1. physics

    point a is located 0.25 m away from a charge of -2.1 x 10 -9 C. point b is located 0.50 m away from the charge. what is the electric potential difference Vb - Va between these two points?

    asked by kim on May 2, 2010
  2. Math

    Consider the function f(x) = -2 x^3 + 36 x^2 - 162 x + 2. There are two critical points, A and B where A < B: A = and B = f''(A)= f''(B)= Therefore f(x) has a relative at A (MAX or MIN) and a relative at B (MAX or MIN).

    asked by Andrew on February 17, 2014
  3. physics

    Truck brakes can fail if they get too hot. In some mountainous areas, ramps of loose gravel are constructed to stop runaway trucks that have lost their brakes. The combination of a slight upward slope and a large coefficient of friction in the gravel

    asked by amy on October 31, 2009
  4. Physics

    An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

    asked by Frank on December 13, 2014
  5. Science

    In a(n) ___, the particles form a regular, repeating pattern. Answerlist: viscous liquid melting liquid amorphous solid or crystalline solid

    asked by A.J on April 8, 2014
  6. physics

    In a visit to the nation's capital, a foreign head of state travels from (−3.0, −4.0) km to (4.0, 7.0) km. She then travels with a displacement of (−5.0, -3.8) km. Calculate the her total displacement over the course of the trip. ANSWER SHOULD BE IN

    asked by mel on December 19, 2010
  7. Chem Simple question

    Magnesium metal burns in oxygen to form magnesium oxide, MgO. (a) Write a balanced equation for the reaction Why is it 2Mg+O2->2MgO and not Mg+O->MgO

    asked by Julie on September 29, 2013
  8. Trigonometry One Quick Question! Please help!

    Triangle ABC has side lengths 7, 24, and 25. Do the side lengths form a Pythagorean triple? Explain. Thank You so much! :) I'm having a hard time understanding this so it means alot!

    asked by Amaya on February 20, 2012
  9. math

    Suppose the cards shown are mixed and placed facedown. Think about drawing a card and without replacement drawing a second card. Give the probability in simplest form: P(A, B) = _____ ————— ————— ————— ————— | A | |

    asked by Cheril on April 9, 2012
  10. Physics

    An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

    asked by Frank on December 13, 2014
  11. Calculus

    Use the Laws of logarithms to rewrite the expression log(1000000x^19)in a form with no logarithm of a product, quotient or power. After rewriting we have log(1000000x^19)= A + Blog(x)? I know B = 19, but what's A?

    asked by Ann on May 18, 2014
  12. Physics Help PLEASE!!!

    What approximate change in decibels does an observer experience form a sound source if the observer moves to a new location that is 67% as far from the source? 23 -23 40 2.76 -2.76 1.94 -1.94 2.57 -2.57 0 do I multiply .67 times 10 log .67?

    asked by Jael on November 30, 2010
  13. chemistry

    9. The reaction of 50 mL of N2 gas with 150 mL H2 gas to form ammonia via the equation: N 2(g) + 3H2 (g) → 2NH3 (g) will produce a total of mL of ammonia if pressure and temperature are kept constant

    asked by Anonymous on August 12, 2014
  14. Chemistry

    At high temperatures, sulfur combines with iron to form the brown-black iron (II) sulfide: Fe (s) + S (l)--> FeS (s) How do you calculate the mass of FeS formed? Thank you!

    asked by Mary on June 25, 2011
  15. Form a polynomial f(x) from coefficient and it's 0

    Form a polynomial, f(x), with real coefficients having the given degree and zeros. Degree: 4; zeros: 6i and 7i I completely don't know what to do with this problem... if someone can solve and give a good explanation, I'd appreciate it. Thanks.

    asked by Armando on May 30, 2011
  16. Algebra

    Case facts: Y=326.2x- 241.6 What is the standard form of the linear model? The answer is: 1631x-5y= 1208 Please explain step by step how this is the answer.

