Danny

Popular questions and responses by Danny
  1. statistics

    A regression analysis between sales (in $1000) and advertising (in $100) resulted in the following least squares line: = 75 + 6x. This implies that if advertising is $800, then the predicted amount of sales (in dollars) is: A) $4875 B) $123,000 C) $487,500

    asked on August 18, 2009
  2. chemistry

    In the reaction below, ΔH°f is zero for ___________. Ni(s) + 2CO(g) + 2PF3(g) = Ni(CO)2(PF3)2(l) Ni(s) CO(g) Ni(CO)2(PF3)2(l) both CO(g) and PF3(g) PF3(g)

    asked on January 31, 2015
  3. Physics

    A merry-go-round is a common piece of playground equipment. A 2.4 m diameter merry-go-round with a mass of 300 kg is spinning at 22 rpm. John runs tangent to the merry-go-round at 5.0 m/s, in the same direction that it is turning, and jumps onto the outer

    asked on December 2, 2011
  4. chemistry

    The Ka of hypochlorous acid (HClO) is 3.00×10-8 at 25.0°C. Calculate the pH of a 0.0385 M hypochlorous acid solution. A.1.41 B.7.52 C.-1.41 D.4.47 E.8.94 I chose B

    asked on March 21, 2015
  5. Physics (Stress & Strain)

    A hole 3cm in diameter is to be punched out of a steel plate 8cm thick. The shear stress of the material is 670GPa. What load is required on the punch? 3cm = 0.03m 8cm = 0.08m Lateral surface area (As) = pi*D*h = 3.1416 * .03m * .08m = 3.1416 * .0024m =

    asked on June 26, 2013
  6. physics

    A highway curve with radius 1000ft is to be banked so that a car traveling 56.0mph will not skid sideways even in the absence of friction At what angle should the curve be banked?

    asked on March 9, 2015
  7. Algebra 2

    Amanda surveyed 20 juniors and seniors at Delamar high school to find the number of hours per week they spend working at part-time jobs. Her results are shown below. Juniors: 20,10,20,10,15,0,0,10,20,15 Seniors: 20,20,10,10,0,0,0,10,0,10 which statement

    asked on May 19, 2014
  8. Chemistry

    What is the symbol for an ion with 63 protons, 60 electrons, and 88 neutrons? If an ion contains 50 protons, 68 neutrons, and 48 electrons, what is its symbol? Please help me.. im soo lost in this problem!

    asked on July 24, 2008
  9. math

    The only defined term of those listed is: line angle plane point

    asked on April 13, 2011
  10. science

    A 5.0 kg model vehicle travelling at 14 m/s experiences a rocket boost of 85 N ( in the direction of motion) for 20 s What is the resulting speed? The answer is 350 but i don't know how to get to that answer

    asked on November 6, 2014
  11. chemistry

    What is the approximate effective nuclear charge for arsenic ?

    asked on April 27, 2015
  12. chemistry

    How many electrons does the Au+ ion have ? Enter an integer below without any letters or symbols.

    asked on April 15, 2015
  13. Calculus. I need help!

    Write the composite function in the form f(g(x)). [Identify the inner function u=g(x) and the outer function y=f(u).] Then find the derivative dy/dx. y=√sinx √ is square root.

    asked on February 25, 2012
  14. math

    If the radius of this cylinder is doubled, its volume will be twice as much four times as much eight times as much is it four times as much?

    asked on April 4, 2011
  15. chemistry

    At a certain elevation, the boiling point of water is 98.5°C. How much energy is needed to heat 35.0 mL of water to the boiling point at this elevation if the water initially was at 23.4°C? (Cp=75.38J/(mol*C), d= 1.00g/mL)

    asked on April 1, 2015
  16. Economics Macro

    Suppose that real GDP per capita in the United States is $49,000. If the long-term growth rate of real GDP per capita is 1.6% per year, how many years will it take for real GDP per capita to reach $98,000?

    asked on January 25, 2016
  17. chemistry

    Is the dissolution of borax in water a temperature dependent reaction or is it spontaneous at all temperatures at which water is liquid? I think its spontaneous at all temperatures when water is liquid because borax is a polar compound.

