8. You are tasked with trying to restore the biodiversity in a national park. How might your understanding of keystone species affect your management plans?

9. Earth can support more people who are vegetarians than people who regularly consume meat. Why do you think this is?

10. If only 10% of the energy available in a plant is turned into body tissue of a cow, what happens to the other 90%?

11. Which do you think would be a more stable ecosystem: one where each species has only one connection to another species, or one where each species has five connections to other species? Explain your answer.

12. Which community would support the greatest diversity of species—a community composed of species with broad ecological niches or a community composed of species with narrow, specialized ecological niches? Explain your answer.

Assume the economy has a GDP of $11,500 billion. The unemployment rate is at 7.3% and has been slowly rising for the last 6 months. Inflation was at 2.3% one year ago but has since dropped to near 0%. The MPC in the economy is .80 and the Natural Rate of Unemployment is 4.5%. The target rate for inflation is 2%.

1. Why would it be better for government to solve the problem using government purchases (part c above) rather than taxes (part d above) to solve the problem?
2. Assuming that government does decide to use the tax policy, what could happen to cause the policy to be ineffective?

Trace metals found in wells affect the taste of drinking water, and high concentrations can pose a health risk. Researchers measured the concentration of zinc (in milligrams/liter) near the top and the bottom of 7 randomly selected wells in a large region. The data are provided in the following table. Construct and interpret a 90% confidence interval for the true mean difference (Bottom – Top) in the zinc concentrations of the wells in this region.

A. The electric potential at a position located a distance of 19.2 mm from a positive point charge of 7.80×10^-9C and 13.0 mm from a second point charge is 1.14 kV. Calculate the value of the second charge.

B. The potential difference between two parallel conducting plates in vacuum is 590 V. An alpha particle with mass of 6.50×10^-27 kg and charge of 3.20×10^-19 C is released from rest near the positive plate. What is the kinetic energy of the alpha particle when it reaches the other plate? The distance between the plates is 45.0 cm.

Closing is subject to buyer’s inspection of property by him and his designated specialist and complete satisfaction of specialist with property condition. Aherns’s specialist inspected the property and said he thought the roof would need to be replaced in a few years. He also felt some wood near the front of the cabin should be replaced. Aherns demanded that the Johnsons fix these items or he would not close. The Johnsons maintain they did not agree to any repairs; the condition was for Aherns’ protection so that he could opt out of the agreement. Aherns has threatened to sue for breach of contract. Who should win?

Determine the chimney height required to preserve design flow in a natural recirculation boiling water reactor channel with the following characteristics:

System pressure: 7.136 MPa

Reactor height 1.83 m

Feedwater temperature 260 Celsius

Combined pressure in losses in the channel, chimney, and downcomer: 1344.5 Pa

Average channel density in the core: 642.9 kg / m^3

Two-phase friction losses in the chimney 137.9 Pa

Friction losses in the downcomer: 68.9 Pa

Friction drop in channel: 606.7 Pa

Average exit void fraction: 44%

Feedwater added near the top of chimney

1) Describe what polarization means in the context of electric charges. Generally, under what circumstances would I see polarization happen? (describe how the charges are distributed pre- and post- polarization). Water is said to be a polar molecule; what does that mean in this context?

2) Plasma is a state of matter that has been completely ionized; meaning that there are no electrons bound to protons, and both the electrons and protons are able to move about freely. If I have a positively charged surface and bring it near to a plasma, what would happen? Will both the electrons and protons behave in the same way? (compare their accelerations).

3. A pregnant woman has come to you for advice. By mistake she took thalidomide prescribed for her husband. She is certain that she took the drug during the third week of pregnancy, she is now near the end of the second trimester. She has come to you to determine whether her child will be born with malformed limbs.

a. Explain what test or tests you would suggest that could answer her question.

b. Explain why you choose that test.

c. What results would you expect from your test if the fetus was affected.

PLEASE BE SPECIFIC

Once researchers learn about some aspect of cancer or its treatment, clinical trials are needed to test out any proposed use in humans. What are some of the kinds of clinical trials going on for cancer? Go to the National Cancer Institute's website and look at their web page with the title Search for Clinical Trials. Select a form of cancer and look for clinical trials near you. Pick one of the trials that is currently open to new participants. Explain who is participating and what is the trial testing, Who is excluded from participation? What phase of trial is this study and what are they mainly trying to find out?

Two objects, A and B, are released from rest in free space (no other masses are near). Object A has a greater mass than object B. They accelerate toward each other under the action of their mutual gravitational attraction.

a. On which object is the greater work done?

b. At the instant just before they hit, which object will have the momentum with the greatest magnitude?

c. At the instant just before they hit, which object will have the greater kinetic energy? Explain.

in all of the above could you explain how you got to the answer.

Thank you so much!