Popular questions and responses by julie
  1. math

    The volume of a pyramid varies jointly with the base area of the pyramid and its height. The volume of one pyramid is 24 cubic inches when its base area is 24 square inches and its height is 3 inches. What is the volume of a pyramid with a base area of 10

    asked on November 15, 2014
  2. chemistry 105

    Lithium reacts with nitrogen gas according to the following reaction: 6Li(s)+N2(g)-->2LiN(s) What mass of lithium (in g ) is required to react completely with 59.9 mL of N2 gas at STP?

    asked on October 23, 2011
  3. chem

    How many moles of carbon are needed to react with 525 g of hematite 2FeO3+6C->4Fe+3Co2 idk how to convert moles of fe2o3 to carbon

    asked on September 29, 2013
  4. chemistry

    Consider the following system, which is at equilibrium, 3C(s) + 3 H2(g) mc020-1.jpg CH4(g) + C2H2(g) The result of removing some C(s) from the system is that a) more CH4(g) and C2H2(g) are produced to replace that which is removed. b) Kc decreases. c) more

    asked on May 11, 2014
  5. Chemistry

    Suppose you titrated a sample of distilled water with EDTA, approximately what volume of EDTA would be required?

    asked on October 1, 2012
  6. physics help please...

    A light spring of constant k = 170 N/m rests vertically on the bottom of a large beaker of water. A 5.70 kg block of wood (density = 650 kg/m3) is connected to the spring and the mass-spring system is allowed to come to static equilibrium. What is the

    asked on December 20, 2010
  7. Physical Science

    How many meters away is a cliff if an echo is heard 0.500 s after the original sound? Assume that sound traveled at 343 m/s on that day.

    asked on March 6, 2010
  8. math

    A company begins a radio advertising campaign in Chicago to market a new soft drink. The percentage of the target market that buys a soft drink is estimated by the function f(t)=100(1-e^-0.01t), where t is the number of days of the campaign. After how long

    asked on April 24, 2012
  9. Math

    Isaac throws an apple straight up (in the positive direction) from 1.0 m above the ground, reaching a maximum height of 35 meters. Neglecting air resistance, what is the ball’s velocity when it hits the ground?

    asked on April 18, 2016
  10. Chemistry

    Calculate E, E^o and (delta)G^o for the following cell reaction: Mg(s) + Sn2+(aq) (yields) Mg2+(aq) + Sn(s) [Mg2+] = 0.045 M, [Sn2+] = 0.035 M

    asked on May 11, 2010
  11. physics

    A passenger on an interplanetary express bus traveling at = 0.95 takes a 9.0-minute catnap, according to her watch.How long does her catnap from the vantage point of a fixed planet last?

    asked on August 10, 2012
  12. Economics

    got this from my teacher, A monopolist faces a demand curve given by the following equation: P = $500 − 10Q, where Q equals quantity sold per day. Its marginal cost curve is MC = $100 per day. Assume that the firm faces no fixed cost. and have the

    asked on May 7, 2013
  13. physic

    a resistor has a voltage of 6.65 V and a current of 4.45 A. it is placed in a calorimeter containing 200g of water at 24 degree Celsius. the calorimeter is aluminum (specific heat= 0.220 cal/g-Celsius), and its mass is 60g. the heat capacity of the

    asked on February 26, 2013
  14. Chemistry

    Given that E^o = 0.52 V for the reduction of Cu+(aq) + e - (yields) Cu(s) Calculate E^o, (delta)G^o and K for the following reaction at 25°C. 2Cu2+(aq) (yields) Cu2+(aq) + Cu(s)

    asked on May 11, 2010
  15. Chemistry 105

    Use the molar volume of a gas at STP to calculate the density (in g/L ) of carbon dioxide gas at STP.

    asked on October 23, 2011
  16. physics

    A hot iron horseshoe (mass = 0.43 kg), just forged (Fig. 14-16), is dropped into 1.60 L of water in a 0.26 kg iron pot initially at 20°C. If the final equilibrium temperature is 26°C, estimate the initial temperature of the hot horseshoe. Could someone

    asked on April 23, 2012
  17. Math

    The length of a rectangle is 8 cm longer than its width , if the perimeter is 84 cm , what is its area

    asked on January 20, 2016
  18. geometry

    What's the next number 360, 180, 60, 15...?

    asked on March 20, 2012
  19. English

    A topic sentence should be very long. 1. True 2. False Please recheck my answer. I say True

    asked on July 16, 2016
  20. statistics

    A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. State the hypotheses to test whether the mean transaction time exceeds 50 seconds.

