Consider atmospheric air at a velocity of V = 20 m/s and a temperature of T= 20C, in cross flow over 10 mm square tube at 45 degrees, maintained at 50C.
In: Mechanical Engineering
a)Assume the reaction 2Fe3+ + Sn2+ -> 2Fe2+ + Sn4+ has a rate law v = k[Fe3+][Sn2+]. If Fe2+ is produced at a rate of 0.12 mol L-1 s-1 when the reactant concentrations are 0.30 mol L-1 for Fe3+, and 0.40 mol L-1 for Sn2+, then what is the value of the rate constant, k ? Quote your answer to 2 decimal places.
Answer L.mol-1.s-1
b)
The half-life for the decomposition of a gaseous sample of thioketene, H2C=C=S at 500 Pa is 42 s. When the thioketene pressure is 250 Pa the half-life is 21 s. Determine the order of the reaction, entering your answer as a number.
c)
At 1100 K, acetic acid decomposes via 2 competing, first order reactions:
CH3COOH -> CH4 + CO2, k1 = 3.4 s-1
CH3COOH -> CH2=C=O + H2O, k2 = ? s-1
The half life of acetic acid at this temperature is 0.10 s. What is the value of the rate constant, k2?
d)
At 1100 K, acetic acid decomposes via 2 competing, first order reactions:
CH3COOH -> CH4 + CO2, k1 = 4.1 s-1
CH3COOH -> CH2=C=O + H2O, k2 = ? s-1
At 1100K, the yield of ketene (CH2=C=O) is 71.5%. Estimate the rate constant, k2, for the second reaction
e)
The following mechanism has been proposed for recombination of iodine atoms:
I + I -> I2*, k1 = [k1].0
I2* -> I + I, k-1 = [k-1].0
I2* + M -> I2, k2 = [k2]
What is overall rate constant if k1 = 4, k-1 = 4 and k2 = 0.04?
f)
The following mechanism has been proposed for recombination of iodine atoms:
I + I -> I2*, k1 = 9.0
I2* -> I + I, k-1 = 5.0
I2* + M -> I2, k2 = 0.04
What is overall rate constant?
.
In: Chemistry
Use Table V in Appendix A to determine the t-percentile that is required to construct each of the following two-sided confidence intervals. Round the answers to 3 decimal places.
(a) Confidence level = 95%, degrees of freedom = 19
(b) Confidence level = 95%, degrees of freedom = 30
(c) Confidence level = 99%, degrees of freedom = 17
(d) Confidence level = 99.9%, degrees of freedom = 14
In: Math
Let V be the vector space of all functions f : R → R. Consider the subspace W spanned by {sin(x), cos(x), e^x , e^−x}. The function T : W → W given by taking the derivative is a linear transformation
a) B = {sin(x), cos(x), e^x , e^−x} is a basis for W. Find the matrix for T relative to B.
b)Find all the eigenvalues of the matrix you found in the previous part and describe their eigenvectors. (One of the factors of the characteristic polynomial will be λ 2+1. Just ignore this since it has imaginary roots)
d) Use your answer to the previous part to find all the eigenvalues of T and describe their eigenvectors. Check that the functions you found are indeed eigenvectors of T.
In: Advanced Math
v
Question #1: Suppose that you are the economic advisor to a local government that has to deal with a politically embarrassing surplus that was caused by a price floor that the government recently imposed. Your first suggestion is to get rid of the price floor, but the politicians don’t want to do that. Instead, they present you with the following list of options that they hope will get rid of the surplus while keeping the price floor. Identify each one as either could work or can’t work.
In: Economics
A fireworks rocket is moving at a speed of v = 45.7 m/s. The rocket suddenly breaks into two pieces of equal mass, which fly off with velocities v1 at an angle of theta1 = 30.7° and v2 at an angle of theta2 = 59.3° as shown in the drawing below.
In: Physics
A potential difference of 5.00 V will be applied to a 47.00 m length of 18-gauge tungsten wire (diameter = 0.0400 in). Calculate the current.
Calculate the magnitude of the current density.
Calculate the magnitude of the electric field within the wire.
Calculate the rate at which thermal energy will appear in the wire.
Tungsten: 5.28e-8
In: Physics
V
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The technique for calculating a bid price can be extended to many other types of problems. Answer the following questions using the same technique as setting a bid price; that is, set the project NPV to zero and solve for the variable in question. Guthrie Enterprises needs someone to supply it with 159,000 cartons of machine screws per year to support its manufacturing needs over the next five years, and you’ve decided to bid on the contract. It will cost $1,990,000 to install the equipment necessary to start production; you’ll depreciate this cost straight-line to zero over the project’s life. You estimate that in five years this equipment can be salvaged for $169,000. Your fixed production costs will be $284,000 per year, and your variable production costs should be $11.30 per carton. You also need an initial investment in net working capital of $149,000. The tax rate is 24 percent and you require a return of 13 percent on your investment. Assume that the price per carton is $17.90. |
| a. |
Calculate the project NPV. (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) |
| b. |
What is the minimum number of cartons per year that can be supplied and still break even? (Do not round intermediate calculations and round your answer to the nearest whole number, e.g., 32.) |
| c. |
What is the highest fixed costs that could be incurred and still break even? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16. |
In: Finance
U.S. v. Tillem.
The case is about of employees of the New York City Department of Health who inspect Manhattan restaurants to determine whether they comply with the City Health Code. The appellants are among 46 individuals arrested after a lengthy investigation into a scheme of corruption that took place in the New York City Department of Health (City Health Department or Department).
Gather information from multiple sources and provide a brief background or summary of the facts. Cite any paraphrasing and quotes from sources.Discuss both sides of the issue before reaching a conclusion, and justify your conclusion and how you arrived at that opinion.
In: Operations Management
A bullet (m = 10 g) flies horizontally with an initial speed of v = 500 m/s and then embeds itself in a block of wood (m = 400 g) that is at rest on a flat surface. The surface has a coefficient of kinetic friction μk = 0.4. After the impact, how far does the block of wood slide?
(a) 40 m (b) 800 m (c) 8 m (d) 80 m (e) 20 m
In: Physics