1. Math

    twice what number is equal to three times that number
  2. math

    two less than three times a number is equal to 16. what is the number?
  3. math

    The quotient of a number and 7 is equal to 6. What is that number?
  4. Math

    Twice the sum of a number and 4 is equal to 22. What is the number?
  5. math 115

    - (-4)3rd power + (-3)2nd power - .5 3rd power is 72.875 correct? The 4 is negative because its to the 3rd power, but the negative before it makes it positive, am I right? thanks
  6. math log rules / chemistry

    hey so i have this equation i need to manipulate to solve for F- concentration. E1 = constant - 0.05916log[F] E2 = constant -0.05916log([F]+[Spiked]) E2-E1=-0.05916log(F+S) + 0.05916log[F] E2-E1/0.05916) = log[F+S] + log[F] how do I solve for log[F] ???
  7. math log rules / chem

    hey so i have this equation i need to manipulate to solve for F- concentration. E1 = constant - 0.05916log[F] E2 = constant -0.05916log([F]+[Spiked]) E2-E1=-0.05916log(F+S) + 0.05916log[F] E2-E1/0.05916) = log[F+S] + log[F] how do I solve for log[F] ???
  8. physics

    How long it takes for a 800 kg car going from 0 km / h at 90 km / h if we assume that the machine delivers a constant power of 40 HP during this period?
  9. chemistry

    The disssociation constant of benzoic acid is 1x10 power -4 . the pH of 0.01M solution of its sodium salt will be......?
  10. physics

    An elevator weigting 400 kg/s is to be lifted up at a constant velovity of 3cm/s.what would be the minimum power of the motor to be used ?
  11. Chemistry

    Initially, we place 2 mol of A and 4 mol of B in a 0.5 L flask. At equilibrium, the flask contains 0.3 mol of C. Determine the value of K. A(g) + B(g) <--> 3C(g) + 2D(g)
  12. physics

    can an object be in equilibrium (the state in which the net force on an object is zero) if only one force acts on the object?
  13. Science

    If you have 25 glucose molecules transporting out to 5 glucose molecules how will the molecules need to move to reach equilibrium? Out
  14. Biology - Diffusion

    I know diffusion is movement of matter from high to low concentration. Does that mean that it will try to make the molarity of both sides equal?
  15. chemistry

    I wanted to check my True and False Chemistry HW. I am not 100% they are correct. 1.the number of neutrons in an atom is reffered to as its atomic number False 2.the periodic table is arranged by increasing atomic number True 3.atomic number is equal to the number of electrons...
  16. Physics

    I did a lab about Standing waves on a string and it asked me the following qeuestions: Discuss any errors arising from the method used to establish the standing wave pattern. - I think air resistance, linear density of string is non uniform, tension of the string is not ...
  17. Algebra

    simplify 9to 6th power times 3 to the 7th power all over 9 to the 8th power times 3 to the 6th power
  18. Intermediate Algebra

    add or subtract the following polynomials as indicated (5.9x to the 3rd power+3.4x to the 2nd power - 7)-92.9x to the 3rd power -9.6x to the 2nd power +3)
  19. Biology 30

    In what size populations might you expect it to be relatively common for alleles to become fixed? Why? I think that larger populations would be more likely to have fixed alleles, since perfect Hardy-Weinberg equilibrium states that there will be no change in allele frequency ...
  20. MECHANICS

    A string of length l carries a small pulley C from which is suspended a load W. The string hangs between two vertical walls which are at distance d apart.The end A is higher than end B by height h.find position of equilibrium defined by angle X. X is angle between AC and AB. d...
  21. Molly

    The CoolWheels Toy Company is designing a new track where a car (mass 60 g) is launched by a spring-loaded starter (k=11 N/m) and goes through a vertical loop (radius 9 cm). If the spring is depressed ∆x=19 cm from equilibrium, what is the speed of the car at the top of ...
  22. chemistry

    A sample of NH4HS(s) is placed in a 2.57 −L flask containing 0.140 mol NH3(g). NH4HS(s)⇌NH3(g)+H2S(g)KP=0.108at25∘C What will be the total gas pressure when equilibrium is established at 25∘C? any idea on how to solve it like an outline? Thanks
  23. physics

    A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N
  24. Econ Online

    Analyze what happens to the market for cheeseburgers if the price of the cheese rises (cheese being the part of the cost of a cheesburger). Be specific and explain (or is not affected) for each of the following: 1. supply curve 2. the demand curve 3. the equilibrium quantity 4...
  25. physics

    A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N
  26. physics

    The free-body diagram in the drawing shows the forces that act on a thin rod. The three forces are drawn to scale and lie in the plane of the screen. Are these forces sufficient to keep the rod in equilibrium, or are additional forces necessary I assume this is what I just ...
  27. math