    asked on October 5, 2010
  21. Physics

    Monochromatic light of wavelength, λ is traveling in air. The light then strikes a thin film having an index of refraction n1 that is coating a material having an index of refraction n2. If n2 is larger than n1, what minimum film thickness will result in

    asked on August 6, 2015
  22. chemistry

    What is the is product of Nickel(II) nitrate+sodium phosphate This is what I have: Ni(NO3)2+Na3PO4----> can you help me on the resultant equation please

    asked on January 8, 2008
  23. math

    the needle of the scale in bulk food section of a supermarket is 25 cm long. find the distance when the needle rotates 50 degrees

    asked on February 6, 2011
  24. Physics

    A baseball thrown at an angle of 55.0 degrees above the horizontal strikes a building 16.0 m away at a point 8.00 m above the point from which it is thrown. Ignore air resistance. Find the magnitude of the initial velocity of the baseball (the velocity

    asked on September 19, 2006
  25. Math

    a student answered 86 problems on a test and got a 98%. How many problems were on the test?

    asked on November 21, 2016
  26. chemistry

    So I did a titration lab at school with NaOH and HCl. i have to find: - volume used, NaOH - Moles of NaOH - Moles of HCl -Volume used unknown HCl - Molarity of HCl solution My concentration of NaOH stock solution was 0.100 mol/lL Final buret reading, NaOH:

    asked on January 4, 2015
  27. Chemistry 105

    Ozone is depleted in the stratosphere by chlorine from CF3Cl according to the following set of equations: CF3Cl+UV light-->CF3+Cl Cl+O3-->ClO+O2 O3+UV light-->O2+O ClO+O-->Cl+O2 What total volume of ozone measured at a pressure of 22.0 mmHg and a

    asked on October 23, 2011
  28. Chemistry 105

    Which of the following reactions are redox reactions? 1. Al(s)+3Ag^+(aq)-->Al^3+(aq)+3Ag(s) 2. SO3(g)+H2O(l)-->H2SO4(aq) 3. Ba(s)+Cl2(g)-->BaCl2(s) 4. Mg(s)+Br2(l)-->MgBr2(s)

    asked on October 10, 2011
  29. newton's method #2

    i want to verify that when newton's method is used to compute sqrt(R) (by solving the equation x^2=R), the sequence o iterates is defined by x_(n+1)=.5(x_(n) + (R/x_(n))

    asked on September 28, 2008
  30. Micro Economics

    Health maintenance organizations (HMOs): A. are based on the traditional fee-for-service system of paying physicians. B. charge a fixed amount per member, hire many of their own physicians, and provide health services only to members. C. are also known as

    asked on June 6, 2008
  31. math

    At 9:30 A.M. Andrew left Exeter for Portsmouth, cycling at 12 miles per hour At 10:00 A.M. Stacy left Portsmouth for Exeter, cycling at 16 miles pewr hour. The distance from Exeter to Portsmouth is 20 miles. At what time did they meet?

    asked on November 23, 2007
  32. physics help

    Larry weighs 300 N at the surface of the earth. what is the weight of the earth in the gravitational field of Larry? -would it still be 300 N

    asked on October 17, 2007
  33. physics

    A 920 g empty iron kettle is put on a stove. How much heat in joules must it absorb to raise its temperature form 15.0° C to 93.0° C? (The specific heat for iron is 113 cal/kg · °C.)(1 cal = 4.184 J)

    asked on January 22, 2013
  34. Math

    For the given graph of y=f(x), sketch the graph y=1/f(x). clearly show the asymptote(s) with a dotted line and write the coordinates of the invariant points

    asked on April 2, 2020
  35. Production/Operations Management

    Here is a list of activity times for a project as well as crashing costs for its activities. Determine which activities should be crashed and total cost of crashing if the goal is to shorten the project by three weeks as cheaply as possible. First

    asked on December 1, 2018
  36. Math

    Find the effective rate of interest for 5% compounded monthly.

