B

Newest questions and responses by B
  1. PHYSICS

    a lump of lead with mass 0.50kg is dropped...

    asked on October 23, 2018
  2. math

    A recycling center pays 25 cents per aluminum can recycled at its facility. If Tracy recycles 5 aluminum cans there, how many dollars will she earn?

    asked on April 29, 2018
  3. Math

    6+4•5+3=80 insert grouping symbols so that the expression has the desired value

    asked on March 12, 2018
  4. Math

    Quadratic equations in problems: "The sides of a right triangle are (x+1)cm, (x+3)cm and (x+5)cm. find the length of each side." i need help asap

    asked on February 21, 2018
  5. Chem Oxidation-Reduction Titrations

    H2O2→ O2 + 2H+ + 2e- OCl- + 2H+ + 2e-→ H2O+ Cl- H2O2(aq) + OCl-(aq) → H2O(l) + Cl- (aq) + O2(g)Assign oxidation numbers to the following atoms: O in H2O2 ________; Cl in OCl- __________The oxidizing agent for this RedOx rxn is_____________. The

    asked on February 8, 2018
  6. Chem Oxidation-Reduction Titrations

    In our lab, the data consists of 1. Volume of NaOCl (mL): Trial 1= 10 ml & Trial 2= 10 mL. How can we find the concentration (Molarity), what would the calculated value be? 2. Volume of H2O2 (mL): Trial 1= 1/ml & Trial 2= 1/mL. How can we find the given

    asked on February 8, 2018
  7. Physics

    A brick that weighs 23 kg is laying on a table. The brick is retained. From the brick, a thread is connected via a castor to a weight with the mass of 19 kg. With how much force do the thread effect the hanging weight if you release the brick. Coefficient

    asked on October 8, 2017
  8. math, graphs

    the number of counselors must be 1/4 of the number of campers. write a rule for the number of counselors that must be at camp. wrote ordered pairs for the number of counselors when there are 76, 100, 120, and 168 campers.

    asked on October 5, 2017
  9. Math

    Calculate The Totale Surface Area And The Volume Of The Given Right Triangular Prism?

    asked on May 14, 2017
  10. Social Studies

    What was one effect of the Haymarket Riot? A) The influence of the American Federation of labor diminished B) The practice of collective-bargaining became more common C) Membership in the knights of labor grew rapidly *** D) Organized labor became less

    asked on March 6, 2017
  11. test and measures

    Suppose I want to use a test to help predict who will quit their jobs before the end of the three-month probation period. 100 new applicants are hired and the test is adminstered to all of them on the first day. Half of them quit before the end of the

    asked on January 27, 2017
  12. History

    Would someone please give some reputable sources for history of smallpox in Europe and China. I am writing a paper on it. My thesis is There are similarities in the devastation, experts and vaccination in the regions of both China and Europe as it relates

    asked on December 3, 2016
  13. Math

    600,000. = _ ten thousands

    asked on November 16, 2016
  14. physics

    a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You

    asked on October 9, 2016
  15. physics

    A 350N box is pulled along a horizontal pathway by a rope which makes an angle of 42degrees with the pathway. If a force of 250N is applied on the rope, what is the coefficient of sliding friction?

    asked on October 9, 2016
  16. physics

    Aljhumar is trying to arrange his room. He pushes an 80kg cabinet across the wooden room which resists the motion with a 300N force of friction. What is the coefficient of sliding friction between the cabinet and the floor?

    asked on October 9, 2016
  17. physics

    The coefficient of sliding friction between a 10kg rubber tire and wet concrete road is 0.43. Determine the time in which a moving object with a velocity of 35mi/h can come to a stop on the road. What distance is covered at this time?

    asked on October 9, 2016
  18. physics

    A 2.2kg bowling ball with a velocity of 2m/s rolls along a level floor for 30m before coming to a halt. What is the coefficient of rolling friction?

    asked on October 9, 2016
  19. math (stats)

    Enter your answers as decimals or fractions, rather than percents. In a family with 7 children what is the probability of having 4 boys and then 3 girls, in that order? (Exclude multiple births and assume all outcomes are equally likely). Preview In a

    asked on October 2, 2016
  20. math (stats)

    According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. [Round your answers to three decimal places, for example: 0.123] Compute the

    asked on October 2, 2016
  21. Chemistry

    How many grams of MgCl2 would be required to make 440 g of magnesium ? The other product is chlorine.