    asked on April 1, 2008
  18. Optics

    The famous Chinese magician Foo Ling Yu performs a classic magic trick using a concave mirror with a focal length of 1.6 m. Foo uses the mirror to produce an image of a light bulb that is the same size as the light bulb itself and is at the same location.

    asked on June 5, 2018
  19. Stress & Strain (Help Please)

    A tie bar is made of a material having a tensile strength of 231 MPa and has to carry a load of 255 kN. What id the diameter of the bar if a factor of safety of 7 is applied? ANS = 99.2 mm Cannot figure out how to get the answer. Need help please. Thank

    asked on August 10, 2013
  20. Velocity

    An object is thrown directly downwards from a height of 60m with an initial velocity of 11m/s. What will be its velocity on impact? v^2 = U^2 + 2as a= 9.81m/s^2 u = 11m/s s = 60m v^2 = 11m/s + 2 * 9.81m/s^2 * 60 = 1188.2m^2/s^2 = square root of

    asked on June 3, 2013
  21. chemistry

    The enthalpy change for the following reaction is -483.6 kJ: 2H2(g) + O2(g) = 2H2O(g) Therefore, the enthalpy change for the following reaction is _______ kJ: 4H2(g) + 2O2(g) = 4H2O(g)

    asked on January 31, 2015
  22. Physical Science

    Energy from the sun reaches Earth mostly by A. conduction. B. convection. C. radiation. D. thermal expansion. I think it's A.

    asked on September 3, 2013
  23. math

    Two similar polygons have areas of 16 square inches and 64 square inches. The ratio of a pair of corresponding sides is 1/4. True False its true?

    asked on April 6, 2011
  24. Physics

    A train traveling at a speed of 110 km/h uniformly decelerates for 20 seconds. During that time it travels 450m. A) What is the acceleration? (m/s^2) B) What is its speed after deceleration? (km/h) A ANS = -.805m/s^2 B ANS = 52km s = 450m t = 20 seconds u

    asked on January 11, 2014
  25. Physics

    Simple Machines A simple wheel and axle has a wheel diameter of 2.3m and an axle diameter of 92mm. If an effort of 26N is required to raise a mass of 16 kg what is the efficiency of the machine? A- 2.46% B- 95.3% C- 24.1% D- 20.1% E- 65.5% I am having a

    asked on May 11, 2013
  26. English 3

    Young Goodman Brown is a dynamic character TRUE OR FALSE

    asked on November 7, 2012
  27. ENGLISH Types of business writing

    Assume that you’ve worked for the last five years as an administrative assistant for the Human Resources Department of Broadworth General Hospital. The Director of Human Resources, Miriam Hopkins, has charged you with organizing a two-hour training

    asked on April 2, 2012
  28. physics

    A 100-kg crate, sliding on the floor, is brought to a stop by a 25-n force. What is the deceleration of the crate?

    asked on March 20, 2009
  29. Pre-Calculus

    A hemispherical bowl with a 30-centimeter radius contains some water, which is 12 centimeters deep. Find the volume of the water.

    asked on October 10, 2016
  30. chemistry

    Consider an electrochemical cell based on the reaction: 2H+(aq) + Sn(s) = Sn2+(aq) + H2(g). Which of the following actions would NOT change the measured cell potential? lowering the pH in the cathode compartment addition of more tin metal to the anode

    asked on April 19, 2015
  31. chemistry

    Which element is reduced in the unbalanced reaction below? I− + MnO4− + H+ = I2 + MnO2 + H2O I no reduction occurred in this reaction O H Mn

    asked on April 16, 2015
  32. physics

    A 55 kg hiker starts at an elevation of 1600 m and climbs to the top of a 3400 m peak. (a) What is the hiker's change in potential energy?

    asked on July 9, 2012
  33. ENGLISH Types of business writing

    Assume that you’ve worked for the last five years as an administrative assistant for the Human Resources Department of Broadworth General Hospital. The Director of Human Resources, Miriam Hopkins, has charged you with organizing a two-hour training

    asked on April 4, 2012
  34. Math

    Radio stations use three or four letters for their call letters(name). The first letter must be a W or K. How many different call letters are possible if repeated letters are allowed? And not allowed?

