hours per day. Calculate the net income from the system from electricity sales. [Answer: $2931 electricity sold, $2773 cost of natural gas, $158 net income from producing electricity 5 h/day.]

In Java

Write a GUI that will let the user sample borders. Include a menu named Borders that offers three options—beveled border, etched border, and line border—as submenus with the following options:

• Beveled-border submenu options: raised or lowered.

• Etched-border submenu options: raised or lowered.

• Line-border submenu options: small, medium, or large. Each of these options should be a submenu with three color options: black, red, and blue. Put the borders around a label containing text that describes the border, such as Raised Border, Lowered Etched Border, and so forth. Fix the highlight and shadow colors for the etched-border options to whatever colors you like, and make the small line border 5 pixels wide, the medium one 10 pixels wide, and the large one 20 pixels wide.

n = 35 yrs

PV = 50,000

PMT = 15,000

I = 8%

FV in 35 years = ?

FV if I is 3% = ?

In your own words, clearly explain the process of electrolysis of water. Include a description of the equipment involved, as well as the resulting chemical reaction(s).

A newly issued bond pays its coupons once annually. Its coupon rate is 8.5%, its maturity is 20 years, and its yield to maturity is 10.5%.

a. Find the holding-period return for a 1-year investment period if the bond is selling at a yield to maturity of 9.5% by the end of the year. (Do not round intermediate calculations. Round your answer to 2 decimal places.)

b. If you sell the bond after one year, what taxes will you owe if the tax rate on interest income is 40% and the tax rate on capital gains income is 30%? The bond is subject to original-issue discount tax treatment. (Do not round intermediate calculations. Round your answers to 2 decimal places.)

c. What is the after-tax holding-period return on the bond? (Do not round intermediate calculations. Round your answer to 2 decimal places.)

d. Find the realized compound yield before taxes for a 2-year holding period, assuming that (1) you sell the bond after two years, (2) the bond yield is 9.5% at the end of the second year, and (3) the coupon can be reinvested for one year at a 3% interest rate. (Do not round intermediate calculations. Round your answer to 2 decimal places.)

e. Use the tax rates in (b) above to compute the after-tax 2-year realized compound yield. Remember to take account of OID tax rules. (Do not round intermediate calculations. Round your answer to 2 decimal places.)

3. The

Explain the impact of the national debt on capital markets and future living standards. What are the consequences of the vastly increased foreign holdings of US debt? What are the consequences if the debt is paid off?

You are 20 years old. You plan to work until you are 80 years old. When you turn 80 you will retire. You expect to live until an age of 95. You have forecasted that you will need $50,000 a year in income for your retirement.Your current salary is $45,000 per year. You expect your salary to grow by 0% per year.You will save 5% of your gross income each year.You will invest your savings in risk free treasury notes that are expected to yield 3% each year.Based on this information you will have accumulated enough wealth to finance your retirement.

True or False?

A 0.180-kg wooden rod is 1.60 m long and pivots at one end. It is held horizontally and then released.

Part A : What is the angular acceleration of the rod after it is released? Express your answer to three significant figures and include appropriate units.

Part B: What is the linear acceleration of a spot on the rod that is 0.560 m from the axis of rotation? Express your answer to three significant figures and include appropriate units.

Part C: At what location along the rod should a die be placed so that the die just begins to separate from the rod as it falls? Express your answer to three significant figures and include appropriate units.

At what radius along the perpendicular bisector of a wire of length 0.29 m carrying 30 nC of charge does the assumption of cylindrical symmetry in applying Gauss's law give you an answer whose error exceeds 5%?

Part A What is the pH of a buffer prepared by adding 0.809 mol of the weak acid HA to 0.608 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66×10−7. Part B What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. (Express answer to 3 decimal places) Part C What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base.

Question1:playground merry-go-round has mass of 75kg and a radius of 3 m. A 25kg child sits on the merry-go-round 2/3's of way out from center.What's the moment of inertia of the merry-go-round/child system?