    asked by Kimmy on March 2, 2016
  17. Algebra

    The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=-3t^2+18t+53 where 1

    asked by Kylet davis on March 2, 2016
  18. CHEM

    Aluminum reacts with Chlorine gas to form AlCl3. [2Al(s)+3Cl2(g)=2AlCl3(s)] Given 11.0g of Al and 16.0g Cl2, if you had excess Al, how many moles of AlCl3 could be produced from 16.0g of Cl2?

    asked by leng on September 22, 2012
  19. Algebra 1

    Hello. Can someone show me how to 'multiply and express the product in simplest form.' If I can get a detailed example for the first one, I could go my own way for the other two. 1. x - 3 (_______)^3 . 1 2 (______)^2 x - 3 2. x^2 - 9 _______ . x^2 - 4 x +

    asked by Charlezetta on June 8, 2010
  20. Music

    The 12 Bar Blues is a chord sequence based on chords I, IV, and V. Complete this chord pattern below: I I ? ? IV ? I I V ? ? ? Here is the form in Blues... T T T T S S T T D S T T Where the T, S, and D refer to Tonic, Subdominate, and Dominate. Thank you

    asked by Ayesha on September 17, 2006
  21. earth science

    how do chemical rocks form, are some types of limestone considered a chemical rock, and what mineral does rock salt crystalize from. thank you if you choose to answer. im so stumped.

    asked by ting on October 9, 2008
  22. earth science

    how do chemical rocks form, are some types of limestone considered a chemical rock, and what mineral does rock salt crystalize from? thank you so much if you choose to answer. im so stumped.

    asked by ting on October 9, 2008
  23. Math

    What is a simplified form of the expression [sec^2x-1]/[(sinx)(secx)]? a. cot x b. csc x c. tan x***** d. sec x tan x I think this is the correct answer, but I do not understand why. Can someone please explain?

    asked by girly girl on April 27, 2018
  24. maths help plz

    A certain number of children are arranged in a circular form,if they are evenly spaced,the 7th child is directly opposite to the 8th child.... how many children are their altogether? thanks

    asked by david on April 17, 2016
  25. Algebra

    The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=-3t^2+18t+53 where 1

    asked by Kylet davis on March 4, 2016
  26. Algebra

    The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=-3t^2+18t+53 where 1

    asked by Kylet davis on March 3, 2016
  27. Chemistry

    A reaction of the form aA-----products is second-order with a rate constant of 0.225 L/(mol/s). If the initial concentration of A is 0.293 mol/L, what is the molar concentration of A after 35.6 secs?

    asked by Yesenia on September 26, 2010
  28. Algebra

    The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=-3t^2+18t+53 where 1

    asked by Kylet davis on March 2, 2016
  29. Chemistry

    How many electrons are transferred when C3H7OH burns in oxygen to form carbon dioxide and water? I have no idea where to start. Do I need to do half reactions? Can I even do half reactions for this?

    asked by Suzie on October 8, 2009
  30. anonymous

    what atoms usually form coordinate covalent bonds i couldn't find this anywhere also i just want to make sure is the electronegativity difference range for polar covalent bonds .4 - 2.1 paulings?

    asked by lyne on June 7, 2009
  31. Algebra

    The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=-3t^2+18t+53 where 1

    asked by Kylet davis on March 2, 2016
  32. Algebra

    The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=-3t^2+18t+53 where 1

    asked by Kylet davis on March 2, 2016
  33. Math

    The smallest marine fish known is the dwarf goby. The average length of this fish is just 3.39 x 10^-1 inches. What is this number in standard form? A.339 B.33.9 C.0.339 D.0.0339 C

    asked by Jerald on October 9, 2013
  34. Algebra

    The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=-3t^2+18t+53 where 1

    asked by Kylet davis on March 2, 2016
  35. Advance function

    given that sinx, tanx, and sin2x form geometric sequence, show cos^3x=1/2 can someone explain this to me, i have no idea how to solve it. i really done understand how to turn it into a geometric sequence

    asked by AA on November 5, 2016
  36. math

    Suppose you choose a letter at random form the word ARITHMETIC. What are the oods in favor of selecting a vowel. What are the odds against selecting a vowel? 2/5 abd 3/5?

