Most popular questions and responses by mike
  1. chemistry

    For a particular isomer of C8H18, the following reaction produces 5113.3 kJ of heat per mole of C8H18(g) consumed, under standard conditions. C8H18(g) + 25/2(O2)(g) -> 8CO2(g) + 9H2O(g) DeltaH= -5113.3 kJ What is the standard enthalpy of formation of this

    asked on January 29, 2012
  2. Math

    Write a function rule that represents the sentence. C is 8 more than half of n. c=8+n/2****** c+8=n/2 c+8=1/2+n c=n/2-8

    asked on October 25, 2015
  3. English

    In “A Sound of Thunder,” Travis’s dialogue with Lesperance reveals how upset he is about Eckels’ having left the path. This is an example of direct characterization.******** indirect characterization.

    asked on November 2, 2015
  4. calculus

    A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume that no clay is lost in the process. Suppose the height of the cylinder is increasing by 0.5

    asked on March 31, 2013
  5. Math

    Two fire towers are 30 kilometers apart, tower A being due west of tower B. A fire is spotted from the towers, and the bearings from A and B are E 14 degrees N and W 34 degrees N, respectively. Find the distance d of the fire from the line segment AB.

    asked on May 10, 2011
  6. Math

    The time t required to drive a certain distance varies inversely with the speed r. If it takes 4 hours to drive the distance at 35 miles per hour, how long will it take to drive the same distance at 45 miles per hour? about 3.11 hours********* 140 hours

    asked on May 11, 2016
  7. English

    Identify the sentence in which the underlined verb does not agree with its subject. Everyone on the team (works) together well. Both of them (are looking) forward to the field trip. Neither of the boys is (excited) about playing football. One of the girls

    asked on May 19, 2016
  8. Algebra

    Which is the degree measure of an angle whose tangent is 5.67? Round the answer to the nearest whole number.

    asked on May 19, 2014
  9. English

    True or false: Shakespeare’s works were written to be performed on stage. true************* false

    asked on February 16, 2016
  10. English/Language Arts

    Which of the following parenthetical citations is placed and punctuated correctly? A)The only casualty on Lewis and Clark's trip died from appendicitis (Davis 104). B)(Davis, 104) Kenneth Davis explains that the only casualty on Lewis and Clark's trip died

    asked on May 19, 2016
  11. Physics

    Question: The amount of internal energy needed to raise the temperature of .25 kg of water by 0.2 degrees Celsius is 209.3 J. How fast must a 0.25 kg baseball travel in order for its kinetic energy to equal this internal energy? KE = (.5)(m)(v^2) 209.3 J =

    asked on February 15, 2010
  12. English

    Read the following quote from Betty Bonham Lies’s retelling of the myth of Orpheus and Eurydice. When Orpheus made music, all the world stopped to listen. Wild beasts drew near him, so entranced they put aside their fierceness. Trees gathered around to

    asked on May 18, 2016
  13. chemistry

    calculate the change in pH when 9.00ml of 0.100M HCl(aq) is added to 100.0mL of a buffer solution that is 0.100M in NH3(aq) and 0.100M NH4Cl(aq). ...Calculate the change in pH when 9.00,L if 0.100M NaOH(aq) is added to the original buffer solution.

    asked on October 28, 2012
  14. english

    Use at least five adverbs and five adjectives to write a brief review of a movie, sporting event, musical performance, or television show. · Bold each adverb. · Underline each adjective. · Compare the event to one or more similar events. When comparing,

    asked on August 14, 2011
  15. Foreign languages

    I urgently need you to check these sentences, too. Thank you. 1) Pay in cash (or pay cash?) 2) Have you ever tried shopping on line OR online shopping? 3) They are planning to open a shopping centre on the edge/on the outskirts of town. 3) Imagine to dance

    asked on June 19, 2012
  16. Physics

    A wooden block of mass m = 9 kg starts from rest on an inclined plane sloped at an angle θ from the horizontal. The block is originally located 5m from the bottom of the plane. If the block, undergoing constant acceleration down the ramp, slides to the

    asked on February 3, 2013
  17. covalent or ionic bond

    Is Mercury (ii) Chloride a covalent bond or ionic?

