Questions Asked on
June 16, 2011

  1. Chemistry

    Part A Calculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol) A -263 B -391 C +203 D -523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART B----THIS ONE I NEED

  2. Physics

    The launching mechanism of a toy gun consists of a spring of unknown spring constant, as shown in Figure P5.33a. If its spring is compressed a distance of 0.140 m and the gun fired vertically as shown, the gun can launch a 24.0 g projectile to a maximum

  3. Math

    Solve: sin2xsinx - cos2xcosx = 1, x domain [-pi, pi].

  4. math

    a pair of dice is rolled. is the event of rolling a sum of the dice is an odd number. Find the probability that the sum is a five or a ten, given that an odd sum is rolled.

  5. physics

    A room is 13 ft. It needs to be painted. The ceiling is 8 ft above the floor. there are two windows int he room, each one is 3 ft by 4 ft. The door is 2.5 ft by 6.5 ft. What is the area of the wall and ceiling? 1 gallon of paint covers 64.37sq ft. How many

  6. chemistry

    how do you calculate the normal boiling point of PCl3

  7. Physics

    1) A particle travels between two parallel vertical walls separated by 16 m. It moves toward the opposing wall at a constant rate of 6.4 m/s. It hits the opposite wall at the same height. The acceleration of gravity is 9.8 m/s. a) What will be its speed

  8. pre-algebra

    Convert 21/40 to a percent.

  9. Physics

    Two 0.33 kg blocks are attached to a 1.62m long string such that the lengths of the three string segments are equal. The ends of the string are attached to the ceiling at points separated by 1m. Each segment is 0.54m long. What is the tension in the

  10. physics

    A particle travels to the right at a constant rate of 6.5 m/s. It suddenly is given a vertical acceleration of 3.2 m/s2 for 3.9 s. What is its direction of travel after the acceleration with respect to the horizontal? Answer between −180 and +180.

  11. Chemistry

    Please help me verify: The following reactions are involved in the formation of acid rain. Use oxidation numbers to identify which of these reactions are REDOX reactions. a. 2SO2(g) + O2(g) �� 2SO2(g) -2 -2 0 -2 -2 No change - not REDOX

  12. chemistry

    What volume does 627 cm3 of a gas at 14°C occupy at 40°C, if the pressure does not change?

  13. College

    A room is 13 ft. It needs to be painted. The ceiling is 8 ft above the floor. there are two windows int he room, each one is 3 ft by 4 ft. The door is 2.5 ft by 6.5 ft. What is the area of the wall and ceiling? 1 gallon of paint covers 64.37sq ft. How many

  14. Criminology

    What future research directions of crime do you find most interesting, and why? I have done a web search and can't seem to get the ball rolling. Any help would be greatly appreciated.

  15. chemistry

    Calculate the quantity of heat gained or lost: a) 3.50 mol H2O freezes at 0.0 oC b) 0.44 mol of steam condenses at 100 oC

  16. physics

    a bus takes 8 hours to cover a distance of 320km what is the average speed of the bus?

  17. physical education

    What is Pele, the King of Soccer doing these days? Is he still alive? Is a soccer player in Brazil? What does he do these days? Is he a coach? I'd like to know what Pele is doing these days? Thank you.

  18. Geometry

    Triangle DEF is an isosceles triangle with DE = FE. If DE = 5 and ÚD = 75 degrees: what is the length of FE, the measure of angle F, and the measure of angle E? E D ∆ F

  19. Science(Chemsitry)

    HNO3 used as a reagent has specific gravity of 1.42g/ml and contains 70% by strength HNO3. Calculate a)Normality Of Acid b)Volume of acid that contains 63g pure acid c)Volume of water required to make 1N solution from 2ml conc.HNO3

  20. physics

    A length of wire carrying a current i and bent into a circular coil of one turn.The same length of wire has been out to give a coil of 5 turns, each of 1\5 the original radius.If Ba and Bb are the magnitudes of the magnetic fields at the centers of the two

  21. physics

    A mass is suspended on a spring scale. The scale shows a reading of 5N and stretches a distance of 0.2 meters from its relaxed length. 1)What is the spring constant of the scale? )If this scale was taken to a planet that has a mass 4 times larger than the

  22. novel studies

    in the book the cay list three precautionary things that timothy does just before the storm hits the cay?

