1. Physics

    Can someone please answer my question on this paragraph from my physics book regarding basic aerodynamics: "Now we consider a spinning baseball moving through the still air. As the ball spins, it tends to drag air around with it. If the streamlines are
  2. Leadership-Check #2

    Please check: I believe the essential qualities a leader must possess are to set a vision and to be able to lead. A leader must be able to set a vision to seek for improvement. Seeking for improvement helps make the idea grow better and better. A leader
  3. physics

    1.A 910 kg racecar starts from rest and reaches a speed of 25.1 m/s in 0.48 s. a)What is the average acceleration of the racecar during this time period? b)What is the magnitude of the net force on the racecar? for a) I know: Mass= 910kg V=25.1m/s T=0.48s
  4. math

    A student takes a multiple choice quiz with 12 questions and 5 alternatives per question. Unfortunately, this student has no idea what any of the answers are, so he randomly selects an alternative for each question on the exam. Using this “blind
  5. Chemistry

    We're doing gas problems in chemsitry. I have no idea where to even begin on this problem: Air is 20% oxygen and 80% nitrogen. What is the mass of air in an automobile tire of 19.7 L and internal pressure of 46.7 PSI at 24 degrees celsius? (That pressure
  6. Math

    I know the answer to this problem but I have no idea how to get there. Solve for all values of x if 0 is less than or equal to x, which is less than or equal to 2pie. (cosine squared of 4x) + (cosine of 4x)=0 The answer is: x= pie/8, 3pie/8, 5pie/8,
  7. Chemistry

    Benzene reacts with hot concentrated nitric acid dissolved in sulfuric acid to give chiefly nitrobenzene, C6H5NO2. A by-product is often obtained, which consists of 42.86% C, 2.40% H, and 16.67% N (by mass). The boiling point of a solution of 5.5 g of the
  8. Math

    Solve using Determinants and Cramer's Rule? I was absent and missed the lecture on Cramer's rule and Determinants and have no idea how to start the homework.. The directions and problem are as follows: Using Cramer's Rule, set this problem up to find "a".
  9. Circuits and electronics applications3

    We are working on finding the particular solution for the first-order linear constant-coefficient ordinary differential equation: RCdvP(t)dt+vP(t)=Vicos⁡(ωt) The new idea is to find the particular solution for the related equation
  10. Chemistry

    The formation of tetrafluoroethylene from its elements is highly exothermic: 2F2(g) + 2C(s) F2C=C2F(g) b) Rare bacteria from the planet Teflon eat C2F4 and make Teflon for their cell walls. Will the reaction go to the right or left if these bacteria are
  11. Algebra

    A train leaves Danville Junction and travels north at a speed of 75 km/h. Two hours later, a second train leaves on a parallel track and travels north at 125 km/h. How far from the station will they meet? I have no idea what the system of equations would
  12. Physics

    A 32 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 23.2° the crate begins to slide downward. (a) What is the coefficient of static friction between the crate and the ramp? (b) At what angle does
  13. Physics

    A 32 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 23.2° the crate begins to slide downward. (a) What is the coefficient of static friction between the crate and the ramp? (b) At what angle does
  14. math

    Small cubes with edge lengths of 1/4 inch will be packed into the right rectangular prism. The dimensions are 4 1/2 inches in length, 5 inches in width, and 3 3/4 inches in height. Each cube is 1/4 inches. How many small cubes are needed to completely fill
  15. Chemistry lab

    In my lab class I am having to write a lab experiment and preform it tomorrow. It deals with specific heat of unknown metal and density. the first part you have boil water with the metal in it, and then put it in a cup and measure the temp change. I have
  16. physic

    Please help me I have no idea how to do this problem at all. Question:A sledge loaded with bricks has a total mass of 17.8 kg and is pulled at constant speed by a rope inclined at 20.8° above the horizontal. The sledge moves a distance of 20.6 m on a
  17. criminal justice

    Imagine you were an officer confronted with a hostage situation. Explain how you would use the twelve stages explain how you would use the twelve stages of conflict resolution, and what effective strategies you would use to bring about a positive
  18. Language Art (Please Check)

    1.B 2.A 3.B 1.which of the following is an example of a primary source? A.article written by an expert on the event B.letter from the time of the event C.website 2.When gathering information for a research paper,why is making a source card a good idea?
  19. English help

    Which details can be considered primary support for the main primary suppor for the main idea statement. Many dramatic physical changes occur during adolescence between the ages of 13 and 15 a.voices changes in boys begin to occur at 13 or 14 b.facial
  20. intro to computer