    asked by Anonymous on November 3, 2010
  37. Rate measure

    A balloon in the form of a right cone surmiunted by a hemispere,having a diameter equal to height of the cone,is being inflated.how fast is its volume changing w.r.t its total height 'h' when h

    asked by Abhi on July 1, 2012
  38. geometry

    f equilateral triangle JKL is cut by three lines as shown above to form four equilateral triangles of equal area, what is the length of a side of one of the smaller triangles?

    asked by Anonymous on March 29, 2012
  39. Pre Cal

    a 6 foot person is standing x feet away form a 10 foot lamppost. What is the distance d from the base of the lamppost to the end of the persons shadow, espressed as a function of x.

    asked by Ashley on July 24, 2011
  40. Chemistry

    In terms of its structure and intermolecular forces, why is neoprene able to stretch? I want to say it's because its carbons form a long chain which easily stretches, but I'm not sure how intermolecular forces factor into that. Thanks!

    asked by SarahF275 on December 13, 2017
  41. Science (Forming Compounds)

    Can Magnesium and Sulphur form a compound? If so, what is the chemical formul of the compound? MgS magnesium sulfide http://en.wikipedia.org/wiki/Magnesium_sulfide

    asked by Bianca on November 5, 2006
  42. ms.sue 5 grade math

    Lindsay will lay a certain number of 18-inch square tiles in a line to form a walkway. Which of the following is NOT a possible length for the walkway if she uses only whole tiles? A. 6 ft B. 10 ft 6 in. C. 25 ft 6 in. D. 32 ft yesturday you tell me about

    asked by dw on March 28, 2012
  43. math

    A number cube is rolled 450 times. The number 3 comes up 67 times. What is the theoretical probability of rolling a 3? Write your answer as a fraction in simplest form.

    asked by Me on May 19, 2019
  44. chemistry

    When water decomposes into oxygen and hydrogen, the mass A. increases B. varies according the number of hydrogen and oxygen molecules that form. C. remains constant D. decreases

    asked by Yui on August 23, 2014
  45. chemistry

    ( from the previous chemistry question)hydration just means H2O would attach to the ions, right? would the H2O attach to the -F to form larger molecules? how does the entropy change from that?

    asked by carla on April 19, 2010
  46. math

    The lower leg of a right triangle is 8 cm in length. Calculate the other two knowing that the sides of the triangle form an arithmetic sequence. please give me step by step answers thanks

    asked by saraah on June 3, 2013
  47. Chemistry

    You can purchase hydrochloric acid in a concentrated form that is 37.0 hcl by mass and has a density of 1.20g/mL. Describe how exactly you would prepare 2.85 L of 0.500 M HCL from the concentrated solution.

    asked by Rebecca on May 7, 2014
  48. chemistrt

    17.8 g of CH4 react with 55.4 g of O2 to form CO2 and H20 identify the limiting and excess reagent. what is the mass of CO2 produced? how much excess reactant is leftover?

    asked by Skye on December 11, 2011
  49. AP Chemistry

    Write the expression of for the base dissociation constant for hydrazine, N2H4, a weak base. Hydrazine reacts with water to form the N2H5+ ion.

    asked by Angie on January 11, 2010
  50. Algebra

    One inch is equal to approximately 2.5 centimeters. Let x represent inches and y represent centimeters. Write an equation in standard form relating x and y. Give the values of A, B, and C.

    asked by Loren on November 8, 2010
  51. math

    A department contains 12 men and 17 women. How many ways are there to form a committee with 6 members if it must have strictly more women than men? It is strongly recommended that you do this on paper! how do i solve this in the calculator?

    asked by marissa on October 10, 2010
  52. Cards

    If you randomly select a card from a well-shuffled standard deck of 52 cards, what is the probability that the card you select is a club or 5? (Your answer must be in the form of a reduced fraction.)