    asked on April 26, 2016
  22. European History, Modern History

    "Provide a thorough explanation of Hungary's impact on the communist bloc politically, and compare Hungary's situation to that of other Warsaw Pact members." I've decided to use the Revolution of 1956 and Goulash Communism as my examples, but I'm not sure

    asked on April 13, 2016
  23. Physics- Optics

    A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant

    asked on April 5, 2016
  24. Physics-Lens

    The focal length of your camera lens is 70mm. It is used for taking pictures of your friend who is 1.5m tall. What is your friends distance from the lens if the image just fills the 24mm vertical dimension of the film? I tried M=hi/ho=.16 .16=di-f/f

    asked on April 5, 2016
  25. Physics

    Blue light (λ vac= 440 nm) shines onto a puddle of water (n water = 1.33). There is a thin layer of oil (n = 1.47) on top of this water. What is the minimum thickness of the oil if there is constructive interference for the light? I tried 2t=(m+

    asked on April 5, 2016
  26. math

    a to the 3rd power divided by a to the 5th power?

    asked on February 15, 2016
  27. math-story prob

    Quinn is selling raffle tickets. The Ultra tickets cost $3 and the deluxe tickets cost $2. Quinn sold 89 tickets for $235. How many of each ticket did Quinn sell?

    asked on February 15, 2016
  28. math

    Need help to simply: 3x+2y=-18 -2x+5y=-26 Please help. Thanks

    asked on February 8, 2016
  29. math

    need to simply: 3x+2y=-18 -2x+5y=-26 Please help

    asked on February 8, 2016
  30. Math

    Please help: Jaylee wants to have a mural for her room. She has two bids: #1 Artist charges an initial fee of $79.50, plus $1 sq ft. Artist #2 does not charge a initial fee and charges $2.50 sq ft. Which size of mural(in sq ft) will be the same cost when

    asked on February 1, 2016
  31. math-story prob

    Please help: Jaylee wants to have a mural for her room. She has two bids: #1 Artist charges an initial fee of $79.50, plus $1 sq ft. Artist #2 does not charge a initial fee and charges $2.50 sq ft. Which size of mural(in sq ft) will be the same cost when

    asked on February 1, 2016
  32. math-story prob

    The total cost of gift baskets include the cost of each basket and a one time delivery fee. The cost of the basket is the same regardless of how many the customers orders. One company bought 40 baskets for a total of $715 and another company bought 400

    asked on January 25, 2016
  33. math-story prob

    Please help: The total cost of gift baskets include the cost of each basket and a one time delivery fee. One company bought 40 baskets for a total of $715 and another company bought 400 baskets for $5,935. What is the cost per basket? What is the cost for

    asked on January 25, 2016
  34. math-linear equations

    Its a story problem: The flying W Ranch raises only cows and horses. There are total 340 animals. The owner prefers horses to cows, so he has 52 more horses than cows. a. Write two different linear equations to model this situation. b. Solve the system of

    asked on January 19, 2016
  35. Math

    Please help me: I need an equation in slope intercept form when I know these values(-6,1) (-3,2). Do I have to do another equation first?

    asked on January 10, 2016
  36. math

    need an equation in slope intercept form when I know (-6,1) (-3,2)

    asked on January 10, 2016
  37. algebra

    School play tickets are $5.00 for none students and $3.00 for students. 937 ticket were sold for $3943.00 How many student tickets were sold and how many none student tickets were sold ?

    asked on December 13, 2015
  38. chemistry

    how many joules are needed to completely melt 25 grams of ice at 0 degree celcius?

    asked on December 6, 2015
  39. English

    How does the interaction between waverly develop over the course of the passage "rules of the game."

    asked on October 28, 2015
  40. chem

    If you maximize the unshared electrons in the boron atom, the electron configuration is? i know the electron configuration at ground state is 1S2 2S2 2P1 but when it maximizes unshared electrons i don't understand how it affects the configuration

    asked on August 24, 2015
  41. Biology

    What main region(s) of a peptide would be the major effectors of peptide folding?

    asked on August 24, 2015
  42. Chemistry

    Calculate the volume of solution that has a vapour pressure of 31.27 mbar and contains 84.3g of sucrose, at a temperature of 25.0C. The vapour pressure of pure water at 25.0C is 31.7mbar, the density of water is 1.00g/mL, and assume no change in volume

    asked on July 3, 2015
  43. Chemistry

    A 1.50 L buffer solution is 0.250 mol L-1 in HF and 0.250 mol L-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The Ka for HF is 3.5 × 10-4. Thanks in

    asked on June 21, 2015
  44. Chemistry

    1.3188g of antacid is weighed and mixed with 75.00mL of excess 0.1746M HCl. The excess acid required 27.20mL of 0.09767M of NaOH for back titration. Calculate the amount of CaCO3 in the tablet.

    asked on June 8, 2015
  45. algebra

    -2(x-3) 6x Is that the right answer?