Question2:On the playground merry-go round in the previous question,one child pushes it CCW with a force of 20 N, while the 25 kg child drags her feet through a hole 2/3 of the way out from the center,causing a CW force of 17 N. What's angular acceleration of the merry-go-round?

The British Department of Transportation studied to see if people avoid driving on Friday the 13th.   They did a traffic count on a Friday and then again on a Friday the 13th at the same two locations ("Friday the 13th," 2013). The data for each location on the two different dates is in table #9.2.6. Estimate the mean difference in traffic count between the 6th and the 13th using a 90% level.
Table #9.2.6: Traffic Count
Dates 6th 13th
1990, July 139246 138548
1990, July 134012 132908
1991, September 137055 136018
1991, September 133732 131843
1991, December 123552 121641
1991, December 121139 118723
1992, March 128293 125532
1992, March 124631 120249
1992, November 124609 122770
1992, November 117584 117263

A marketing research firm wishes to compare the prices charged by two supermarket chains—Miller’s and Albert’s. The research firm, using a standardized one-week shopping plan (grocery list), makes identical purchases at 10 of each chain’s stores. The stores for each chain are randomly selected, and all purchases are made during a single week. It is found that the mean and the standard deviation of the shopping expenses at the 10 Miller’s stores are x1¯¯¯¯?=?$114.14x1¯?=?$114.14 and s₁= 1.12. It is also found that the mean and the standard deviation of the shopping expenses at the 10 Albert’s stores are x2¯¯¯¯?=?$113.14x2¯?=?$113.14 and s₂= 1.67.

(a) Calculate the value of the test statistic. (Do not round intermediate calculations. Round your answer to 2 decimal places.)

Test statistic          

(b) Calculate the critical value. (Round your answer to 2 decimal places.)

Critical value          

(c) At the 0.02 significance level, what it the conclusion?

Suppose two independent random samples of sizes n₁ = 9 and n₂ = 7 that have been taken from two normally distributed populations having variances σ12σ21 and σ22σ22 give sample variances of s₁² = 117 and s₂² = 19.

(a) Test H₀: σ12σ21 = σ22σ22 versus H_a: σ12σ21 ≠≠ σ22σ22 with σσ = .05. What do you conclude? (Round your answers to 2 decimal places.)

(b) Test H₀: σ12σ21< σ22σ22versus H_a: σ12σ21 > σ22σ22 with σσ = .05. What do you conclude? (Round your answers to 2 decimal places.)

In phyton, lab 5 info.

def is_dna(one):
sequence = input().upper()
valid_dna = "ACGT"
sequence = sequence.replace(" ", "")

for i in sequence:
if i in valid_dna:
count = 1
else:
count=0
if count==1:
print("This is a valid DNA sequence.")
else:
print("This is an invalid DNA sequence")

5
def is_valid(dna):
for one in dna:
if not is_dna(one):
return False
return true
print(is_valid("AGCTAGCAAGTCTT")) #prints true
print(is_dna("ACGTTGGC")) #prints false

1. Write a function called 'transcribe' that takes a DNA sequence as an argument. Return the transcribed RNA sequence. For example, if the DNA sequence is: tagtacta Then the transcribed RNA sequence should be: uaguacua Write a program to prompt the user to enter a DNA sequence and validate the sequence using the function you wrote in lab 5 and display the transcribed RNA sequence. 2. Write a function called 'revcom' that takes a DNA sequence as an argument. Return the reverse complement of the DNA sequence. For example, if the DNA sequence is: tagtacta The the reverse complemented DNA sequence is: tagtacta Write a program to prompt the user to enter a DNA sequence and validate the sequence using the function you wrote n lab 5 and display the reverse complemented sequence. 3. Create a list called 'verbs' and populate it with 6 or more of your favourite verbs (work safe!) Print the list of verbs one verb per line using a for loop and again with a while loop.