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Helium gas is stored at 20*C under a pressure of 5x10^5 Pa in a glass cylinder 50 cm in diameter and 10cm long. The glass walls are 3 mm thick. Overtime the Helium will gradually diffuse out of the cylinder. (The diffusion coefficient of He through oxide glass at 20*C is about 4x10^?4 m2/s and the concentration of He on the inner surface is about 2.2x10^?3kmol/m3).
a) Sketch the concentration profile of helium gas through the thickness of the cylinder walls.
b) What is the initial rate of mass loss through the cylinder? Hint: Remember to include the flux through the top and bottom surfaces.
What is principled negotiation, and what are the four key points upon which it is based. What role does a project retrospective perform? How is it different than a post-project evaluation conducted by the project manager and the project team.
Which one of the following is NOT true of cystic fi brosis
Please discuss the reliability and validity of personality test and what role (s) does factor analysis play in constructing personality tests? In your personal opinion are these test necessary?
Culture of Wal-marts of ten impose western culture on the country in which the business is aunched. Locate an article that contains a similar situation as walmart and summarize the findings
fter completing the Mental Rotation experiment and viewing your data, how would you describe the pattern of your results? Do you think that your results fit the pattern of results from the Shepard experiments?
Pros and Cons of Literature Sources. Describe the pros and cons of different sources of literature including the library, online libraries, academic journals and World Wide Web resources.
Administrative conflict is an awareness of interpersonal incompatibilities among those working together on a task.
With electronic communication- each group member has a greater likelihood of participating, status inequities are enhanced, groups are more likely to be vulnerable to problems such as groupthink, the highest status group members do most of the..
Need help with explaining how the family life cycle may be applied in couples and family counseling. Also, what are some examples of crisis situations in which a counselor might apply his or her understanding of the family life cycle?
Is alcoholism a disease, a lifestyle choice? How can people be helped with this problem? How do you know when you are abusing a drug?
As children grow older, parents tend to spend:
Which of the following statements is true- Corporate communicators earn the lowest salaries in public relations. On average, public relations technicians earn more money than public relations managers.
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