Susan is cleaning her house and dust particles are released into the air while she dusts. If two 7.0×10-14C pieces of dust exert an electrostatic force of 5.0×10-12N on each other, how far apart are the dust particles at that time?

A6-m-long 2-kW electrical resistance wire is made of 0.2-cm-diameter stainless steel (k 15.1 W/m · °C). The resistance wire operates in an environment at 30°C with a heat transfer coefficient of 140 W/m2 · °C at the outer surface. Determine the surface temperature of the wire (a) by using the applicable relation and (b) by setting up the proper differential equation and solving??

my question what is the boundry conditions to be used 

Influenza viruses A and B contain eight RNA strands and influenza virus C has seven strands. During antigenic drift, genes coding for glycoproteins recognized by the host immune system are mutated, whereas during antigenic shift, whole RNA strands can be swapped with those of another influenza virus, greatly increasing the virulence and transmissibility of the virus and minimizing the ability of the host’s defenses to recognize it. Which of the following statements is true?

A. If a novel strain resulting from antigenic shift appears, it is not necessary to get vaccinated because these strains are typically less pathogenic than seasonal strains.

B. The worst influenza pandemics throughout history have occurred as a result of genetic drift rather than genetic shift.

C. Genetic drift creates a need for an annual flu vaccine to keep up with the seasonal genetic changes, and if a genetic shift occurs, the same vaccine will be effective against both strains.

D. Genetic drift creates a need for an annual flu vaccine to keep up with the seasonal genetic changes, and if genetic shift occurs, an additional vaccine will have to be administered since the shift creates a different strain of virus.

1. During a recession the store manager for a large electronic goods retailer (wynet) wants to increase sales volumes of both flat screen TVs and DVD players to help that department reach its sales goal; however, a recent market research department analysis showed that demand for flat screen TVs was price sensitive but demand for DVD players was not. how could the manager achieve the sales goals for these two products and how would that strategy be affected by its timing and thus what else would he/she need to do to achieve the sales goal?
2. Oil prices increased by 90% during the first half of 2008 just when the U.S. recession was talking hold- in other words the economy was on a decline. How did this affect the market for air travel? (NOTE: on a separate sheet of paper work out the answer using graphs and then summarize in words what happened)
3.  Suppose that production of wheat is a perfectly competitive market/industry. Given the following information currently for the wheat market: 

Hello, I am struggling with the chemistry discussion question and would like an answer for it.

Thank you.

Objectives:

Demonstrate how to convert the number of atoms into mass or moles.

Explain how the mole ratio is derived from the chemical equation and its fundamental importance in solving for amounts in chemical reactions.

Demonstrate the use of the mole ratio in problem solving through dimensional analysis.

This discussion board is designed to accompany the materials in Chapter 4 which discusses molarity and solute concentrations.

Background:

Professionals in a scientific laboratory and in the healthcare field need to accurately prepare solutions for a number of reasons. If you wear contacts, you probably use a saline solution to rinse your contacts.

What solutions do you use at work? How would you calculate the amount of solute to the solvent to make the solution?

If you do not wear contacts but you use or make cleaning solutions for your housework, how would you accurately prepare solutions to clean?

What solutions do you use that use percent concentration?

Assignment:

Use the materials in your textbook or from online sources to learn/review molarity. Remember to cite your sources.

Respond to at least two other students.

Contribute to an ongoing discussion by responding to comments made to your posting or to comments made by other students to other postings.