    asked on March 29, 2013
  35. math-true/false

    An isometry preserves distance. True False true?

    asked on April 11, 2011
  36. Math

    An equilateral triangle s divided into 4 congruent equilateral triangles. What method can be used to find the area of the larger equilaterl triangle give the area of one of the smaller triangles? F. Multiply the area of the larger equilateral triangle by 4

    asked on December 7, 2010
  37. english

    The first European novel is generally considered to be _____. Pamela Robinson Crusoe Gulliver's Travels Don Quixote Silas Marner

    asked on November 9, 2010
  38. english

    "He manages to portray tiny, random events as significant without the occasionally overblown melodrama . . . " so im suppose to Read the quote and choose its category. but i don't no what to do? these are my answer choices.. -universality -subject matter

    asked on October 28, 2010
  39. Chemistry

    5F2(g) + 2NH3(g) ==> N2F4(g) + 6HF(g) a)If you have 66.6 g NH3, how many grams of F2 are required for complete reaction? b)How many grams of NH3 are required to produce 4.65g HF? c)How many grams of N2F4 can be produced from 225g F2?

    asked on April 5, 2010
  40. Calculus

    A plane flying with a constant speed of 24 km/min passes over a ground radar station at an altitude of 8 km and climbs at an angle of 20 degrees. At what rate, in km/min, is the distance from the plane to the radar station increasing 2 minutes later?

    asked on March 1, 2010
  41. math

    3cos^2(theta)-3=5sin(theta)-2

    asked on June 11, 2019
  42. chemistry

    Which of the following acids is expected to be the strongest acid? CH2F-COOH CF3-COOH CH3-COOH CCl3-COOH CBr3-COOH i chose ccl3-cooh

    asked on March 21, 2015
  43. chemistry

    One of the ways to produce iron is to take iron(II) oxide and react it with carbon monoxide to get pure iron and carbon dioxide. The reaction is FeO(s) + CO(g) = Fe(s) + CO2(g). What is the partial pressure of CO2(g) if 2.00 atm of CO and excess iron(II)

    asked on February 28, 2015
  44. physics

    21. A traffic signal of mass 25.0 kg is suspended by two cables as shown in the diagram below. Solve for the tension in each cable each of the following scenarios: (a) θ1 = θ2 = 20.0°, and (b) θ1 = 20.0°, θ2 = 30.0°.

    asked on February 17, 2015
  45. Physical Science

    The primary colors of pigments A. are cyan, yellow, and magenta. B. are the same as the secondary colors of light. C. combine in equal amounts to produce black. D. all of the above I think it's D.

    asked on September 4, 2013
  46. Physics (Stress & Strain)

    What is the factor of safety of a steel hanger having an ultimate strength of 550.000MPa and supporting a load of 79000.000N. The steel hanger in question has a cross sectional area of 7.000cm^2. ANS = (Round to 3 decimal places) ultimate strength =

    asked on June 27, 2013
  47. Physics (Stress & Strain)

    What is the factor of safety for a steel hanger having an ultimate strength of 70000N per cm^2 and supporting a load of 87500N. The hanger has a cross sectional area of 5cm^2. Factor of safety = ultimate stress/ allowable stress = 70000/87500 = 0.8 Have I

    asked on June 24, 2013
  48. Physics

    Camera lenses are described in terms of their focal length. A 50.0 mm lens has a focal length of 50.0 mm (a) A camera with a 50 mm lens is focused on an object 4.0 m away. Locate the image. (b) A 980 mm lens is focused on an object 125 m away. Locate the

    asked on May 21, 2013
  49. math

    A steel tube has an outside diameter of 15 cm, an inside diameter of 13 cm,and is 3.7 m long. What is the volume of the steel contained in the tube in cubic cm is?

    asked on April 19, 2013
  50. science

    Zinc chloride solution is poured into a solution of ammonium carbonate. need conventional, ionic and net ionic equations thanks

    asked on March 12, 2013
  51. Physics

    If the specific volume of red brass is 0.001865 ft/3lb. What would be the density? Thanks!