    asked on September 18, 2015
  37. chemistry

    3CuCl2 *2H2O + 2Al = 3Cu + 2AlCl3 + 6H2O Determine the number of grams that should have been produced when 1.25g of copper (2) chloride dehydrate reacts with excess aluminum so i'm not really sure how you're supposed to calculate the number of grams with

    asked on November 27, 2014
  38. physics conceptual

    The tires of a car support the weight of a stationary car. If one tire has a slow leak, the air pressure within the tire will _______ with time, the surface area between the tire and the road will ________ with time, and the net force the tire exerts on

    asked on January 27, 2013
  39. Calculus grade 12

    Determine the equation of the tangent line to the function (² = square): f(x) = x + cos²x at x = pie/4

    asked on April 12, 2012
  40. chemistry 105

    Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)-->Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.7 g. What minimum mass of H2SO4(in g) would you need? What mass of H2

    asked on October 10, 2011
  41. chemistry 105

    Complete and balance each of the following equations for gas-evolutions. Express answer as a chemical equation. Identify all the phases in your answer. HCl(aq)+K2SO3(aq)--> HCl(aq)+KHCO3(aq)--> HC2H3O2(aq)+NaHSO3(aq)--> (NH4)2SO4(aq)+KOH(aq)-->

    asked on October 10, 2011
  42. Algebra

    The resistance in an electric circuit varies inversely with the current. If the resistance is 12 ohms when the current is 4 amps, what is the resistance when the current is 8 amps.?

    asked on February 19, 2011
  43. english

    Please tell me if I should use to or too in the following sentence: Anthony knew all (to, too) well that he shouldn't have eaten a third piece of lasagna.

    asked on October 19, 2010
  44. science physics

    Two locomotives approach each other on parallel tracks. Each has a speed of v = 95 km/h with respect to the ground. If they are initially d = 7.5 km apart, how long will it be before they reach each other?

    asked on October 6, 2010
  45. Chemistry

    State whether each of the following aqueous solutions would be acidic, basic, or neutral. Include appropriate net-ionic equations to show why a given solution is acidic or basic. a) NaNO3 b)KC6H5CO2 c)50:50 mixture of C6H5CO2H+KC6H5CO2 d)(CH3NH3)Cl e)50:50

    asked on March 13, 2010
  46. pre calc

    Two forces of 50 and 70 N (newtons) act on an object. The angle between the forces is 40°. Find the magnitude of the resultant and the angle that it makes with the smaller force.

    asked on April 7, 2008
  47. Math

    Write a mixed number that is equivalent to 16/3

    asked on December 12, 2019
  48. Math

    Mary sells fax machines which come in Standard and Enhanced models. The Standard model sells for $230 and the Enhanced model sells for $305. If Mary sold a total of 31 units and took in $7,730, how many of the Enhanced model did she sell? Do not enter

    asked on September 6, 2019
  49. English

    Which of the following is unimportant for an introduction in formal or academic writing? 1.Entertaining the audience 2.Establishing the key point the piece of writing will make. 3.Discussing your opinion on the topic for at least three sentences.

    asked on July 9, 2016

    Suppose that at least 13.0 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon? Give frequency for

    asked on August 10, 2015
  51. chemistry

    2.241 g sample of nickel combines with oxygen to produce 2.852 g of metal oxide. Calculate the number of grams of xygen in the metal oxide.

    asked on March 17, 2015
  52. chemistry 11

    Food manufacturers sometimes add calcium acetate to puddings and sweet sauces as a thickening agent. What volume of 0.500 mol/L calcium acetate, Ca(CH3COO)2 (aq), contains 0.300 mol of acetate ions? So I've been over this a hundred times and I still can't

    asked on December 17, 2014
  53. Statistics

    Scores on a certain exam are normally distributed with a mean of 78 and a variance of 25. What is the score obtained by the top 5% of the students? I do not understand the 5% part. What does the tail look like on the bell-shaped graph?

    asked on December 13, 2013
  54. math

    Find the accumulated amount A, if the principal P is invested at an interest rate of r per year for t years. P = $2500, r = 3%, t = 3, compounded quarterly $ ?

    asked on November 20, 2012
  55. Finance

    Use the following financial statements for Lake of Egypt Marina, Inc. LAKE OF EGYPT MARINA, INC Balance Sheet as of December 31, 2012 and 2011 (in millions of dollars) 2012 2011 2012 2011 Assets Liabilities and Equity Current assets: Current liabilities:

    asked on September 9, 2012
  56. Chemistry 105

    A heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium. What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 9.3 atm?

    asked on October 23, 2011
  57. chemistry 105

    Consider the following reaction: Li2S(aq)+Co(NO3)2(aq)-->2LiNO3(aq)+CoS(s) What volume of 0.150 M Li2S solution is required to completely react with 125 mL of 0.150 M Co(NO3)2?