    asked on May 4, 2009
  18. Math

    A beam tests against a wall, forming a 50 degrees with the floor. Use the function y=9 sec 0 to find the length of the beam to the nearest tenth of a foot. 14.0 ft 11.7 ft 5.8 ft 6.9 B?

    asked on May 19, 2014
  19. English

    Which of the following is a complete sentence? Never make the same mistake twice. Working on a project that was overdue. One of my friends, who writes beautiful poetry in his spare time. A brand new housing complex full of beautiful parks and

    asked on December 29, 2015
  20. science

    (a) Find the concentration of H+, HCO3 - and CO3 2-, in a 0.01M solution of carbonic acid if the pH of this is 4.18. Ka1(H2CO3)=4.45 10–7 andKa2 =4.69 10–11 (b).Calculate the pH at the equivalence point of the titration between 0.1M CH3- COOH ( 25 ml)

    asked on April 16, 2019
  21. physics

    A car traveling 95 km/h slows down at a constant 0.80 m/s^2 just by "letting up on the gas. A) Calculate the distance it travels during the second second. B) Calculate the distance it travels during ninth second.

    asked on July 8, 2011
  22. Calculus - Need help please

    Given the following​ function, y=tan(pi-3x) 1)determine the interval for the principal cycle. (^ Type your answer in interval notation) 2)Then for the principal​ cycle, determine the equations of the vertical​ asymptotes 3)find the coordinates of the

    asked on August 4, 2016
  23. Math

    A cube has edge lengths of 5cm each. The cube weighs 0.54 kg. What is its specific weight

    asked on September 4, 2016
  24. world history

    Which civilizations were likely to have contact with each other?Why? _answer: Indus valley and Shang because they are close geographically B)Between which lines of latitude did early civilizations develop? Why? _Between lines of 20N and 40N. Because at

    asked on September 5, 2011
  25. calculus

    A conical water tank with vertex down has a radius of 12 feet at the top and is 23 feet high. If water flows into the tank at a rate of 20 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 17 feet deep?

    asked on November 30, 2012
  26. physics

    Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in the front of the car. In the event of an impact, the passenger compartment decelerates

    asked on October 2, 2010
  27. english

    2. The broadest type of search, which looks for your terms anywhere, is a/an _______ search. A. subject B. title C. author D. keyword

    asked on November 3, 2012
  28. ***PLEASE SCIENCE****

    I have this question: Which is the smallest unit of measurement for temperature? One Celsius degree: one Kelvin:one Fahrenheit. I think it is Kelvin but I can't find anywhere in my book where it refers to that. When I google all three it says Celsius &

    asked on October 10, 2012
  29. Calculus, AntiDerivatives

    I need help with this problem: A car traveling at 43 ft/sec decelerates at a constant 5 ft per second squared. How many feet does the car travel before coming to a complete stop? I'm not sure where to start, i know how to find antiDerivatives, but i don't

    asked on November 23, 2006
  30. Physics

    A spring is hung from the ceiling. When a coffee mug is attached to its end, it stretches 3.0 cm before reaching its new equilibrium length. The block is then pulled down slightly and released. What is the frequency of oscillation?

    asked on November 30, 2010
  31. Social studies

    7. why were there fewer slaves in the backcountry of the southern colonies than those areas closer to the coast Colonists in the backcountry were primarily self sufficient Backcountry colonists were fundamentally opposed to slavery Colonists in the

    asked on September 14, 2016
  32. Physics

    A 25 kg child bounces on a pogo stick. The pogo stick has a spring with spring constant 2.0*10^4 N/m. When the child makes a nice big bounce, he finds that at the bottom of the bounce he is accelerating upwards at 9.8 m/s^2. How much is the spring

    asked on November 6, 2010
  33. Calculus Maxima/Minima

    An automobile traveling at the rate of 30 ft/sec is approaching an intersection. When the automobile is 120 ft. from the intersection, a truck, traveling at the rate of 40 ft/sec on a road at right angles with the automobile’s road crosses the

    asked on September 28, 2014
  34. American Gov.