    asked on February 1, 2013
  52. math

    What is the angle sum of a regular polygon with 7 sides

    asked on August 30, 2012
  53. ENGLISH: types of business writing

    Draft an email of at least four complete sentences to Deb Walker the designated trainer: Confirm the arrangements for the seminar providing only the information she needs to arrive at the right place at the right time. Copy both to Mr, Dittmer and Ms.

    asked on April 4, 2012
  54. algebra

    a handful of coins is worth $1.50. there are a total of 54 pennies and quartes in the hand

    asked on May 16, 2011
  55. Algebra 1

    a farmer raises chickens and cows. there are 34 animals in all. the farmer counts 110 legs total on these animals. how many chickens and how many cows are on this farm?

    asked on May 16, 2011
  56. math true/false

    All diagonals from a single vertex of a hexagon are drawn. Four triangles will result. True False true?

    asked on April 13, 2011
  57. math

    A square has symmetry with respect to a line containing a median of the square. True False true?

    asked on April 7, 2011
  58. math

    When chords intersect in a circle, the vertical angles formed intercept congruent arcs. always sometimes never

    asked on January 6, 2011
  59. english

    When the theaters reopened, the age of Restoration drama began. true?

    asked on November 11, 2010
  60. english

    "The editors . . . break those sequences up into quick jagged shots that key us up and keep us hyper-alert . . . we look hard at the screen to take it in." universality?

    asked on October 29, 2010
  61. Physics

    Richard is driving home to visit his parents. 125 of the trip are on the interstate highway where the speed limit is 65 . Normally Richard drives at the speed limit, but today he is running late and decides to take his chances by driving at 70. How many

    asked on September 16, 2010
  62. Chemistry

    The equation for the complete combustion of ethene (C2H4) is C2H4(g) + 3 O2(g) ==> 2CO2(g) + 2H2O(g) If 2.70 mol C2H4 is reacted with 6.30 mole O2, identify the limiting reagent. show all work.

    asked on March 27, 2010
  63. ELA

    In Sitton Spelling and Word Skills Practice Book, What is the answers antonyms: after less south remember against tall unimportant import evening backward unusual disorganized rebel periphery temporary latter Synonyms: change assist deficit revive

    asked on April 19, 2017
  64. math

    Sarah Meeham blends coffee for Tasi-Delight. She needs to prepare 140 pounds for blended coffee beans selling for $5.07 per pound. She plans to do this by blending together a high-quality bean costing $6.50 per pound and a cheaper bean at $2.50 per pound.

    asked on July 14, 2015
  65. chemistry

    Consider an electrochemical cell based on the reaction: 2H+(aq) + Sn(s) = Sn2+(aq) + H2(g). Which of the following actions would NOT change the measured cell potential? lowering the pH in the cathode compartment addition of more tin metal to the anode

    asked on April 16, 2015
  66. Calculus Physics

    Imagine a spaceship on its way to the moon from the earth. Find the point, as measured from the center of the earth, where the force of gravity due to the earth is balanced exactly by the gravity of the moon. This point lies on a line between the centers

    asked on March 2, 2015
  67. chemistry

    Suppose you have the following reaction at equilibrium: N2(g) + 3H2(g) = 2NH3(g), ΔH = −22 kcal/mol What changes are expected to occur if the temperature of the system was decreased. You may select multiple answers. The concentration of NH3(g) would

    asked on February 25, 2015
  68. chemistry

    1) C2H2O4(aq) = H+ (aq) + C2HO4- (aq); Keq = 6.5E-2 2) C2O42- (aq) + H+ (aq) = C2HO4- (aq); Keq = 1.64E+4 then what is the equilibrium constant for the following reaction: C2H2O4(aq) = 2H+ (aq) + C2O42- (aq)? Keq = 1070 Keq = 227 Keq = 2.21E-4 Keq =