    Search: Your boss is very skeptical about the idea of storing his files up in the cloud rather than on a local storage drive. He asks you to give him the various advantages of cloud storage. Which of the selections below would not be a reason you give him?
  21. Math help - Conversion

    Good Evening everyone I'd like to propose a valid question on the mathmatical topic about finding area's under the speed- time graphs that represent the distance travelled. Iam aware that the area is actually equal to the distance travelled . But reallt
  22. Interest Question

    Hi guys, I'm trying to help my son with this question but I just have no idea how to set it up. I know that I=prt, but I don't understand what to plug in here since we are given two bonds. Anita Ramirez owns two bonds, one paying 8.5% interest and the
  23. College Algebra

    Solve the system of equations with ROWOPS program. I know how to do the first step but after that it gets difficult for me, this is the system of equations: 3x + y - z = 1 x + 2y - z = 0 2x - y + z = 4 I used to be able to do these but now I'm getting a
  24. Physics

    A uniform electric field of magnitude 410 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.00 cm. (a) What is the work done by the field on the electron?(b) What is the change in potential
  25. geometry

    So On the first day of school I went to geometry and we did a review. My teacher had us work out this problem and I've never seen it before. Other kids were doing the problem and I was just there confused. I was embarrassed and didn't want to ask for help.
  26. Physics

    Alright so I need some help were doing Friction and Centripetal Force A 1250 Kg car traveling at 12 m/s is exiting circular highway exit ramp with a radius of 36 meters then I'm asked to find the acceleration the centripetal force the normal foce which I
  27. Science

    What kind of Information can a Compound microscope provide? Much more information than I can type for the next three months. Blood cells, animal parts, leaf structures, snow flakes, and you get the idea. I was sick about two weeks when I was a child and we
  28. Calculus 3

    A medieval city has the shape of a square and is protected by walls with length 550 m and height 16 m. You are the commander of an attacking army and the closest you can get to the wall is 100 m. Your plan is to set fire to the city by catapulting heated
  29. Geometry

    Hi, I need help with this question and it's really confusing me. I have no idea how to approach it. Could someone help me? Thanks in advance! Question: Ship A receives a distress signal from the east, and ship B receives a distress signal from the same
  30. Physics

    A harpsichord string of length 1.50 m and linear mass density 26.0 mg/m vibrates at a (fundamental) frequency of 460.0 Hz. (a) What is the speed of the transverse string waves? m/s (b) What is the tension? N (c) What are the wavelength and frequency of the
  31. civics

    Research how your local government works. Briefly explain the process to pass a law (usually called an ordinance or code) in your city or county. To introduce the idea in my city or county, first I would
  32. science

    After drugs were administered, the brain activity of each person was recorded. This statement should be classified as 1 the problem = the main issue or subject being investigated in the study 2 a method= a procedure , process, or approach used to
  33. Sports and Society in Ancient Greece and Rome

    OK. I am trying to work on a project and I need help with one or two things. 1. I have come up with an idea, but can't seem to get it to fit in the fields of sports or society in the ancient world. I wanted to do a web page on Actaeon and Artemis, but I
  34. French

    Can you make sure these are right, and some of them i just don't know XD l'écu - shield la couronne - cap Les supports - supports devises - No idea @_@ le cimier et le tortil - crest and ? le casque et les mantelets - helmet and short cape la terrasse -
  35. physics

    An insulated copper wire is wrapped around an iron nail. The resulting coil of wire consists of 240 turns of wire that cover 1.8 cm of the nail, as shown in the figure . A current of 0.61 A passes through the wire. if the ferromagnetic properties of the
  36. Introduction to Graphic Design

    Hello! Thanks for checking my question out! ____ 9. There are two sculptures of George Washington. One sculpture makes use of sharp edges and abstract shapes, while the other captures a more realistic view. Which of the following is different about these
  37. physics

    Objects with masses of 190 kg and a 490 kg are separated by 0.380 m. (a) Find the net gravitational force exerted by these objects on a 57.0 kg object placed midway between them. N (b) At what position (other than infinitely remote ones) can the 57.0 kg
  38. Philosophy

    Please help answer these questions Argument: Anything is possible Therefore, it must be possible that something is impossible This is a contraction - Not everything is possible because anything is possible. Types of appeals in arguments (Aristotle) Pathos
  39. Statistics

    A density curve like an inverted letter "V" The first segment goes from the point (0, .6) to the point (0.5, 1.4). The second segment goes from (.05, 1.4) to (1, .6) Find the percent of the observations that lie below .3 I have no idea how to do this If
  40. Psychology