  23. math-G.P and A.P

    A) which down the first G.P exceed 400000? B) in an A.P,the sum of the first five term is 30, and the third term is equal to the sum of the first two. Write the first five terms of the progression.

  24. Grade 12 University physics

    A 1.2kg block is dropped from 48cm above a spring in equilibrium. The force constant for the spring is 124N/m. Calculate the maximum compression in the spring.

  25. English

    Identify the sentence with the correct word choice. a) Let's divide the work among the three of us. b) Let's divide the work between the three of us. c) Let’s divide the work amongst the two of us. d) Let’s divide the work betweens the three of us.

  26. english III

    Write your own journal entry from the perspective of a member of Bradford's colony. What do you think of these unruly pirates? What shocks you the most about these surly characters? How do the manners of the pirates differ from yours?

  27. Math

    Solve the systems using substitution. 1.6x + 2y = -2 4x + y = 1

  28. quantum chemistry or physics

    How can I solve the following exercise: Use perturbation theory to calculate the energy levels of a particle in a box with a cosine function botto. Let the box extend from x=0 to x=a and let the perturbing potential be H' = V0[1+cos(2*Pi*m*x/a)]. This

  29. English

    Can you please check the word choice and let me know which expressions sound better? (The parts in parentheses) Thank you! 3)I couldn’t believe people could eat the meat of animals such as crocodiles or zebras. (I couldn't believe my eyes when I saw

  30. math

    Find the solution where x and y are integers to: 1/x + 1/y = 1/14 I can use a computer to get a list of solutions: 7, -14 10, -35 12, -84 13, -182 15, -210 16, 112 18, 63 21, 42 28, 28 but I'm having trouble solving this analytically and coming to a

  31. Physics

    Two 0.33 kg blocks are attached to a 1.62m long string such that the lengths of the three string segments are equal. The ends of the string are attached to the ceiling at points separated by 1m. Each segment is 0.54m long. (If drawn, it will form a

  32. english

    Each child will want one of those. is one a pronoun or adj? I think it is a adjective

  33. math

    You pick a card from a card deck of 52 cards. If you choose a diamond or a heart, you win $50. If you choose a club or a spade, you lose $60. Find the expected value of this game.

  34. Implicit (calculus)

    Can someone explain implicit differentiation to me like I am a kindergarten? I am not getting it. Any hints to help me understand better?

  35. Marketing

    Marketing Plan: Your company has just developed a new sports drink that is in a container which will keep it cool for up to 6 hours

  36. computer science

    Input a list of positive numbers (terminated by 0) into an array, find the mean (average) of the numbers in the array, and output the result. Use a subprogram to input the numbers, a function to find the mean, and a subprogram to output the result.

  37. geometry

    What two quadrilaterals can you make with two lines that are 8 in. and two lines that are 5in.

  38. american history

    The West African nation of Liberia was founded under the auspices of

  39. ETH/125

    I am having a hard time finding credible sources that support or oppose bilingual education. I also need sources that support or oppose bilingualism in politics. Please help Student website has been down and this assignment is due at midnight

  40. algebra

    Tom played five rounds of golf and shot an average score of 72. If he excluded the lowest score, however, his average for the other four rounds was 74. what was Tom's lowest score in the five rounds? PLEASE EXPLAIN HOW

  41. Math

    How do I graph .4x + y = 325,000

  42. Please help

    if andres was born january 13 he would be how many days old today?

  43. BEH/225


  44. physics

    Physics: maximum force that can be applied to move an object? What is the maximum force F which can be exerted? Given: The friction between the block with mass 14 kg and the wedge with mass 16 kg is 0.19 . The surface between the wedge with mass 16 kg and

  45. English

    Can you identify key qualities of drama and poetry which emphasize their performative qualities.