    asked by Anonymous on October 1, 2016
  53. Science

    How to balance reaction of solid calcium carbide (CaC2) with excess water to form acetylene gas (C2H2) and solid calcium hydroxide?

    asked by Mary on January 13, 2016
  54. math

    a computer is being lowered into the ocean from a platform. at this moment it is 210 feet below surface and being lowered 150 feet every 30 minutes. how to write this in the form of an expression?

    asked by arc on August 17, 2014
  55. chemistry

    Identify the limiting reactant and determine the mass of the excess reactant remaining when 7.00 g of chlorine gas reacts with 5.00 g of potassium to form potassium chloride.

    asked by Rafael Alvarez on December 11, 2009
  56. English

    A: May I take your order? B: Yes, please. I'll have a chicken sandwich. A:Sure. Anything else? B: One small orange juice, please. (Conversation at a sandwich shop) ============================== Q1: What is the meaning of 'Sure'? Why is 'Sure' used here?

    asked by rfvv on June 15, 2015
  57. Math

    I need some help with this question. I am getting a different answer (the actual answer should be 259). Question: When the repeating decimal 0.476 is converted to a rational in simplest form a/b the value of b-a is? Show your work.

    asked by Kassie on January 19, 2019
  58. Math

    Tim deposits $10 every month into a retirement account which averages 18% interest compounded monthly. How much will be in this account after 45 years? (The number of years form age 20 to 65))

    asked by Mai on April 17, 2014
  59. Geometry

    A piece of paper in the form of a sector of a circle of radius 15 cm is rolled into a cone. Calculate the volume of the cone if the angle of the sector is 240 degrees.

    asked by Raven on May 7, 2016
  60. Math probability

    You roll two fair 6-sided dice. Let be the sum of the two independent rolls. (a) Give the PMF of in table form. (b) Give a mathematical expression for the PMF of .

    asked by Ozan on April 19, 2014
  61. MATH

    a fraction with a denominater in the thousands will always have a decimal form with more decimal places than a fraction with a single-digit denominator. How would I determine if this statement is true or fals?

    asked by DEBBIE on April 14, 2010
  62. Literature

    In Never Let Me Go, Kathy addresses us directly, with statements like "I don't know how it was where you were, but at Hailsham we used to have some form of medical every week" [p. 13], and she thinks that we too might envy her having been at Hailsham [p.

    asked by McGraw on July 24, 2013
  63. books

    In Never let me go, Kathy addresses us directly, with statements like "I don't know how it was where you were, but at Hailsham we used to have some form of medical every week" [p. 13], and she thinks that we too might envy her having been at Hailsham [p.

    asked by mcgraw on July 24, 2013
  64. Science

    4.9 gram H2SO4 is mixed with water to Form 5 litres of aqueous solution. Find It's Concentration . ( Molecular weight Of H2SO4 is 98 gram / mole .)

    asked by Mehulsinh on January 15, 2019
  65. Dynamic n vibration, physics

    A system is represented by the equation: 2x”+128x = f(t) Obtain the free response of the system in the form a) x = A sin wn (t ) + B cos wn (t) b) x= A sin wn (t) + ϕ The initial conditions are x(0) = 0.05m and x’ = 0.3m/s.

    asked by Chad on October 11, 2017
  66. Spades

    If you randomly select a card from a well-shuffled standard deck of 52 cards, what is the probability that the card you select is a spade or 6? (Your answer must be in the form of a reduced fraction.)

    asked by Anonymous on October 1, 2016
  67. Algerbra

    A rectangular flower garden is 4 feet longer than its width w. Write a polynomial that represents the area of the garden. Write your answer in simplified form.

    asked by Mckenzie on May 18, 2015
  68. trig

    find the exact solutions (è in degrees) sin^2è+2cosè=-2 change the sin^2 to 1-cos^2, then rearrage the equation into quadratic form, use the quadratic equaion.

    asked by Devon on April 16, 2007
  69. PHYSICS!

    an object weighs 528.0 Newton. It is being pushed along a horizontal surface by a 475.0-Newton force. Determine the mass of the object in a numerical form.