    I am writing a paper and am stuck on one part can some give me an idea what i am needing. paper in which you analyze the function of emotions as motive. Be sure to address the following items on your analysis: This is the part I am stuck on Analyze at
  41. Language Arts

    1. List some ideas that The Giver includes. Why did you choose those ideas? 2. Tell how using a reading role helped you understand the book. Support your response with at least two pieces of evidence from the novel. For the first one can someone help me
  42. English

    Could you please check the following sentences, please? Thank you. 1)I'm still waiting to receive an answer from the principal of the German school to see if they are willing to accept your school in our Comenius partership. 2) In any case, our science
  43. English

    I included only 4 sentences for you to check. Thank you. 1) Refer then to the episodes which lead to the abolition of slavery. 2) He provides us with several epigrams –short and clever amusing sentences – which express his idea in a clever and amusing
  44. Science

    Science project ideas for science fair. I need to prepare a model for science fair. But I need some ideas about the major problems facing today's world. So that I can get idea for improvement in any area and to show this in science fair. Please get me know
  45. PLZ Help History--@Ms. Sue

    Native American knowledge helped European settlers in many ways. Which of the following best illustrates this idea? Some Native Americans converted to Christianity. Some Native Americans allowed Europeans to join their society. Some Native Americans traded
  46. Physics

    I don't really understand this aspect of physics yet, I need help understanding these problems. Problem One: Two particles, with identical positive charges and a separation of 2.00 10-2 m, are released from rest. Immediately after the release, particle 1
  47. ss

    1.which of the following best describes the conservative democrats in south carolina during reconstruction? a. they favored small land owners and workers b. they were wealthy and formerly confederate leaders c. the believed in social equality between races
  48. my topic. students, please post ur opinion too.

    hi i need help coming up with topics for my argumentative essay. we can't write about topics such as abortion and gay rights and marriages like that. my teacher said to pick local issues in our town to write about. but there are no topics in my town to
  49. Chemistry

    Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case is allowed to come to equilibrium. Which one of these experiments would yield values for the
  50. PLEASE HELP ME! PLEASE!

    1 )3x + 8y = 1 7x + 4y = 17 Answer: (3,1) 2) -3x + 5y = -7 9x + 2y = 38 Answer: (4,1) 3) 7r + 3s = 13 14r - 15s = -16 Answer: (1,2) 4) 2x - 7y = 42 4x - 14y = 64 Answer: No Solution ?? 5) 9x + 12y = 15 3x + 4y = 5 Answer: Identity ?? 6) 2 = 4s - 3t 2 = 12s
  51. math

    Would this be a good resource for my students? This website? Yes, I believe so. We have several people who are very good at helping students with their math homework questions, from elementary school through college levels. Be sure to check out the
  52. Public Speaking

    I need help writing a speech out on the following topic:Why banning the use of cell phones while driving should be mandatory nationwide. tate the general purpose, specific purpose, and central idea clearly and in the appropriate form.4. Limit your main
  53. Social Studies

    1.King John of england signed the magna carta in 1215. What idea did the founding fathers borrow from this document to include in the bill of rights? A. People accused of a crime have a right to a trial by a jury of their equals B. People accused of a
  54. Chem Help Please!

    Separation / Chromatography Lets assume I have three component mixture of liquids. And I wish to determine the quantity of each component present. I have reference samples of two of the components but the other component is not identified. How do I design
  55. Writing

    i need a idea about a story novel, it has to have the following somewhere in the story it has to mention the hawiian king it has to be realist fiction it had to be charater vs charater i need the CONFLICT OF THE STORY!! please if can i need it by tomorrow
  56. Math Binomial theorem

    I'm preparing for a test and one of the questions in my text is as follows: In a trivia contest,Sam has drawn a topic he knows nothing about, so he makes random guesses for the 10 T/F questions. Use the binomial theorem to help find a)the number of ways
  57. Chem Help Please!

    Separation / Chromatography Lets assume I have three component mixture of liquids. And I wish to determine the quantity of each component present. I have reference samples of two of the components but the other component is not identified. How do I design
  58. english

    Thanks for the help on putting up fence. I need help with starting general information (Background on illegal immigration& putting fence) How can I start with the background information on putting up fence? is it approiate using "THey or It is said? I just
  59. calculus

    Find an equation of the tangent line to the curve at y = cosx - sinx (pi, -1) I found y'= -sinx - cosx and used the equation of the tangent y = mx +b I input the values and get -1 - [(-sinx - cosx) * pi] = b the answer says it is y = x - 1 - pi I have no
  60. MATH