    asked on May 25, 2015
  46. Algebra

    For the equation 9x^2+4y^2+54x-8y+49=0 determine the center, vertices and foci?

    asked on May 4, 2015
  47. Algebra

    Renee is twice as old as Dana. Four years ago Renee was three times as old as Dana. How old are Renee and Dana now? Show Work

    asked on April 27, 2015
  48. chemistry

    269 mL of a 0.2089 M sodium carbonate (Na2CO3) solution is prepared and labelled "Solution A".

    asked on March 22, 2015
  49. physics

    You have an RC circuit and you measure the "zero" voltage to actually be 2.385 [Volts]. The peak voltage is measured to be 8.262 [Volts]. At what voltage value will you look for t4 = time stamp for 15/16 total charge?

    asked on March 18, 2015
  50. Physics

    1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge?

    asked on March 10, 2015
  51. Physics help please!

    1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge? 2. Let's say you measure t1/2 to be 0.0137 seconds and the resistance in the circuit is 99 Ohms. Then what is the capacitance in micro Farads? 3.q = qmax(1 - e -t

    asked on March 10, 2015
  52. Math

    2+2=? Help?

    asked on February 24, 2015
  53. Science

    Describe the flow of blood in the human body, including through each of the four chambers of the heart. Explain how the blood changes as it moves through various locations in the body.

    asked on February 11, 2015
  54. problem

    Value Rent-A-Car rental a luxury car at a daily rate of $42.15 plus 50 cents per mile. A business person is allotted $130 for car rental each day. How many miles can the business person travel on the $130?

    asked on February 8, 2015
  55. chemistry

    Determine how many milliliters of 0.310 M HClO4 will be required to neutralize 52.37g Ca(OH)2 according to the reaction: 2HClO4 + Ca(OH)2 ---> Ca(ClO4)2 + 2 H2O

    asked on November 30, 2014
  56. Geometry

    Conic sections: Ellipse Show that the distance between the directrix and center is D1C = a/e. F1V1 + F1V2 = eD1V1 + eD1V2 2a = e(D1V1 + D1V2) = e(D1V1 + [D1V1 + V1V2]) = e(D1V1 + V1V2 + V2D2) = e(D1V1 + V1C + + CV2 + V2D2) = e([D1V1 + V1C] + [CV2 + V2D2])

    asked on November 9, 2014
  57. Algebra

    Belle is swimming in the lake and is 230 feet from shore. She starts to head back to shore at arate of 2ft/s. Ten seconds later, Max hops in a row boat and rows towards Belle at a rate of 5 ft/s. How many seconds will Bell have been swimming when Max

    asked on October 16, 2014
  58. Algebra

    A car leaves Denver at 30 km/h traveling south. Two hours later, another car leaves Denver traveling south at 40 km/ h. How many hours had the first car been traveling when the second car catches up?

    asked on October 16, 2014
  59. Algebra

    The length of a rectangle is 3 times the width. If the length is increased by 4 cm and the width is decreased by 1cm the parimeter will be 102 cm. find the dimensions of the original rectangle. I don't know the equation, please show the work. Not just the

    asked on October 16, 2014
  60. math factoring

    factor 2x^4+12x^3-18x^2-108x

    asked on October 5, 2014
  61. chemistry

    If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

    asked on September 28, 2014
  62. MATH

    How do i find the center of a circle using 3 points. Also need to find the radius and the equation of the circle.... My 3 points are (2,8) (-4,6) (1,-1) I found the Equation of the perpendicular bisector of the line between the first and second point which

    asked on September 25, 2014
  63. Please Help! Math

    How to find the center and radius of a circle using 3 points... My 3 points are (2,8) (-4,6) (1,-1) I found the Equation of the perpendicular bisector of the line between the first and second point which was y=(3/2)x + 5 And the Equation of the

    asked on September 25, 2014
  64. business

    . You've written a check to Goodwill Supply, and the check has been lost. What should you do? A. Stop payment on the first check; then write a second one. B. Send a counter check to Goodwill. C. Write another check immediately. D. Call Goodwill and tell

    asked on September 22, 2014
  65. office

    Which of the following organizations would most likely use an unabridged dictionary? A. The English department at a large university B. An automotive dealership C. A large retail department store D. A pediatrics hospita

    asked on September 19, 2014
  66. Algebra help

    Find an equation of the line L, where L is perpendicular to y=3x and passes through the point (1,3) Please help I'm not sure what formula to use or how to work out this problem

    asked on September 17, 2014
  67. Algebra

    Use a graphing utility to approximate the real solutions if any, of the given equation rounded to two decimal places. x^3-9x+1=0

    asked on September 17, 2014
  68. math

    Are the two solutions to x (2x+1) = 1 found by setting x = 1 and 2x + 1 = 1? Explain your reasoning. What are the solutions to this equation? Show how you arrived at your answer. Create an equation for your classmates to solve that requires factoring.

    asked on July 3, 2014
  69. aLGEBRA

    5/4X+7/12=1/3X-1/6

    asked on May 14, 2014
  70. math

    ABCD is a rectangle. If AC = 2(5a + 1) and BD = 2(a + 1), find the length of each diagonal.

    asked on May 9, 2014
  71. Chem.