  46. Please help

    if andres was born january 13 2010 how many days would he be?

  47. biology

    What is a possible system that can be used to test respiration in a small animal?

  48. calculus

    find the equation of the tangent line to y=4^((x^2)-6x+3) at x=4

  49. mathw

    a pair of dice is rolled. find the probability that the sum of the dice is an odd number. also, find the probability that the sum is a 5 or 10 given that an odd sum is rolled

  50. English

    Could you please check these statements, please? It's really urgent. 1)How are the flowers introduced in the first stanza of William Wordsworth’s poem “Daffodils”? What view of nature is presented in the poem? 2) Briefly outline the relationship

  51. math

    A pair of dice is rolled. Is the event of rolling a sum of 2, 4, 6, or 8 independent from rolling a sum of 3, 5, 7, or 9?

  52. math

    Solve using the substitution method. If the system has no solution or an infinite number of solutions, state this. -2x + 0y = -14 x + 11y = 18

  53. English

    Would I say the Chicago White Sox rules or rule? Why?

  54. Chemistry

    How many milliliters of a 2.5 hydrochloric acid solution would be needed to react completely with 32.0 grams of magnesium metal

  55. computer

    describe two ways to troubleshoot a PC connection that has lost contact with the network

  56. Math

    Find the following probability if z is a standard normal variable: P(z>1.62).

  57. chemistry

    How much heat flows from 20kg of 90 degrees water placed in contact with 20kg of 10 degrees water, producing a final temperature of 50 degrees? c=4186j/kgC

  58. business

    a 200- to 300-word description of a business scenario, either real or fictional, that depicts each of the following forms of business organization

  59. Algebra

    a boy 4 ft tall casts a shadow 6 ft long. he stands next to a monument that has a 52 ft long shadow. how tall is the monument?

  60. algebra

    if the length of a triangle is 31 find a new parameter if the width is 5 less than one half the length

  61. Physics

    A ball initially moving at 0.5m/s rolls down a straight slope, accelerating at 0.25m/s^2 for 4 sec, how far does the ball travel in this time?

  62. Algebra

    you start a pet sitting service. you spend $35 on advertising. You plan to change $5 on a day to watch each pet. a) write an equation to relate your daily income y to the number of pets x you watch. b) how many days do you need to watch a pet to pay for

  63. physics

    A train slows down at a constant rate as it rounds a sharp circular horizontal turn. Its initial speed is not known. It takes 19.8 s to slow down from 81 km/h to 37 km/h. The radius of the curve is 164 m. As the train goes around the turn, what is the

  64. Algebra

    As CEO of a company, you notice that your five executives have the following salaries: $85,000, $91,000, $70,000, $70,000, $62,000. You are hiring a sixth executive. Which measure of central tendency would be the most attractive to people applying for the

  65. Chemistry

    Analyze the properties of a sodium atom and a sodium ion. What are the differences in mass, stability, and reactivity that are caused due to the differences between the sodium atom and sodium ion?

  66. Algebra

    James has saved $50. He wants to buy a DVD player for $149 in about 5 months. To find out how much he should save each week he wrote 50+20x=149. Explain his equation.

  67. Chemistry

    A freshman is currently enjoying the Arts Studio program she is pursuing at a well-known university. In her free time, she likes to skate, take salsa dance lessons, and cook. She particularly enjoys pickling and decides to pickle olives over a leisurely

  68. Algebra

    James has saved $50. He wants to buy a DVD player for $149 in about 5 months. To find out how much he should save each week he wrote 50+20x=149. Explain his equation.

  69. english

    Can someone please tell me how this paragraph would be rated? Literary technique paragraph using the second paragraph of the Jan 2011 regent. In passage 2, the author Marge Piercy uses similie to portray the hard work people he loves best do. Similes

  70. math

    is the pair of lines parallel x+2y=7 and 2x+4y=3

  71. Math

    Hi I have a sample question for a math assessment that I wanted to ask about: What number is expressed by (9 x 6) -s- 3? a 18 b 27 c 6 d 21 Which of these answers is right and what is "s" suppose to mean? Is S like some sort of fixed value?