    HELP !!! Which statistics concept is described? Choose from these answers: [(A):statistical test] [(B):Null Hypothesis] [(C):alpha] [(D):one-tailed test] [(E):two-tailed test] [(F):Type I error] [(G):Type II error] [(H):the statistic Z] 1)When a hypothesis
  61. algebra

    please explain the step for this I have no idea. the speed of the current in a river is 6 mph a ferry operator who works that part of the river is looking to buy a new boat for his business everyday his route takes him 22.5 miles against the current and
  62. algebra

    please explain the step for this I have no idea. the speed of the current in a river is 6 mph a ferry operator who works that part of the river is looking to buy a new boat for his business everyday his route takes him 22.5 miles against the current and
  63. Physics

    The (nonconservative) force propelling a 1.50E3 kg car up a mountain road does 4.70E6 j of work on the car. The car starts from rest at sea level and has a speed of 27.0 m/s at an altitude of 2.00E2 m above sea level. Obtain the work done on the car by the
  64. trig/physics

    Three positive particles of equal charge +11.o micro C, are located at the corners of an equilateral triangle of sides 15.0cm. Calculate magnitude and direction of the net force on each particle. DUUUUUUUUUH! THIS IS SO EASY! LOOK IN YOUR BOK, IDIOTIC
  65. Algebra 1

    Entomology is the scientific study of insects. Patty, Ronny and Sammy collected some insects for their science project. At the end of the first week of collecting, Patty and Ronny together had 89 insects, Ronny and Sammy together had 80 insects, and Patty
  66. Chemistry

    I did a lab that involve cooking meat and finding the mass of lipids, meat tissue and water. For a chicken sample the original mass was 20 gram. After cooking there was 15.5g of meat, and 1.5 g of oil, and 1 g of water. I am missing 2 g of the original
  67. algebra

    Two Questions: 1) A certain radioactive isotope has leaked into a small stream. 100 days later after the leak 10% of the original amount of the substance. Determine the half-life of this radioactive isotope. 2) During a research experiment, it was found
  68. English

    Which of the following is not true? A. Alvarez's imagery allows the reader to see and hear her speaker's neighborhood. B. Alvarez's tone is measured and wry. C. Alvarez's speaker wishes to take the reader into her confidence. D. Alvarez's diction, or word
  69. physics

    A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc
  70. SQL for business help

    I have no idea where to begin with this. A SQL statement that creates a user defined function that returns an int value is needed. This int return value is obtained by deducting the lowest Count field value from the highest Count field value of the Part
  71. Math2

    The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m), separated by a distance (r), is given by the expression F = ( -GmM )/r^2 a) What mathematical expression characterises the instant
  72. physics

    A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc
  73. Chemistry grade 11

    Okay I've got a HUGE chem test tomorrow and I desperately need help! Please help!!!! 73. Hematite (Fe2O3) and magnetite (Fe3O4) are two ores used as sources of iron. Which ore provides the greatest percentage of iron per kilogram? 78. A hydrate contains
  74. chemistry_toughhhh

    Initial rate of rxn of H2O2(aq)->H2O+ 1/2 O2(g) is found at 1.7x10(-3)M/s and is constant for 2min. You start with 160ml of 16M H2O2. How many mL of O2 in one minute? (Measured at 273K and 760mmHg). I tried to find the new conc of H2O2 via NewConc= Old
  75. U.S History

    Imagine you are one of the factory workers at Lowell Mills tasked with creating the headline story for this month’s factory newspaper. Factory Workers—Factory Worker Template 1. First paragraph: Hook your reader into wanting to read your article.
  76. English {2 Questions}

    1. Identify the statement that is a verifiable fact. A. Teenagers seem to prefer texting to talking when it comes to cell phone use. B. Lifeguarding is one of the easiest and most lucrative summer jobs for teenagers. C. The number of teenagers who own and
  77. PHYSICS HELP!

    IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so
  78. economics

    i need to submitt a project on "consumer awareness in india" so plsss write in detail about:-consumer awareness and its need , role of producers in protecting consumer rights , a case regarding an incident of violation of consumer rights. I WILL BE REALLY
  79. Calculus - please help!

