Physics Misc Topic Level: University
Magnet A has twice the magnetic field strength of magnet B, and at a certain distance, it pulls on magnet B with a force of 50N. With how much force, then does magnet B pull on magnet A?
Physics Misc Topic Level: University
Rearrange the equation [current = voltage/resistance] to express resistance in terms of current and voltage. Then solve: A certain device in a 120-V circuit has a current rating of 20A. What is the resistance of the device (How many ohms)?
Physics Misc Topic Level: University
Find the voltage change when (a) an electric field does 12 J of work on a 0.0001-C charge, and when (b) the same electric field does 24 J work on a 0.0002-C charge.
Physics Misc Topic Level: University
If 50 grams of hot ware at 80oC is poured into a cavity in a very large block of ice at 0oC, what will be the final temperature of the water in the cavity? How much ice must melt in order to cool the hot water down to this temperature?
Physics Misc Topic Level: University
The heat of vaporization of ethyl alcohol is about 200 cal/g. If 2 kg of it were allowed to vaporize in a refrigerator, how many grams of ice would be formed from 0oC water?
Physics Misc Topic Level: University
The specific heat capacity of ice is about 0.5 cal/g* oC. Supposing that it remains at that value all the way to absolute zero, calculate the number of calories it would take to change a 1-gram ice cube to absolute zero (-273oC) to 1 gram of boiling water. How does this number of calories compare with the number of calories required to change the same gram of 100oC boiling water to 100oC steam?
Physics Misc Topic Level: University
A 10-kg iron ball is dropped onto a pavement from a height of 100 m. If half of the heat generated goes into warming the ball, find the temperature increase of the ball. (In SI units, the specific heat capacity of iron is 450 J/kg*oC.) Why is the answer the same for an iron ball of any mass?
Physics Misc Topic Level: University
Many people mistakenly believe that the astronauts orbiting the earth are above gravity. Calculate the acceleration due to gravity g for space shuttle territory 200 kilometers above the earth s surface. Earth s mass is 6 X 1024kg, and its radius is 6.38 X 106m (6380 km). Your answer is what percentage of 9.8 m/s2?
Economics Misc Topic Level: University
Cigarette Smoking Price Elasticity of DemandAnalyze the Issue
According to the above discussion, what factors influence the price elasticity of demand for cigarettes? What other factors not mentioned in the article might also influence the price elasticity of demand for cigarettes? Use graphs as well if possible.
Is GDP A False Beacon Steering Us Into The Rocks?
Analyze the Issue
Suppose a nuclear power plant disaster occurs. How could GDP be a “false Beacon” in this case? Show graph as well if possible.
Is It a Robot’s World?
Analyze the Issue
1. Are the musicians experiencing frictional, structural, or cyclical unemployment? Explain.
2. What solution would you propose for the trumpet plays mentioned above?
Use graphs as well when possible.
When the Inflation Rate is 116, 000 Percent, Prices Change by the Hour
Analyze the Issue
1. Can you relate inflation psychosis to these excerpts? Give an example of a debtor-lender relationship that is jeopardized by hyperinflation.
2. Explain why the workers in Bolivia were striking even though wages rose at an annual rate of 1500 percent. Do you see any connection between hyperinflation and the political system? Use graphs as well if possible.
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Physics Misc Topic Level: University
A transmission line is made of aluminum wire 1 inch in diameter. What is the resistance of 20 miles of this wire?
Physics Misc Topic Level: University
Explain why a tremendous noise produced on the moon would not be heard on earth.
Physics Misc Topic Level: University
How does the primary voltage of an induction coil differ from the secondary voltage? What is the general purpose of induction coil?
Biology Misc Topic Level: University
Genetics
Four homozygous recessive mutant lines of Drosophila melanogaster (labeled 1 through 4) showed abnormal leg coordination, which made their walking highly erratic. These lines were intercrossed; the phenotypes of the F1 flies are shown in the following grid, in which “+” represents wild-type walking and “-“ represents abnormal walking:
| | 1 | 2 | 3 | 4 |
| 1 | - | + | + | + |
| 2 | + | - | - | + |
| 3 | + | - | - | + |
| 4 | + | + | + | - |
a. What type of test does this analysis represent?
b. How many different genes were mutated in creating these four lines?
c. Invent wild-type and mutant symbols and write out the full genotypes for each of the four mutant lines.
Biology Misc Topic Level: University
A homozygous line of parakeets with blue feathers and banded wings was crossed to a homozygous line of parakeets with green feathers and unbanded wings. The F1 progeny from this cross had green feathers and banded wings. Brother to sister matings were conducted among the F1 animals and the following F2 progeny were recovered:Green feathers and banded wings: 121
Green feathers and unbanded wings: 29
Blue feathers and banded wings: 33
Blue feathers and unbanded wings: 2
Total 185
- a. If the genes that produced these phenotypes were unlinked, what would be the expected numbers of F2 cross progeny in each of the phenotypic classes?
- b. Use a chi-squared test to determine if these genes are linked. The Equation for Chi Squared is in answer attachment, and the Chi Squared table is on the last page of the exam.
- c. State in a single complete sentence: what is your interpretation of this Chi Squared result?
Statistics Misc Topic Level: University
GPA And Pertinent StatisticsA researcher collected this data on the college GPA of 27 people, along with their High School GPA, SAT score and the number of letters of recommendation they had for their college application. Is there a significant relationship between these variables and college GPA? Which has the highest absolute impact? If there is a significant relationship, which variables contribute significantly? What is the GPA of someone who had zeros for all of the variables? Include hypotheses for any tests performed, as well as pertinent statistics.
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