Explain the following repair mechanisms:

-removal of thymine dimers

-base excision repair

-nucleotide excision repair.

1) An object's original position is 30 meters at an angle of 150 degrees and final position is 30 meters at 70 degrees. The object traveling at constant speed in a circular arc clockwise and makes the journey in 12 seconds.

a) Find the Displacement vector

b) find the total Distance traveled.

c)find the avg Velocity vector, avg Speed, and instantaneous Speed.

d) find the avg Acceleration vector and instantaneous Acceleration vector. Show that the avg Acceleration vector points towards the center when placed at the midpoint of the arc!

(a) Company EEF ltd is considering an investment of €100,000. The desired payback period is 3 years. The board of directors have identified two alternatives; project A and project B.

The expected annual cash flows are as follows:

Cash flow: Project A       Project B

(-)       (-)

Y0 100,000.00 100,000.00

Y1                          35,000.00          35,000.00

Y2                          28,000.00          35,000.00

Y3                      32,000.00          35,000.00

Y4                      40,000.00             35,000.00

Required: Calculate the Payback period of each project and advise EEF’s board of directors which project they should invest in.

A company has two different bonds currently outstanding. Both bonds have a face value of R100. Bond A matures in 10 years. The bond makes no coupon payments for the first four years and then pays R8.50 semi-annually for the subsequent four years, and finally pays R10.50 semi-annually for the last two years. Bond B also matures in 10 years; it makes coupon payments of R4.50 semi-annually over its life. The yield to maturity on both bonds is 12% per annum, compounded semi-annually.

What is the current price of each bond?

Describe some of Lewin's accomplishments regarding the promotion of social change during his lifetime. Explain Lewin's impact on social psychology as a science and on the society.

The initial rates listed in the following table were measured in methanol solution for
the reaction: A + 2 B + C ↔ 2 D + 2 E

Write the rate law for the reaction.

What is the numerical value of k? (don’t forget to include the units)

A company would like to determine the relationship between: the time (in years) spent at the company and the employee’s hourly pay. The data for 5 employees are listed in the table below. Calculate and interpret the correlation coefficient r. Include a plot of the data in your discussion.

a. Calculate the Pearson correlation coefficient for the data.

b. Use an appropriate 2-tailed hypothesis test (ɑ = .05) to determine whether this relationship is statistically significant.

c. Based on your calculations, what can we conclude about the relationship between the time spent at the company and hourly pay?

The 1.3 kg physics book in figure is connected by a string to a 250 g coffee cup. The book is given a push up the slope and released with a speed of 3.5 m/s . The coefficients of friction are μs =0.50 and μk =0.20.

Part A) How far does the book slide?

An 84.0 kg spacewalking astronaut pushes off a 640 kg satellite, exerting a 95.0 N force for the 0.600 s it takes him to straighten his arms.

Part B) How far apart are the astronaut and the satellite after 1.00 min ?

Can you use phenolphthalein to titrate a colored solution? Explain please! I can't figure this out.

What value resistor will discharge a 3.00 μF capacitor to 10.0% of its initial charge in 2.20 ms ?

The specific rate constant for the first-order decomposition of N2O5(g) to NO2(g) and O2(g) is 7.48×10−3s−1 at a given temperature.

Part A:

Find the length of time required for the total pressure in a system containing N2O5 at an initial pressure of 0.110 atm to rise to 0.150 atm . Express your answer using two significant figures.

Part B:

Find the length of time required for the total pressure in a system containing N2O5 at an initial pressure of 0.110 atm to rise to 0.220 atm .Express your answer using two significant figures.

Part C:

Find the total pressure after 120 s of reaction.

(1) Briefly explain the similarities and differences between nitric oxide oxidation and sulfur dioxide oxidation in the troposphere. (10 points possible)

Jordan Company sells lamps and other lighting fixtures. The purchasing department manager prepared the following inventory purchases budget. Jordan’s policy is to maintain an ending inventory balance equal to 15 percent of the following month’s cost of goods sold. April’s budgeted cost of goods sold is $76,000. Complete the inventory purchases budget by filling in the missing amounts.

Complete the inventory purchases budget by filling in the missing amounts.

b. Cost of goods sold

c. Ending inventory

Given

A venture capital company plans to invest in one of two start-up engineering firms. Investments like this are risky by nature, but the company thinks the risk is about the same for both firms. So, the company will pick the firm that would produce the largest rate of return on their investment.

With either start-up firm, the company would invest $2 million in capital (today). The first engineering firm would agree to repay the company with a single lump sum of $8 million after three years. The second engineering firm would agree to repay the company with a series of monthly payments; after a one year period with no payments, the company would receive $150,000 at the end of each month during the second year, and $250,000 at the each of each month during the third year.

Find

1. Draw a cash-flow diagram of the first start-up firm investment.

2. Determine the monthly and annual rate of return (in %) for the first start-up firm investment.

3. Draw a cash-flow diagram of the second start-up firm investment.

4. Determine the monthly and annual rate of return (in %) for the second start-up firm investment.

5. Determine which investment is better for the venture capital company and why.

the product in a Coumarin synthesis lab is soluble in aqueous base. Why?

1.The base deprotonates α- to the carbonyl to form an enolate ion.

2.The base deprotonates α- to the phenol to form a phenylate anion.

3.The base deprotonates the phenol hydroxyl to form a phenoxide anion.

4.The product is water soluble.