    Suppose that 0 < c < ¥ð/2. For what value of c is the area of the region enclosed by the curves y = cos x, y = cos(x - c), and x = 0 equal to the area of the region enclosed by the curves y = cos(x - c), x = ¥ð, and y = 0? i have no idea how to solve
  80. math

    from a jar of red jellybeans and white jellybeans, the probability of picking a white jellybeans is 2/3. if the jar contains 24 jellybeans, how amny red jellyeans are in the jar 1 6 2 8 3 12 4 16 plz help i have no idea about this
  81. physics homework

    can you please check my answers? 10. when rewinding a an audio tape or vdieotape, one reel winds fastest at the end. which reel is this? why does it speed up? -The reel is the left and it speeds up because of its greater rotational intertia is near the
  82. Chemistry

    Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case is allowed to come to equilibrium. Which one of these experiments would yield values for the
  83. French

    I have this chart thing made for french with all the months, and I basically have to list down holidays and stuff which occur in those months and that too in French. So this is what I have so far, and please add anything that I don't have. Thanks *I also
  84. maximum and minimum problems when function unknown

    Hi, can anyone please help me with this problem, i have no idea what to do! The question is: a window frame is in the shape of a semicircle joined to a rectangle. Find the macimum area of a window using 300 cm of framework. i can usually solve these sorts
  85. Chemistry

    A saturated solution of MgF2 at 23 degrees C was prepared by dissolving solid MgF2 in 1 L water. The Ksp of MgF2 is 1.5e-5. a.)Calculate the mass of MgF2 dissolved. b.) When .1 mols of solid KF was dissolved in the MgF2 solution, precipitation was
  86. English

    aside from any grammar or spelling mistakes how is this essay! Can the perfect ideal of loyalty ever be achieved? With no guidelines how can you match a book definition of loyalty. Loyalty is essential in human life, but what is it. The dictionary will
  87. English

    1.With a winter storm (blustering bungling) outside what could be more welcome than a warm room, a good meal, and my favorite TV program? blustering? 2.The idea that most people usually behave calm and reasonable way is (refuted numbed) by all the facts of
  88. English

    1. How is Sophocles’ goal of returning to the Hellenic perspective supported in “Oedipus the King”? What must have been his purpose? 2. Choose the quote "The only conception of freedom I can have is that of the prisoner or the individual in the midst
  89. Physics

    I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth,
  90. physics

    I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth,
  91. physics

    A pendulum consists of a uniform disk with radius r = 10 cm and mass 480 g attached to a uniform rod with length L = 500 mm and mass 175 g. (a) Calculate the rotational inertia of the pendulum about the pivot. (b) What is the distance between the pivot and
  92. college HIST

    The Age of Jackson is often seen as a turning point in American politics, one where we turn from a politics where few could vote or hold office to one where many could. Define Jacksonian Democracy and show how it changed the political system from what came
  93. Chemistry Help Please!!!

    Find Net Ionic equation for hydrolysis , Expression for equilibrium constant (Ka or Kb) and Value of (Ka or Kb) Net Ionic equations I've got NaC2H3O2 == CH3COO^-+H2O -->CH3COOH+OH^- Na2CO3 ==== CO3 + 2H2O → H2CO3 + 2-OH Kb = [H2CO3] [-OH]2 / [CO3]. Kb =
  94. physics

    Ok, so I know the different kinds of forces (applied, normal, gravity, parellel, and friction). And I know how to sub in other numbers for those forces ( for example, Parallel force is equal to mass times gravity times sine theta). I also know the "base"
  95. reading

    In this passage I need to find the main idea and 3 supporting details. You have probably gone on a merry-go-around. Theres one at most theme and carnivals. You find a painted horse or other animal. You climb up on its back. Most of the animals are on the
  96. Social Studies

    Multiple Choice ____ raised 12 sons, who became the 12 tribes of Israel. A. Cyrus B. **** Jacob C. Abraham D. Moses ============== Who led the Israelites out of Egypt and into the Sinai Desert? A. Jacob B. ********* Moses C. the Maccabees D. Pharaoh
  97. Health

    I chose 5 points as you suggested to me. Thank you very much, Writeacher. 1) The difference about advertising today is that….. 2) Children cannot oppose their appearance in ads. Children want to buy everything they see (not all they see?) on TV or
  98. Science

    1.)When evaluation was first processed which of the following was used as evidence to suport the idea (1 point) a.)observations of nature**** b.)laboratory experiments c.)extensive fossil collections b.)genetic sequence 2.)a farmer sprays insecticide on
  99. Earth Science

    1. We start with 400 atoms of Uranium-238. How many remain after 4.5 billion years? _______ After 9 billion years? _______ After 13.5 billion years? ________ 2 . How long will it take for ½ of the original amount of Rubidium-87 to decay? _______ 3.
  100. American History

    What was the significance of the Treaty of Tordesillas? It provided Portugal with the opportunity to establish colonies in the Americas. It established the line of demarcation that granted Spain the right to lands in the Americas and Portugal the right to