    asked on February 25, 2015
  69. chemistry

    The pollutant NO is formed in diesel engines. The reaction fixes atmospheric nitrogen with oxygen to form NO. The reaction is: N2(g) + O2(g) = 2NO(g). If the equilibrium constant for this reaction at elevated temperatures is 5.60E-11, then what is the

    asked on February 25, 2015
  70. chemistry

    How is the reaction quotient used to determine whether a system is at equilibrium? The reaction is at equilibrium when Q > Keq. At equilibrium, the reaction quotient is undefined. The reaction quotient must be satisfied for equilibrium to be achieved. The

    asked on February 25, 2015
  71. chemistry

    Which of the following statements is not true? 1.Chemical equilibria are examples of reversible processes. 2.When multiple reaction steps are in equilibrium, then the equilibrium constant for the net reaction is the product of the individual reactions.

    asked on February 25, 2015
  72. chemistry

    ΔS is positive for which one of the following reactions? Ag+(aq) + Cl- (aq) = AgCl(s) N2(g) + 3H2(g) = 2NH3(g) CaO(s) + CO2(g) = CaCO3(s) 2SO3(g) = 2SO2(g) + O2(g) H2O(l) = H2O(s)

    asked on February 7, 2015
  73. chemistry

    How many core electrons are there in a ground state phosphorus atom?

    asked on February 3, 2015
  74. chemistry

    Given: Equation #1: 4NH3(g) + 5O2(g) = 4NO(g) + 6H2O; ΔH of reaction = -1170 kJ Equation #2: 4NH3(g) + 3O2(g) = 2N2(g) + 6H2O; ΔH of reaction = -1530 kJ Then what is the ΔH of reaction for: N2(g) + O2(g) = 2NO(g)? Enter a numerical value below and be

    asked on January 31, 2015
  75. chemistry

    Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for: CaC2(s) + 2H2O(l) = Ca(OH)2(s) + C2H2(g) is -127 kJ, then what is the enthalpy of formation for calcium carbide? The ΔH of formation for

    asked on January 31, 2015
  76. chem

    The value for ΔH° for the reaction below is -72 kJ. How many kJ of heat are released when 1.0 mol of HBr is formed in this reaction? H2(g) + Br2(l) = 2HBr(g)

    asked on January 28, 2015
  77. Chemistry

    Calculate the pH of a solution in which a. [H3O+] = 7.8 x 10-7 M pH = b. [H3O+] = 5.1 x 10-6 M pH = c. [H3O+] = 6.1 x 10-5 M pH = d. [H3O+] = 9.3 x 10-4 M pH = I get 8.1 9.5 9.1 6.7 but its wrong please someone help!

    asked on March 19, 2014
  78. Math

    A spring is 25 cm long when stretched. The spring was stretched by 18% of its original length. Determine the original length.

    asked on December 21, 2013
  79. grammar

    Which part of speech is the capitalized words in this sentence? Four score and seven years ago our fathers brought forth on this continent, a NEW nation, conceived in Liberty, and DEDICATED to the proposition that all men are created equal. Now we are

    asked on November 17, 2013
  80. Physical Science

    If no friction acts on a diver during a dive, then which of the following statements is true? A. The total mechanical energy of the system increases. B. Potential energy can be converted into kinetic energy but not vice versa. C. (KE+ PE)beginning = (KE +

    asked on September 3, 2013
  81. Physics (Stress & Strain)

    A uniform bar 1.900 meters in length and having a cross sectional area of 11.000cm^2 is subject to a loading of 5450.000 Newtons. this load causes an extension to the bar length of 2.420mm. Calculate the stress and strain produced. 11cm = .11m 2.420mm =

    asked on June 26, 2013
  82. Physics (Stress & Strain)

    A hole 3cm in diameter is to be punched out of a steel plate 8cm thick. The shear stress of the material is 670GPa. What load is required on the punch? First find the area: A = pi*d^2/ 2 = 3.1416 * 3cm^2/ 2 = 3.1416 * 9/ 2 = 28.2744/ 2 = 7.0686cm Stress =

    asked on June 24, 2013
  83. Physics (Stress & Strain)