  72. social studies

    When was there a time through 1863 that the Confederates had a strong chance of winning the Civil War..?

  73. Reading

    Poem "A Voice," By Pat Mora How do you interpret the speaker's statement that her mother's breath "moves through the family like the wind moves through the trees

  74. calculus

    evaluate dx/8+2x^2

  75. Mat 116 Algebra 1A

    7[3m-(m+2)]>-6(m+3) Use set-builder notation to describe the complete solution {m|m > ? } (type an equality symbol; then type an integer or a simplified fraction.)

  76. novel studies

    in the book the cay what happen to timothy when he gets that "devil, d'fever"?

  77. math

    what would be the change in water speed going from an opening of 10ft height by 25ft width into a tube 5ft height by 18ft width if the water was traveling at 1.2mph?

  78. Maths

    What is the answer for these questions:- 1) Indefinite Integrals gcx) = (8 + 39x ^ 3) / x 2) Indefinite Integrals hcu) = sin ^2 (1/8 u) 3) Evaluate x ( 8 - 5 x ^2) dx Thank you

  79. math

    the value of a rare dime is expected to increase according to the equation, y=25x+10, wherer y is the value of the coin (in cents) after x years a)state the slope of the line and interperate its meaning b) state the y-intercept of the line and interperate

  80. Chemistry

    please verify my answer: Consider the following REDOX reaction: Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) a. Write the oxidation and reduction half-cell reactions. Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) +2 +4 +2 +4 Zn(s)->Zn2+(aq)+2e-

  81. financial management

    The HighT Company is a manufacturer of electronic products. The company is preparing a financial plan for the coming year and has the following independent projects under consideration: Project Initial investment ($ millions) Internal rate of return (%) A

  82. Reading

    Mary Olivers poem the journey explain the decision that the "you" in the poem made, and whether or not you think it was the right decision. I don't understand what their trying to say

  83. Chemistry

    What weight of glycerol C3H5(OH)3 molar mass is 92 would have been add to 1000g of water in order to lower the freezing point

  84. Chemistry

    What weight of glycerol C3H5(OH)3 molar mass is 92 would have been add to 1000g of water in order to lower the freezing point

  85. English - Native speakers

    Hello! I know articles are really complicated in English language but what is the easiest way to explain the usage of definite, indefinite and zero article?

  86. calculus

    find the tangent to y=27/(x^2+2) at (1,9)

  87. chemistry

    how many milliliters of hydrogen at 0 degree C and 1400 mmhg are produced if 15g of magnesium reacts with sulfuric acid?

  88. psyc 106

    A newspaper iditorialist argues that the use of dsm-iv diagnostic labels is destructively antidemocratic, because it enables an elite ccorps of mental health professionals to subtle control the values and life-styles of the rest of the society. i need

  89. science

    1. An object 5 millimeters high is located 15 millimeters in front of a plane mirror. How far from the mirror is the image located? A. 5.0 millimeters B. 7.5 millimeters C. 15 millimeters D. 30 millimeters

  90. chemistry

    how much heat is needed to bring 90.0 grams of aluminum from 25 to 75 degrees celcius?

  91. chemistry

    Each 375 mL of an orange drink contains 3.0 grams of protein. In order to consume 11 grams of protein, how many mL would you have to drink? Give your answer in mL to the nearest whole number.

  92. science

    Sarah needs to replace part of the metal railing on her deck and wants the new railing to match the existing railing. However, she does not know what metal the railing is made from. Which is a property that she can use to identify the metal?

  93. alg II

    How do you solve this equation

  94. intermediate algebra

    a jacket that used to cost $84 now costs $70. what is the percent decrease?