    In holt vs hobbs what did the supreme court use as a basis for its decision? a. Holt was not a member of a recognized religion. b. the government was preventing Holt from practicing his religion. c. The prison had a compelling interest in facilitating

    asked on November 2, 2016
  35. chemistry

    In a particular redox reaction, Cr is oxidized to CrO4^2– and Cu2^+ is reduced to Cu^+ . Complete and balance the equation for this reaction in acidic solution. Cr + Cu^2+ ---> CrO4^2-+ Cu^+ i started off by doing this 2 x SO3^2- ---> SO4^2- + 2e 2 x

    asked on February 13, 2012
  36. Algebra

    Find the correct table of values for the following function:y = x – 3 x y 10 8 8 6 6 4 x y 10 13 8 11 6 9 x y 10 7 8 5 6 3 x y******************** 10 3 8 3 6 3

    asked on January 8, 2016
  37. chemistry

    Gaseous butane CH3CH22CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . Suppose 36.0 g of butane is mixed with 41. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical

    asked on September 21, 2015
  38. Calculus

    The demand function for the Luminar desk lamp is given by the following function where x is the quantity demanded in thousands and p is the unit price in dollars. p = f(x) = -0.1x2 - 0.3x + 39 (a) Find f '(x). f '(x) = (b) What is the rate of change of the

    asked on June 13, 2013
  39. English/Language Arts

    A _____ includes all the works a writer used in the actual report, including direct quotes. footnote bibliography Works Cited page********** parenthetical citation

    asked on May 19, 2016
  40. Algebra

    Find the slope for the following line: y = 3/4x-7 -7**************** 7 3/4 -4/3

    asked on January 11, 2016
  41. Chem

    Consider the balanced chemical equation: 3Sr(OH)2(aq) + 2H3PO4(aq) → Sr3(PO4)2(s) + 6H2O(l). How many moles of Sr(OH)2 remain if 0.10 mol of H3PO4 react with 0.40 mol of Sr(OH)2?

    asked on August 20, 2011
  42. Algebra

    City Highest Lowest Elevetion(ft) elevation(ft) Long Beach,Ca. 360 -7 New Orleans,Ca. 25 -8 1. The table shows the highest and lowest elevetions for two cities. A. Find the range of elevetions for Long Beach. B. Find the range of elevations for New

    asked on September 2, 2015
  43. Calculus check my answers

    1. The general solution of the differential equation dy - 0.2x dx = 0 is a family of curves. These curves are all: a. lines b. hyperbolas c. parabolas (my answer) d. ellipses 2. The table below gives selected values for the function f(x). Use a trapezoidal

    asked on July 2, 2018
  44. Social Studies

    Which two of the following are examples of Spanish influence on Albuquerque? The Spanish founded the village of Albuquerque. The annual hot air balloon festival came from a Spanish tradition. Most of Albuquerque's current buildings were built during the

    asked on October 25, 2015
  45. geometry


    asked on August 30, 2011
  46. Math

    Megan's dog Sparky eats 4 1/4 c of food each day. Explain how Megan can determine how much food to give Sparky if she needs to feed him only 2/3 as much. Solve the problem.

    asked on February 6, 2014
  47. geometry

    A 4​-ft vertical post casts a 20​-in shadow at the same time a nearby cell phone tower casts a 115​-ft shadow. How tall is the cell phone​ tower?

    asked on June 5, 2017
  48. Chemistry

    For the reaction C2H4Br2+ 3KI>C2H4+2KBr+KI3, when the rate of reaction is 2.0x10^-5, what is the rate of disappearance of KI?