    A uniform bar 1.900m in length and having a cross sectional area of 10.500cm^2 is subject to a loading of 5550.000N. This load causes an extension of the bar length of 1.100mm. Calculate the stress and strain produced. Stress = Load/ Area Strain = Change

    asked on June 23, 2013
  84. college algebra

    An open box is made from a square piece of cardboard 20 inches on a side by cutting identical squares from the corners and turning up the sides.(a) Express the volume of the box, V , as a function of the length of the side of the square cut from each

    asked on September 27, 2012
  85. Algebra II

    A cowboy is practicing his lassoing technique by lassoing the fence posts at his ranch. Consider that is lariat forms a perecly elliptical shape centered at the origin while he twirls it. If the fence posts are 2 inches in circumference and the cowboy

    asked on May 23, 2012
  86. ENGLISH : Types of business writing

    Assume that you’ve worked for the last five years as an administrative assistant for the Human Resources Department of Broadworth General Hospital. The Director of Human Resources, Miriam Hopkins, has charged you with organizing a two-hour training

    asked on April 3, 2012
  87. Physics

    A 340 g bird flying along at 6.0 m/s sees a 14 g insect heading straight toward it with a speed of 30 m/s. The bird opens its mouth wide and enjoys a nice lunch. What is the bird's speed immediately after swallowing?

    asked on November 29, 2011
  88. english

    What kind of plays did Euripides write? allegories tragedies comedies miracle plays mystery plays morality play

    asked on November 17, 2010
  89. englsih

    Expanding the Canon . . . tends to drive out the better writers, sometimes even the best, because pragmatically none of us (whoever we are) ever had time to read absolutely everything . . . inadequate authors will consume the energies that would be better

    asked on October 28, 2010
  90. Chemistry

    How many mL of 0.225M HCl would be required to titrate 6.00 grams of KOH?

    asked on March 25, 2010
  91. global

    Why would so many women miners prefer to work in the mines without clothing? Why did the women need the heavy belts around their waists and chains between their legs?

    asked on February 24, 2010
  92. Physic

    A 2.2 m-long string is fixed at both ends and tightened until the wave speed is 50 m/s. What is the frequency of the standing wave shown in the figure? Answer in Hz. I've been working on it for a while but cant figure out...

    asked on November 7, 2009
  93. How do i do this maths question??

    A sector of a circle with radius r cm contains an angle of θ radians between the bounding radii. Given that the perimeter of the sector is 7cm, express θ in terms of r and show that the area is r/2(7-2r)cm square. Hence, find the maximum area of this

    asked on June 19, 2009
  94. chem

    Would you expect jewelry made of an alloy of silver and copper to tarnish(react) in an environment where chlorine fumes exist? Why or why not? Im assuming yes because both silver and copper metals react with chlorine gas...I don't know if I am correct in

    asked on March 18, 2009
  95. accounting

    estimating inventory and preparing multiple step and single step income statement

    asked on October 16, 2008
  96. Ethics

    What information about race and ethnicity in the United States has helped you better understand or relate to specific minority groups? Have you learned something new about your own cultural history? Trends in immigration will continue to shape the face of

    asked on November 20, 2007
  97. Math

    If the hypotenuse is 41 inches and one of the legs are 40 inches how long is the other??

    asked on January 7, 2020
  98. geography

    did the french ever go down to mexico with the spanish

    asked on June 11, 2019
  99. Math

    Show using integration by parts that: e^3x sin(2x)dx = 4/26 e^3x (3/2 sin(2x) - cos(2x)) +c Bit stuck on this. Using rule f udv = uv - f vdu u = e^3x dv + sin(2x)dx f dv = v du/dx = 3e^3x v = -1/2 cos(2x) so uv - f vdu: = (e^3x)(-1/2 cos(2x)) - (-1/2

    asked on March 24, 2016
  100. Physics

    A 6.80 x 10^4 kg space shuttle moving at 7.90 x 10^4 m/s reenters the earth's atmosphere 80.0 km above the earth's surface. What is the shuttle's total mechanical energy with respect to earth's surface? I know the answer is E= 2.173 x 10^12J But I don't

    asked on January 27, 2016

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