  95. alg II

    how do you solve this equation 2 cos pi x = 4x + 5

  96. intermediate algebra

    7/30= 49/x !!!???? thx

  97. Understanding policy development

    Dye (2008) argued “Federalism often creates confusion over which lever of government has the responsibility of handling crises” (p. 290). Discuss the issues associated with federalism and what local, state, and federal policy makers need to consider

  98. Chemistry

    What is a cathode and an anode? In the formula for table salt: NaCl, which part of the compound is a cathode and which part is the anode? ****** I don't get any of this stuff!?! D: Due tomorrow!! ))):

  99. math

    In 2000,the population of Arizona was 5 million and growing continuously at a rate of 3.1% per year. Write a function f that models Arizona's population in millions x years after 2000.

  100. intermediate algebra

    50x^8 y^8/25x^4 y2 + 28x^7 y^6/14^3

  101. physiology

    Given a Helium-Neon laser-based fiber optic Doppler probe at an angle of 60¡C with a blood vessel that registers a frequency shift of 63KHz, what is the velocity of the blood? Is this a reasonable number from a physiologic point of view when compared to

  102. Chemistry

    What transitional metal might be suitable to manufacture indestructible spectacle frames: Explain your choice.

  103. algebra


  104. Chemistry

    Why is iron not used to make surgical and other knives: Explain your reasons.

  105. algebra


  106. intermediate algebra

    50x^8 y^8/25x^4 y2 + 28x^7 y^6/14^3

  107. chemistry

    what products would be formed if glycerol were combusted? wright a balanced equation for the combuntion reaction of glycerol (C3,H8,O3).

  108. Organic chemistry

    2- butanol + 2-pentanoic acid

  109. Medical Coding

    four steps that should be followed to ensure accuate icd coding

  110. math

    How to find the GCD

  111. english

    I really need someone to write me a short formal letter of complaint that presents a problem and suggests a solution. Please help!!

  112. physics

    A car goes at a constant velocity of 15 m/sec for 4 seconds. How far does the car go in that time?

  113. geometry

    If the base equals 11 and the height equals 11 the radius is 3.14 What is the rounded to the nearest hole number?

  114. chemistry

    How many molecules are in 0.495 mole of lactic acid?

  115. pre-algebra

    Convert 0.75% to a decimal

  116. pre-algebra

    What is 648% of 734?

  117. pre-algebra

    41.772 is 70.8% of what number?

  118. pre-algebra

    What percent of 125 is 72.9%?

  119. geology

    WHat are the geologic principles associated with the issue of subsidence from water pumping?

  120. bus 210

    create a 10 - 15 slide microsoft. power point presentation describing the evolution of business

  121. chemistry

    Determine the mass of NaCl present needed to prepare 500mL of 4.0%m/v solution. Please show me how to set up problem

  122. cultural diversity ETH125

    o o According to research and news reports within the past 10 years, what are some of the changes the United States has made to policies concerning the treatment of Muslim and Arabic members of society? I DO NOT GET THIS QUESTION AT ALL. IT DOES NOT MAKE

  123. Chemistry

    Part A Calculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol) A -263 B -391 C +203 D -523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART B----THIS ONE I NEED

  124. government

    Each British colony was governed according to a _____, a written agreement between the settlers and the Crown laying down the colony's basic rules of government.

  125. English

    Can you please check the following sentences? It is really urgent. Thank you very much. 1) Last summer I went to South Africa with my family. In my opinion, it was the most exciting holiday I have ever had. 2) Actually, South Africa has got a lot of wild

  126. english

    Our class had a test in Spanish this afternoon. find the nouns mark concrete or abstract class concrete test concrete spanish concrete afternoon concrete?

  127. math

    what is the missing numerator for 2/9and18

  128. english

    Tom could see the anger on Mr. Adams' face. nouns contrete or abstract Tom concrete anger abstract face concrete is this correct?

  129. english

    Lori and her friends went to a movie on the Fourth of July. identify the collective and compound nouns friends collective Fourth of July compound did i miss any? ty

  130. Math Statistics

    (46,500 – 47,000)/[5500/sqrt(30)]=