Blog

Suppose a satellite is in a low-Earth orbit. Is it possible that the satellite will eventually fall to the ground? Why or why not? (Hint: Do not forget to consider presence of the Earth atmosphere!)

Bonus Question According to the video about the credit card default, you were given the following two tables: Coef z-stat intercept -3.50 -49.55 student 0.40 3.52 and Coef z-stat intercept -10.87 -22.08 balance 0.01 24.74 income 0.00 0.37 student -0.65 -2.74 Why do the coefficients of student have different signs in these two tables?  The Best reason is:

An object’s velocity v as a function of time t is given in the graph above. Which of the following statements is true about the motion of the object?

A newly designed screening test called GatorTest has a sensitivity of 56% and a specificity of 69% when used to detect GatorBait Disease. Given this information, which of the following statements is TRUE regarding the performance of the GatorTest?

A bicyclist moves in a straight line, initially at 10 m/s, uniformly increases its speed to 14 m/s covering a distance of 48 m. What is the bicyclist’s acceleration?

Intervention in anemia of chronic disease most often includes:

You are asked to design a preventive intervention for Gastroenteritis, a very severe disease in Gainesville where early detection is crucial to avoid extreme medical complications and fatality as the disease progresses. The cost of screening and early treatment is much lower than the cost of treating late-stage disease. UF has developed a new version of the Gastroenteritis Screening Test called Test A. As part of the intervention, you will conduct a screening test to detect gastroenteritis among 15,600 individuals using the recently developed Test A. The disease prevalence of gastroenteritis in our study population is reported as 5.0%. Based on this information, the following is a 2×2 table depicting your study results for Test A: Test A   Gastroenteritis Present Gastroenteritis Absent Positive Test Result 585 2223 Negative Test Result 195 12597   The development team also provided you with the older original version of the test, which they labeled as Test B, as a potential alternative for your intervention. You decide to collect data on Test B to compare with the data you collected using Test A.  Based on this information, the following is a 2×2 table depicting your study results for Test B: Test B   Gastroenteritis Present Gastroenteritis Absent Positive Test Result 546 5187 Negative Test Result 234 9633   Note-If it is appropriate to report an answer value as a percentage and you would like to input your answer in percent format, you must include the % sign! Please round your answers to the nearest tenth decimal place (i.e, x.x%)    a. Calculate the sensitivity for Test A: [SensitivityA]  b. Calculate the specificity for Test A: [SpecificityA]  c. Calculate the sensitivity for Test B: [SensitivityB]  d. Calculate the specificity for Test B: [SpecificityB]  e. If we repeated this study using Test A and Test B in a new population that has a 40% prevalence of Gastroenteritis, we would see an increase in the [___] of the new population (compared to our first population with 5% prevalence of Gastroenteritis).  Choose your answer from either the PPV or NPV.  

A small cart is rolling freely on an inclined ramp with an constant acceleration of 0.50 m/s2 in the –x-direction. At time t = 0, the cart has a velocity of 2.0 m/s in the +x-direction. If the cart never leaves the ramp, which of the following statements correctly describes the motion of the cart at a time t > 5 s?

Complete each sentence about Véronique’s workday by using the adjective indicated at the start. Attention! Be sure to place the adjective in its appropriate position, either in the blank space before or after the noun, and make sure it agrees in grammatical gender and number with the noun. PUT AN UPPERCASE “X” in the other, UNUSED blank space – don’t leave anything empty!    vieux: Véronique habite un      appartement      à Montréal. bleu: Pour aller au travail, elle prend (takes) la      ligne      du métro. suisse: Elle travaille pour une      banque      . riche: Elle a certainement des      clients      ! joli: Elle déjeune à midi dans les      cafés      du quartier (neighborhood) de la banque. nouveau: Aujourd’hui, elle a rendez-vous avec deux      employés      de la banque, Vincent et Brian. jeune: Quand elle rentre du travail, elle dit (says) bonsoir au      couple      qui habite en face (across [the hall]). dernier: La      semaine      , elle a voyagé (traveled) à New York pour son travail.  

Complete each sentence with the preposition à or de + the correct definite article. Attention! Be sure to consider the grammatical gender and number of each sport, game, or musical instrument.     Jacqueline aime la trompette. Elle joue      trompette dans un orchestre. Jacques aime la pétanque (lawn bowling). Il joue      pétanque au parc. Laurence aime le piano. Elle joue      piano depuis (for) cinq ans. Laurent aime les cartes. Il joue      cartes le samedi soir. Martine aime l’alto (viola). Elle joue      alto dans un quartet.  Martin aime le volley. Il joue souvent      volley le week-end en été.