    At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?

    asked on April 1, 2014
  72. English IV

    Help Please! Choose the function of the italicized infinitive phrase shown below. (stars indicate italicized infinitive phrase) Meridith is *to be restored as captain.* Answer Options: Function of infinitive: Adjective, Adverb, or Noun. (I chose adverb &

    asked on February 20, 2014
  73. Chemistry:Important!!!!!!!

    A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

    asked on February 10, 2014
  74. Finance

    The spot exchange rate for the Canadian dollar is Can $1.14 and the six-month forward rate is Can $1.17. Calculate whether a U.S. dollar or a Canadian dollar is worth more.

    asked on December 17, 2013
  75. chemistry

    Q2: A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?

    asked on December 8, 2013
  76. chemistry

    Q3: In the combustion reaction of 149g of propane(C3H8) with excess oxygen, what volume of carbon dioxide(CO2) is produced at STP? (note: balance the reaction first) C3H8 + O2  3CO2 + H2O

    asked on December 8, 2013
  77. chemistry

    Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both energy and gas bubbles to help clear the drain clog. The reaction is: 2NaOH + Al + 6H2O  2NaAl(OH)4 + 3H2 (note: balance the reaction

    asked on December 8, 2013
  78. algebra 2

    3x+3y

    asked on December 1, 2013
  79. mahs

    (2a+8b)

    asked on December 1, 2013
  80. chemistry

    What volume of carbon monoxide gas (at STP) is needed when 1.31 moles of oxygen gas react completely in the following equation? 2 CO + O2 --> 2 CO2

    asked on November 10, 2013
  81. chemistry

    What mass of ammonia is produced when 1.48 L of nitrogen (at STP) react completely in the following equation? N2 + 3H2 --> 2NH3

    asked on November 10, 2013
  82. BioChem

    In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that

    asked on October 30, 2013
  83. Biochem

    In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that

    asked on October 30, 2013
  84. Stats

    The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given

    asked on October 2, 2013
  85. fractions

    a recipe calls for 1/4 teaspoon of salt. to make three times the amount how much salt is needed?

    asked on September 24, 2013
  86. Precalculus

    Solve for a. a/a+5 - 2 = 3a/a+5

    asked on August 29, 2013
  87. Pre-Calculus

    How to write this conic section in standard form? 3y^2 = 108 - 12x^2

    asked on June 5, 2013
  88. Pre-Calculus

    How to write this conic section in standard form? 3y^2 = 108 - 12x^2

    asked on June 5, 2013
  89. chem

    a grocery store sells vinegar in 1Lbottles. based on your results, how many grams of acetic acid are in a bottle?

    asked on May 13, 2013
  90. math

    The buying and selling commission schedule shown below is from a well-known online discount brokerage firm.? Taking into consideration the buying and selling commissions in the schedule find annual rate of interest earned by each investment? Transaction

    asked on May 2, 2013
  91. Chemistry

    Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

    asked on April 19, 2013
  92. Chemistry

    Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

    asked on April 19, 2013
  93. Chemistry

    Calculate the [H+] for: black coffee with a pH of 6.9 (Enter your answer as follows: 1.0E-2 for 0.010)

    asked on April 19, 2013
  94. social studies

    How can you remember facts about the revolutionary war

    asked on April 16, 2013
  95. Chemistry

    How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

    asked on April 4, 2013
  96. Chemistry

    The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.

    asked on April 3, 2013
  97. Chemistry

    How many joules of energy are needed to change 275 g of water from 15°C to steam at 100.°C?

    asked on April 3, 2013
  98. Chemistry

    What is the hydroxide ion concentration of a 0.370M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1=5.6x10^-2 and Ka2=5.1x10^-5

    asked on March 19, 2013
  99. Chemistry

    What is the concentration of CO3^-2 in a 0.028M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11

    asked on March 19, 2013
  100. PHYSICS

    A bottle containing 4 kgof water at a temperature of 15°Cis placed in a refrigerator where the temperature is kept at 2°C.How much heat is transferred from the water to cool it to 2°C?

    asked on March 18, 2013

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