    asked on October 10, 2011
  58. Physics

    A golf ball is given an initial speed of 20 m/s and returns to ground level. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? Neglect friction. 1. 60 degrees 2. 45 3. 30 4. 15 The answer is 45 but I was

    asked on June 15, 2011
  59. pre algebra

    $29/kg = how many cents/ g???? im really confused

    asked on January 5, 2011
  60. Physical Science

    A rock thrown straight up climbs for 2.50 s,the falls to the ground. Neglecting the air resistance, with wat velocity did the rock strike the ground?

    asked on March 6, 2010
  61. Physical Science

    How much would 80.0 kg person weight (a) on Mars, where the acceleration of gravity is 3.93 m/s2, and (b) on Earth's Moon, where the acceleration of gravity is 4.63 m/s2?

    asked on March 6, 2010
  62. Physical Science

    A cubic tank holds 1,000.0 kg of water. What are the dimensions of the tank in meters? Explain your answer.

    asked on March 6, 2010
  63. physics

    The New River Gorge bridge in West Virginia is a 518 m long steel arch. How much will its length change between temperature extremes -19°C and 39°C? (answer in cm)

    asked on November 30, 2009
  64. Numerical Analysis

    x 0 2 3 4 y 7 11 28 63 a)_Using these values, use the Lagrange interpolation process to obtain a polynomial of least degree. b)_rearrange the points in the table of a) and find the newton form of the interpolating polynomial. Show that they are the same

    asked on October 6, 2008
  65. life science!

    Whats the difference between decomposer,consumer,and producer? give an example of each and tell how producers make their own food. I looked in my book but it just doesnt say anything about any of those 3 things!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! For food: A

    asked on September 9, 2006
  66. Math

    In your​ class, you have scores of 72, 67, 85, and 76 on the first four of five tests. To get a grade of C, the average of the first five tests scores must be greater than or equal to 70 and less than 80. - Solve an inequality to find the least score you

    asked on June 11, 2020
  67. Math

    Three times a number increased by seven is less than eleven

    asked on January 21, 2020
  68. algebra

    There are 5 red tiles and 5 blue tiles with the letter A in a bag. There are also 6 red tiles and 4 blue tiles with the letter B in the bag. What is the probability that a randomly selected tile is blue or has the letter B?

    asked on September 22, 2019
  69. Physics

    I've got a few questions. I'll show my work but I'm struggling and need to turn in this homework by midnight :( 1) Calculate g (the acceleration due to gravity) for the space shuttle’s orbit, 200 km above the Earth’s surface. M= 5.98x10^24kg (given on

    asked on July 24, 2019
  70. Science

    How are the respiratory and circulatory and respiratory systems similar? A) Both systems provide glucose and other substances to cells. B) Both systems regulate blood flow throughout the body. C) Both systems help remove carbon dioxide from the body. D)

    asked on March 30, 2018
  71. Sciene Degree

    Pressure, P, is directly proportional to temperature,T, and P is 28 lb per square inch when T is 112 degress Kelvin. What is the pressure when the temperature is 124 degrees Kelvin? If required, round answer to three decimal places. _____lbs per square

    asked on September 10, 2016
  72. English

    In academic writing, introductions must include a thesis statement. 1.True 2.False I think it true, please recheck my work

    asked on July 9, 2016
  73. interest

    Find the balance on an account if you invest $100 at 5% for 10 years compounded annually.

    asked on April 17, 2016
  74. Math

    A round silo is 55 feet tall and has a 18 foot radius. How high would a load of 31000 cubic feet of grain fill the silo?

    asked on October 7, 2015
  75. Math

    If you deposit 10,000 every year into an account paying 5% interest compounded annually, how long will it take to accumulate 1,000,000?

    asked on September 20, 2015
  76. science: chemistry

    A buffered solution is made by adding 47.4 g C2H5NH3Cl to 1.00 L of a 0.68 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

    asked on July 23, 2015
  77. Physics

    Answer True or False to each case. Coulomb's law states that the force between static charges Q1 and Q2 is proportional to Q1 Q2. is proportional to the total charge Q1+Q2. is K Q1Q2/r where K is a universal constant. is proportional to 1/r2. is a force of

    asked on July 9, 2015
  78. Chemistry

    Neutralization reaction HCL(aq) + NaOH(aq) -> NaCl(s) + H2O(l) Use your results to determine the netball change of the neutralization reaction, in kJ/mol of NaOH, Write the thermochemical equation for the neutralization reaction. I'm not sure how to even

    asked on March 9, 2015
  79. Chemistry

    Calculate the rms speed of Br2 molecules at 23 °C and 1.00 atm. What is the rms speed of Br2 at 23 °C and 1.50 atm?