    asked by Michael on October 31, 2012
  70. Probability

    If you randomly select a card from a well-shuffled standard deck of 52 cards, what is the probability that the card you select is a 3 or King? (Your answer must be in the form of a reduced fraction.)

    asked by vinicio on March 25, 2016
  71. math

    a student is selected at is the probability the the randomly selected stundent is neither a 10th grade nor an 11th grade express your answer in fraction in simplest form

    asked by a student is selected at is the probability the th on August 25, 2011
  72. physic

    A particle with mass m = 3.80 kg accelerates according to a = (−2.60i + 1.70j) m/s2. (a) What is the net force acting on the particle? (Express your answer in vector form.) F = N (b) What is the magnitude of this force? N

    asked by joy on February 5, 2018
  73. Physics

    An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

    asked by Joe on November 30, 2012
  74. Math/Algerbra

    A patient is prescribed 173 mg of medication. The medication comes in the form of a solution, 87 mg/4 mL. To the nearest millilitre, how many millilitres does the patient receive in one dose? Include the unit mL.

    asked by Katelynn on January 25, 2017
  75. math

    If you randomly select a card from a well-shuffled standard deck of 52 cards, what is the probability that the card you select is a Jack or 2? (Your answer must be in the form of a reduced fraction.)

    asked by Anonymous on March 28, 2016
  76. Calculus - Approximation

    Use linear approximation, i.e. the tangent line, to approximate cubed root { 1.1 }. The equation of the tangent line to f(x) at x = 1 can be written in the form y = mx+b. Show your work. Do not use a calculator.

    asked by James on October 7, 2016
  77. Math

    The region above the curve y = sin^-1(x), (0 greater than or equal to y greater than or equal to pi/4), is rotated about the y-axis through a complete revolution to form a solid. Evaluate the volume. Thanks!

    asked by Candice on April 19, 2012
  78. chemistry

    3. If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Use molecular weight: HCl, 36.46 amu] 5.20/36.46= 0.1426 X 3.00=0.428 M IS THIS CORRECT

    asked by Anonymous on November 8, 2014
  79. chemistry

    very hot sinc will react with steam to form zinc oxide and hydrogen. If 5.4 liters of hydrogen was used to use up 20 g of zinc completely. What is the percent yield of this process

    asked by jean on February 12, 2014
  80. Math

    I need to change this expression to postfix form. (12*A^2-2*A+31)/(4*A+6) I know how to do this except for the squaring part. I got stuck. This is my try. 12 A 2 ^ * 2 A * - 31 + 4 A * 6 + / When I test this in a calculator, it gives different results.

    asked by Sara on April 15, 2013
  81. pre cal

    Write a polynomial function of minimum degree with real coefficients whose zeros include those listed. Write the polynomial in standard form. 3, -13, and 5 + 4i Urgently need help

    asked by Jorgeeee on June 29, 2014
  82. Calculus

    Find the limit as x approaches infinity of sin(2x)/x The answer is 0. How can I show that this is an indeterminate form so I can use L'Hopital's? And even if I use L'Hopital's, it comes out to be 2cos(2x), which doesn't help if I replace x with infinity.

    asked by John on November 22, 2008
  83. algebra

    1. Write z^9/z^3 in simplest form. a. z^3 b. z^6 c. z^12 d. z^27 2. Which symbol will make the number sentence true? 6/7 ? 0/85 a. = b. < c. > 3. Which of the following numbers is an example of an integer? a. 5 (square rooted) b. 9 (square rooted) c. 1/3

    asked by Bethany on February 27, 2019
  84. Chemistry

    Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.7 x 10-4 M O2 at 25oC. The Henry's Law Constant for oxygen in water at 25oC is 1.3 x 10-3 M/atm

    asked by Zoe on February 7, 2012
  85. chemistry

    3-pentanol is heated with sulphuric acid (H2SO4) to become compound M. Compound M is reacted with Br2/ H2O to form Compound N. Outline the reaction step and name the compound M and N

    asked by aiman on August 14, 2015
  86. Physics

    An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

    asked by Dave on November 30, 2012
  87. Physics

    An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

    asked by Steve on December 1, 2012
  88. BIOLOGY

    Table Sugar can react with water to form 2 other compounds, glucose & fructose. But, when you add sugar to a glass of water the reaction is very slow - WHY? What would it need to speed it up?

