Theoretical Centripetal Force= (mv^2)/r (This is in the manual)

Experimental Centripetal Force= |Max-Min|/2 (since the Min is negative, the two minus signs would become a plus)

1. Calculate the theoretical value for the centripetal force for the brass mass using the formula ?(v^2/r). (5 points)

2. Find the experimental value of the centripetal force for the brass mass. The amplitude of any simple sine wave can be calculated by dividing the difference between the maximum and minimum by 2. (5 points)

3. Find the % error for the centripetal force of the brass mass. (5 points)

4. Calculate the theoretical value for the centripetal force for the aluminum mass using the formula ?(v^2/r). (5 points)

5. Find the experimental value of the centripetal force for the aluminum mass. The amplitude of any simple sine wave can be calculated by dividing the difference between the maximum and minimum by 2. (5 points)

6. Find the % error for the centripetal force of the aluminum mass. (5points)

7. In regards to the force sensor in this experiment, what general direction does the centripetal acceleration vector point? (10 points)

8. Using only the equation for centripetal force, show by what factor the force would change if the velocity of the bob was reduced by half, and briefly explain the results. (10 points)

9. For a mass moving in a vertical circle, draw the free body diagram for when the mass is at the highest point of its path, and then write the force summation equation for that free body diagram. (10 points)

10. Why is the force sensor zeroed when the mass is freely hanging from the hook? (5 points)

11. Centripetal force is not a fundamental force of nature. Explain what is meant by this. (5 points)

12. Do the results of the experiment confirm the theory? Explain your answer. (5 points)

13. What are possible reasons for the differences between the experimental and theoretical values of centripetal force? (5 points)

Nancy Dove, age 30, has had episodes of diarrhea and cramping abdominal pain for 8 months. Recently she developed bloody stools, fatigue, and weight loss. Her mother had ulcerative colitis. On physical exam, you find normal vital signs and her cardiac and neurological assessments are normal as well. Her bowel sounds are normal, her abdomen is flat and she has diffuse tenderness to the abdomen but no rebound tenderness. You review her labs. She is positive for occult blood (there is blood in her stool). Her CBC shows anemia. Her stool sample is negative for C. Diff toxin but she does have positive WBCs in the stool. She has just returned from having a colonoscopy and the report indicates she has inflammation and multiple small bleeding ulcers throughout the rectum and sigmoid colon, the biopsy results read: Ulcerative Colitis. Her working diagnoses are now Mild Anemia and Ulcerative Colitis.

1. Inflammatory bowel disease involve genetic predispositions and abnormal ____ cell reactions to intestinal ____________.
   1. B, microflora
   2. T, microflora
   3. B, nutrients
   4. T, nutrients
2. Why did the physician test for rebound tenderness?
3. Why is it important to monitor Ms. Dove’s red blood cell count?
4. What patient education would you provide to Ms. Dove about her diagnosis of UC and anemia?
5. What complications can occur with UC and how can Ms. Dove try to avoid these complications?

In the Bethlehem study, found in the lecture, the author used Euclidean Distance for the measurement between sniper and youth.

In a survey of 100 randomly selected taxi drivers in a city, 76 support increased government spending on roads and bridges. In a survey of 100 randomly selected bus drivers in the same city, 82 support such spending. Compute the test statistic for a hypothesis test to compare the population proportion of taxi drivers to the proportion of bus drivers in the city that support such spending. Assume that the conditions for a hypothesis test for the difference between the population proportions are met. Round your answer to two decimal places.

Imagine that you have been asked by Amazon to submit a bid to build, own and maintain a distribution facility on a remote offshore island off Northeast Canada. The island has a significant population, but no bridges to the mainland. Air and ferry services are very limited. Using economic terminology, discuss what sort of considerations you would take into account when considering the transactions costs associated with this project. What actions would you take to protect your investment should you be the successful bidder?

Record the sales on account of $300 to Wizard Inc. on terms 5/10, n/30.

2Record the cost of goods sold of $170.

3Record the sales on account of $280 to SpyderCorp on terms 5/10, n/30.

4Record the cost of goods sold of $160.

5Record the receipt of payment in full from Wizard Inc.

6Record the receipt of payment in full from SpyderCorp.

7Record the sales on account of $250 to Bridges on terms 5/10, n/45.

8Record the cost of goods sold of $130.

Paper chromatography lab experiment. (color dye)

in the solvent system that you use for analyzing your unknown a)name the important intermolecular forces acting between the dye and the solvent and b)the dye and stationary phase for (i) the dye with the largest Rf value (ii) the dye with the smallest Rf value. comment on the relative important of the types of the forces that result in observe Rf value. c) what statical test could you apply to give some quatitation of your confidence that your known and unknown have the same Rf value?

PLEASE ANSWER ALL 4 QUESTIONS

The owner of a bar wants to know whether their customers prefer Johnnie Walker Whiskey or Seagram's Whiskey. The bar owner is undecided over which of two possible experiments she should use. In Experiment 1, each customer rates only one of the two drinks. In Experiment 2, each customer evaluates both types of whiskey.

Experiment 1
Flip a coin for each customer to choose which type of drink (s)he will taste. Then each person rates the drink from 1 to 10.

Experiment 2
Flip a coin for each customer to choose which types (s)he will taste first. After trying both types of drinks, ask which of the two varieties that (s)he prefers.

Which of the two given designs should the bar owner choose? Please explain your answer.

(2 points) Please indicate which type of sampling design is most appropriate for each of the following studies. The choices are SRS, stratified random sampling, and matched pair design.

Does air pollution induce DNA mutations in mice? 20 male mice were housed in a polluted industrial area downwind from a steel mill. An addition 20 male mice were housed in an unpolluted rural location 30 kilometers away.

Does smoking affect class performance? 300 14 to 22 year old smokers and 300 14 to 22 year old nonsmokers were contacted and asked about their gpa's.

A researcher wants to know the effect of climate change on the percent yield of the corn harvest. They collected the data for the same 50 plots in both 2016 and 2017 for their study.

1- Out of all the potential therapeutic usages of pluripotent stem cells (ESCs and iPSCs only), which one do you think are they MOST promising for? Explain your answer.

2- Both embryonic germ cells and embryonic stem cells are pluripotent cells. They also both express SSEA-1 and TNAP. If you had two culture flasks with cells, one cell type in each and you had forgotten to label your culture flask with the name of the cell line, what could you do to figure out which one is which (i.e. what assay would you perform in the lab) (1 pt)?

3- The intestinal stem cell sits exactly at position 4 in the crypt.

A- What experiment using a DNA analog was performed to find out it is the stem cell? Name AND describe the experiment.

B- At that position, what keeps it from differentiating into a transit amplifying cell?

4- A cell population that you are growing in a culture dish expresses Nanog. However, when cells differentiate into endoderm, Nanog is also expressed in early endoderm cells. How do you make sure the cells in your culture dish are pluripotent stem cells, not endodermal cells?

5- Embryonic stem cells are anchorage dependent cells. What happens when they are placed into specially treated culture plates to which they cannot adhere?