    asked on September 17, 2016
  49. Basic Math

    Bill and Sue both work at night. Bill has every sixth night off and Sue has every eighth night off. If they are both off tonight, how many nights will it be before they are both off again?

    asked on January 31, 2011
  50. Chemistry Help

    The ΔHvap of a certain compound is 34.68 kJ·mol–1 and its ΔSvap is 93.60 J·mol–1·K–1. What it the boiling point of this compound?

    asked on February 10, 2013
  51. Physics

    A 5000 kg African elephant has a resting metabolic rate of 2500 W. On a hot day, the elephant's environment is likely to be nearly the same temperature as the animal itself, so cooling by radiation is not effective. The only plausible way to keep cool is

    asked on January 3, 2013
  52. physics help please

    a horizontal force of 8.0 newtons is used to pull a 20.-newton wooden box moving toward the right along a horizantal, wood surface, as shown. A. Determine the mass of the box. B. calculate the magnitude of the acceleration of the box.[Show all work,

    asked on November 28, 2010
  53. Physics

    a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 212 m. If the red car has a constant velocity of 23.0 km/h, the cars pass each other at x =

    asked on March 29, 2015
  54. Math

    Put the function P= 35(1.3)^t in the form P0ekt When written in this form, you have: K= P0=

    asked on August 28, 2012
  55. Financial Management

    TLB EXHIBIT 1 SUMMARY OUTPUT Regression Statistics Multiple R 0.397871332 R Square 0.158301597 Adjusted R Square 0.146771482 Standard Error 0.099101922 Observations 75 ANOVA df SS MS F Significance F Regression 1 0.134839089 0.134839089 13.72940301

    asked on April 14, 2009
  56. math

    there are 9 candidates running for 3 seats....how many different election results are possible

    asked on April 22, 2013
  57. MATH

    Misu Sheet, owner of the Bedspread Shop, knows his customers will pay no more than $110 for a comforter. Misu Sheet wants to advertise the comforter as "percent markup on cost." a. What is the equivalent rate of percent markup on cost compared to the 30%

    asked on February 16, 2014
  58. English grammar check please

    If someone could check these sentences for me that would be great. sentence beginning with a present participle: Beginning with Tom's conviction, Jem's belief in justice and the basic good of humanity is badly damaged. sentence that begins with a past

    asked on April 4, 2009
  59. physics

    Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the tops of towers. Suppose a siren produces a sound that has an intensity level of 120 dB at a distance of 2.0 m. How far away can the siren be heard?

    asked on June 3, 2012
  60. Algebra

    You improve your time running a course by 5 seconds in week one, by 3 seconds in week two, and by 4 seconds in week three. What is the average weekly change in your running time? Can anyone help me with this problem pls.. Thanks

    asked on September 15, 2015
  61. physics

    A 2.5 kg block of ice at a temperature of 0.0 degrees Celcius and an initial speed of 5.7 m/s slides across a level floor. If 3.3 x 10^5 J are required to melt 1.0 kg of ice, how much ice melts, assuming that the initial kinetic energy of the ice block is

    asked on February 15, 2010
  62. Chemistry

    Why are some solutes soluble in water, but others are soluble in cyclohexane?

    asked on November 16, 2017
  63. pre-calc

    A Ferris wheel is 50 meters in diameter and boarded from a platform that is 4 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 8 minutes. How many minutes of

    asked on March 22, 2018
  64. Chemistry check Please

    The question is: Find the following quantities the volume, in liters, of 835 g SO3 at STP My answer is: 1 mol of SO3=80g 835g/80g = 10.44 mols v = (10.44 x 8.314 x 273)/100 = 236 L Can someone tell me if I did it correct. Thanks very much.

    asked on March 9, 2009
  65. Science

    Which of earth's spheres contains mountains,valley's, and other landscapes?

    asked on February 9, 2017
  66. PHYSICS 2

    An electron in an x-ray machine is accelerated through a potential difference of 1x10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?