    asked on February 19, 2015
  80. chemistry

    What mass of sodium hydroxide pellets must be poured into a waste drum containing 20.0 L o 3.0 mol/L sulphuric acid to completely neutralize the waste acid solution? Write a balanced chemical equation for this reaction. okay, so here is the work I already

    asked on December 15, 2014
  81. Can someone Explain this(math)

    34, 36, 43, 46, 47, 48, 48, 52, 53, 54 Box And whisker Plot I Don't Understand these at all can someone Explain without totally giving me the answer?

    asked on February 21, 2014
  82. Chem Simple question

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

    asked on September 29, 2013
  83. math

    the product of 1000 whole number is 1000, what is the largest possible value the sum of these numbers can have

    asked on August 26, 2013
  84. Econoics

    Cobb-Douglas Production function Y=60K^1/3 L^2/3 If K=64 L=8 calculate MPL What is the equilibrium real wage in the economy

    asked on July 1, 2013
  85. Math

    Sam needs to cut a piece of sheet metal into 8 pieces. All the cuts are made in the same direction. It takes him 5 minutes to make each cut. How many cuts will Sam make? How would making a table help you find the number of minutes it took Sam to cut the

    asked on February 14, 2013
  86. math

    Phillip, the proprietor of a vineyard, estimates that the first 9600 bottles of wine produced this season will fetch a profit of $5 per bottle. However, the profit from each bottle beyond 9600 drops by $0.0002 for each additional bottle sold. Assuming at

    asked on November 20, 2012
  87. Chemistry

    The Cu2+ ions in this experiment are produced by the reaction of 1.0g of copper. Information already found out .016 mol Cu2+ produced Overall reaction is Cu2+(aq)+Cl-(aq)+Cu(s)=2 CuCl(s) Maximum mass of CuCl that can be prepared from the reaction sequence

    asked on October 23, 2012
  88. Calculus grade 12

    Determine the derivative of each function A1) y = e^x(Sin²x) A2) y = e²Sin²x B1) y = (x³ + 1)e^-2 B2) y = (x² + 1)e^-2 C) y = x²(theta^Sinx)

    asked on April 20, 2012
  89. Calculus Grade 12 University

    a total of 8 meters of fencing are going to be used to fence in a rectangular cage for pets and divide it into three smaller cages **the photo that is shown with this question is three (3) boxes stuck together side by side horizontally*** determine the

    asked on April 12, 2012
  90. Calculus Grade 12 University

    Use the second derivative test to find the local minimum and maximum values of each function, wherever possible. A) f(x) = 16/x + x^2 B) s(t) = t^4 - 8t^3

    asked on March 23, 2012
  91. Math!! Please help!!!

    Given 1/3 Y÷1/2 X=4 Discuss its meaning. Create a shape for X and for Y that will make this true. Draw and label the shapes, then illustrate how the quotient was obtained. Your drawing must be neat and accurate.

    asked on December 6, 2011
  92. Math

    Lalph Rauren was famous for discovering potential models as he walked the streets of New York. One day he spotted four girls who later became top models: Amy, Mary, Kay, and Beth. One was discovered walking through an apartment building, one in a coffee

    asked on November 13, 2011
  93. Chemistry 105

    A sample of N20 gas has a density of 2.65 g/L at 298 K. What must be the pressure of the gas (in mmHg )?

    asked on October 23, 2011


    asked on October 6, 2011
  95. Calculus

    A stone is dropped from the edge of a roof, and hits the ground with a velocity of -145 feet per second. How high (in feet) is the roof

    asked on July 22, 2011
  96. economics- free trade.

    What are the advantages and disadvantages of free trade?

    asked on July 5, 2011
  97. Math

    If a pro basketball player has a vertical leap of about 35 inches, what is his hang time? Use the hang-time function V = 48T²

    asked on April 24, 2011
  98. social studies

    What are the pros and cons of textbook social studies learning?

    asked on April 10, 2011
  99. physics help pleased

    Two trains on separate tracks move toward one another. Train 1 has a speed of 125 km/h and train 2 a speed of 100.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of

    asked on January 28, 2011
  100. statistics

    Given a test statistic of z= 1.50, the p-value for a right-tail (upper tail) test is approximately

    asked on October 5, 2010


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