    asked by JOHN on December 11, 2008
  89. calc volumes

    the basse of a solid S is the region enclosed by the graph of y=square root (ln x), the line x=e, and the x-axis. if the cross sections of S perpendicular to the x-axis are squares, then the volume of S is. how do i find the side of the squares. because i

    asked by david on December 5, 2006
  90. Calculus

    I was wondering if you would be able to check if my answers are correct: 1. An oil tank is being drained for cleaning. After t minutes there are v litres of oil left in the tank, where v(t)=40(20-t)^2, 00 (5/3+h)-(5/3)/h and my answer was 1/9. b) Determine

    asked by Sarah on April 10, 2014
  91. Thermodynamics

    A closed cycle gas turbine unit operating with max. And min. Temp. Of 760 and 20 Celsius deg has a pressure ratio of 7/1. Calculate the thermal efficiency and work ratio? Ans = 42.7 % , 0.505 My answers are : Efficiency 42.7 % which is correct.. but work

    asked by Akki on November 26, 2015
  92. Language Arts- Johnny Tremain

    Which of the following passages from the novel is most useful in helping you determine what type of ruler General Gage is? select all that apply. A)Sam Adams was so happy his hands shook worse than ever. B)He was not brilliant, but he was no tyrant. C)His

    asked by Channy-Boo on December 26, 2014
  93. Math

    A rectangular section of wilderness will be set aside as a new wildlife refuge. Its dimensions are 5 x 105meters by 4 x104 meters. Find the area of the land in square meters. Make sure your answer is in correct scientific notation form

    asked by ......... on May 1, 2019
  94. Science

    Any help on this I have to go to bed!!!! Help!!!! I can't find these answers anywhere and I don't have a science text book. 1. A tough outer covering that lies right outside the cel membrane. 2. A twisted membrane with portions that break off to form

    asked by Eryns on December 8, 2009
  95. Chemistry

    Chemistry help!!!!!!!!!!!? Make a chart and define the following reactions using the following 3 examples methods. Wrie out in letter(a,b,c), Symbol(Na,Cl,O) An name form(sodium,chloride,oxygen) A direct combination b decompition C single replacement and D

    asked by M on January 11, 2009
  96. writing

    Write a letter of complaint.Follow the rules for full-block style.The complaint may be about anything you wish (such as malfunctioning equipment,poor building maintenance,or disruptive noises form a nearby office.)You can make up all the details you need

    asked by marquetta on April 22, 2014
  97. Art

    How is graffiti typically used as an art form? Walls are painted to blend in with the surroundings History recorded in an open minded way Individuals express there social and political opinions*** Utilitarian art is crated two dimensions.

    asked by Shalee ^~^ on September 28, 2015
  98. CHEMISTRY

    WOULD YOU PLEASE SAY ME WHATWE USE ETHANOL IN SENTHESIS OF CU(NH3)4SO4.H2O I'm not sure. You don't say what kind of ethyl alcohol nor how you synthesized the copper salt; however, an educated guess is that you used absolute alcohol (100%) to form the

    asked by NAZANIN on May 6, 2007
  99. statistics

    For a certain group of individuals, the mean hemoglobin level in the blood is 21.0 grams per milliliter (g/ml). The standard deviation is 2 g/ml. If a sample of 25 individuals is selected, find the probability that the mean will be greater than 21.3 g/ml.

    asked by diandra on October 22, 2010
  100. History

    What was the main goal of the American Indian Movement? A)to achieve the right to form reservations B)to win greater rights for all Native Americans C)to establish a U.S. Bureau of Indian Affairs D)to overthrow the tribal government My choice B

    asked by Appreciated Help on September 29, 2015