    asked on June 30, 2013
  67. Maths - Algebra

    Boxes are made by cutting 8cm squares from the corners of sheets of cardboard and then folding. The sheets of cardboard are 6cm lnbger than they are wide. width of sheet= x length of sheet = x+6 length of finished box = (x-10) width of finished box =

    asked on November 12, 2011
  68. maths

    a car weighing 1600kg moving with a velocity of 30 meter per second retarded uniformly coming to rest in 20 seconds calculate 1, initial momentum 2, final momentum 3, rate of change of momentum 4,acceleration of the car 5, magnitude of the force apply

    asked on January 28, 2016
  69. Math

    The toco toucan, the largest member of the toucan family, possesses the largest beak relative to body size of all birds. This exaggerated feature has received various interpretations, such as being a refined adaptation for feeding. However, the large

    asked on February 8, 2018
  70. Chemistry

    For which of the following aqueous salts will electrolysis produce hydrogen gas and oxygen gas? Answered the hint in Mastering Chem & looked over the book and I still have no idea. Check all that apply: A) NiF_2(aq) B) NaF(aq) C) NiI_2(aq) D) NaI(aq) E)

    asked on November 8, 2012
  71. English

    Which literary device is used in the following sentence? “Marie worked all day like an ant getting ready for the winter.” alliteration metaphor************** simile rhyme scheme

    asked on December 29, 2015
  72. Math Please Help Quick

    The probability of winning a game is 20%. If you play 20 times, how many times should you expect to win?

    asked on June 2, 2016
  73. Calculus

    Let f(x) = 4x5/4 + 10x3/2 + 9x. Find the following. (a) f '(0) = (b) f '(16) =

    asked on June 13, 2013
  74. Physics

    The oven draws 1100W of power, and you have determined that it heats with an efficiency of 51%. Using this information, determine the time t it would take to bring 240mL of water from 25C to 100C . Note that 4.2 J of energy is required to raise the

    asked on December 10, 2010
  75. chemistry

    A 100 g sample of an unknown liquid absorbs 2000 J of heat energy, raising the liquid’s temperature from 50 ◦ C to 70 ◦ C . What is the specific heat capacity of this liquid? No phase change took place.

    asked on December 17, 2012
  76. Math-college

    Find an​ nth-degree polynomial function with real coefficients satisfying the given conditions. n=4; i and 3 i are zero; f(-2)=65 f(x)= An expression using x as the variable. Simplify your​ answer.

    asked on July 25, 2017
  77. Math

    Which measure correctly completes that statement? 3,271.5 milligrams=?grams A.0.032715 ML B.5,388.26 ML**** C.538.826 ML D.53,882,600 ML

    asked on March 27, 2018
  78. Social Studies

    Which person would benefit most from the policies of the Carlsbad Irrigation District? a construction investor in Roswell a Navajo in northwestern New Mexico a businessperson in Albuquerque a farmer in southeastern New Mexico*******

    asked on October 25, 2015
  79. Social Studies

    Which statement best summarizes the National Reclamation Act of 1902? The National Register of Historic Places began building dams. The first dams opened on the Pecos River. Navajos and non-Navajos reached an agreement about water rights.+++++++++++++ The

    asked on October 15, 2015
  80. Physics- torque

    A man ties one end of a strong rope 8.35 m long to the bumper of his truck, 0.506 m from the ground, and the other end to a vertical tree trunk at a height of 3.92 m. He uses the truck to create a tension of 8.32x10^2 N in the rope. Compute the magnitude

    asked on November 18, 2013
  81. Physics

    A 52kg ice hockey player moving at 11m/s slows down and stops over a displacement os 8.0m. Calculate the net force of the skater.

    asked on May 3, 2012
  82. General Physics

    During heavy rain, a section of a mountainside measuring 2.5 km horizontally, 0.80 km up along the slope, and 2.0m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 0.40km

    asked on August 21, 2010
  83. physics

    A small, m = 2.00 g plastic ball is suspended by a L = 25.0 cm long string in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a 14.0° angle with the vertical as indicated, what is the net charge

    asked on October 5, 2010
  84. Social Studies

    What was the National Reclamation Act of 1902 mostly concerned with? national parks land conservation********* water management military bases

    asked on October 25, 2015
  85. Chemistry

    Assuming equal concentrations, rank these aqueous solutions by their freezing point: low to high NH4Cl, Sn(ClO3)4, Na2SO4, and AlBr3.

    asked on May 4, 2013
  86. Science

    The air pressure on Pikes Peak in Colorado is approximately 600 millibars. What is the relationship between air pressure at the top of Pikes Peak and at sea level, where air pressure is 1013 millibars?

    asked on June 10, 2014
  87. Physics

    A 0.40-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 2.0-m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75-N, what is the maximum speed the ball can have?

    asked on June 14, 2012
  88. Chem

    3O2(g)---> 2O3(g) At a given instant, the reaction rate in terms of [O2] is 2.17x10^-5 mol/L*s. What is it in terms of O3?

    asked on April 6, 2010
  89. AP Chemistry

    A biochemist prepares a lactic acid-lactate buffer by mixing 225 mL of 0.85M lactic acid with a Ka=1.38*10^-4 with 435mL of 0.68M sodium lactate. What is the buffer pH? I know I have to use the equilibrium constant expression, but I'm pretty lost from

    asked on March 16, 2013
  90. cHEM

    It is found that 1.431 g of element X contains 7.509 × 1021 atoms. The atomic mass of X is?

    asked on March 14, 2013
  91. spanish

    We sing a song entitled He drinks tequila,and she talks dirty in spanish ^ there are a couple of phrases that I don't know the meaning of could you help please. the first is "a brasa mi puerta" The second is "to dal ay nochay" I hope this is not offensive

    asked on November 21, 2009
  92. Chemistry

    At a total atmospheric pressure of 1.00 atm, the partial pressure of CO2 in air is approximately 4.0×10−4 atm. If at 20 ∘C and a partial pressure of 760 mmHg, the solubility of CO2 in water is 0.169 g/100mL, what is the solubility of CO2 in an open

    asked on December 5, 2014
  93. physics

    Two point charges of +30μC and -10μC are separated by a distance of 10cm. What is the magnitude of electric field due to these charges at a point midway between them? (k = 9 × 109 N · m2/C2)

    asked on September 10, 2015
  94. Physics

    A train slows down as it rounds a sharp horizontal turn, going from 90 km/h to 54 km/h in the 15.0 it takes to round the bend. Compute the acceleration at the moment the train reaches 50.0 km/h. Assume the train continues to slow down at this time in the

    asked on October 24, 2017
  95. Chemistry

    Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 10.4-g sample of CaCl2 is dissolved in 102 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the

    asked on April 18, 2013
  96. Science

    The combustion of methane in a laboratory burner is represented by the following equation: CH4 + 2 O2 > CO2 + 2 H2O Given the following three thermochemical equations: C + H2 > CH4 H=-74.87kJ C + O2 > CO2 H= -393.5 2 H2 + O2 > 2 H2O H=-571.6 a) Determine

    asked on July 9, 2015
  97. Chemistry

    What mass of MgSO4 · 7H2O is required to prepare 800 mL of a 0.442MMgSO4 solution? Answer in units of g. Would you use the formula M1V1=M2V2?

    asked on October 11, 2010
  98. physics

    A 1600 kg car traveling at a speed of 31 m/s skids to a halt on wet concrete where uk = 0.60. how long are the skid marks?

    asked on October 2, 2010
  99. Physics

    What is the magnitude of the electric field at a point midway between a -5.1 microC and a +6.1 microC charge 10cm apart? Assume no other charges are nearby. What is the direction of the electric field?

    asked on January 27, 2012
  100. physics

    An object is launched horizontally from a cliff. The cliff is 80m high and the object has an initial velocity of 50m/s. Find the initial x and y velocity and the final x and y velocity

    asked on October 2, 2012


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