    The number of days, d, it takes for a construction crew to repave a certain road varies inversely as the number of workers, w, that work on the project. So my equation is d = k/w If w = 16, how do I find d? d = k/16 Also, why is Y = 2x^2 + 3√x not a quadratic equation? It's ...
  28. physics

    (a) 2.0 kg of molten copper at its melting point of 1083 ºC (the copper is 100% liquid) is poured into a mold in a cooling water bath at 20 ºC. What mass of water is needed to bring the solidified copper and water to an equilibrium temperature of 30 ºC, assuming the only ...
  29. algebra

    suppose the supply and demand for a certain videotape are given by: Supply:p=1/5q^2 Demand p=-1/5q^2+30 where p is price and q is quantity find the equilibrium price?
  30. Chemistry

    At equilibrium, what is the rate of production of reactants compared with the rate of the production of products? much higher higher*** the same lower
  31. Chem13

    The reaction CO(g) + 2 H2(g)--> CH3OH(g) was studied using a 5.19 L flask and an initial condition of 26.9 g CO and 2.34 g H2. At equilibrium, the flask contains 8.34 g CH3OH. Calculate Kc for this reaction.
  32. Chemistry

    Hello, i seem to be stuck on a problem and do'nt know why im not gettin the right answer.I have the he Ka and Kb values for each of the weak acids and bases from the chart and I keep getting zero and the second one 2.27*10^-24 is this correct?? Thank uu Solve an equilibrium ...
  33. Physics

    To streatch a certain nonlinear spring by an amount 2x requires a force F given by F=40x-6x^2 where F is in newtons and x is in meters. What is the change in potential energy when the spring is stretched 2 meters from its equilibrium position? a)16 J b)28 J c)56 J d)64 J e)80 ...
  34. Chemistry

    Hello, i seem to be stuck on a problem and do'nt know why im not gettin the right answer.I have the he Ka and Kb values for each of the weak acids and bases from the chart and I keep getting zero and the second one 2.27*10^-24 is this correct?? Thank uu Solve an equilibrium ...
  35. Chemistry

    Hello, i seem to be stuck on a problem and do'nt know why im not gettin the right answer.I have the he Ka and Kb values for each of the weak acids and bases from the chart and I keep getting zero and the second one 2.27*10^-24 is this correct?? Thank uu Solve an equilibrium ...
  36. Macroeconomics

    Assume that preferencse are given by u(c,L) = 2*ln(c) +ln(L). The wage rate is $15 and the person has 120 hours of time available. Profits are 0. Taxes are 0. Write down two equations that describe the constraints faced by this consumer. Find an equation for the Marginal Rate ...
  37. Chemistry

    A patient with untreated diabetes may have a blood concentration of acetone of 20mg/100mL. Determine the molar mass of acetone and use this number to convert this concentration to mol/L. Okay, so I was able to determine the molar mass of acetone (= 58.09g/mol) however, i'm not...
  38. College physics

    The motor of a ski boat generates an average power of 7.30 104 W when the boat is moving at a constant speed of 10 m/s. When the boat is pulling a skier at the same speed, the engine must generate an average power of 8.40 104 W. What is the tension in the tow rope that is ...
  39. calculus

    A sample of a radioactive substance decayed to 94.5% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? (b) How long would it take the sample to decay to 65% of its original amount?
  40. Physics!!

    Green light is emitted when electrons in a substance make a particular energy-level transition. If blue light were instead emitted from the same substance, would it correspond to a greater or lesser change of energy in the atom? and why?
  41. Chemistry

    Posted by ann on Sunday, October 17, 2010 at 4:26am. In melting point determination, why shouldn't a substance be re-melted? (i.e. why should we not re-melt a substance that has previously been melted in a melting point tube?)
  42. chemistry

    A 0.750 g sample of an unknown substance is dissolved in 20.0 g of benzene, C6H6. The freezing point of the solution is 4.53 oC. Calculate the molar mass of the substance. The normal freezing point for benzene is 5.53 oC and Kf is 5.12 oC/m.
  43. chemistry

    A 0.750 g sample of an unknown substance is dissolved in 20.0 g of benzene, C6H6. The freezing point of the solution is 4.53 oC. Calculate the molar mass of the substance. The normal freezing point for benzene is 5.53 oC and Kf is 5.12 oC/m.
  44. math with application

    If 12 % of a radioactive substance decays in 7 hours, what is the half-life of the substance? Carry out all calculations exactly, then round the final answer to three decimal places. The half life is what hours?
  45. Maths

    the ratio of the number of boys to the number of girls in a class is 4:7. if there are 12 more girls than boys, find the total number of pupils in the class.
  46. algebra

    what is the first step when solving x/15=3/5? write a proportion using an unknown value x and the ratio 5:6 then solve it. in an orchestra, the ratio of trombones to violas is 1 to 3. a. there are 9 violas. write a proportion that gives the number t of trombones in the ...
  47. Finance

    The balance sheet for the Raider Company shows Total assets of $12,900 financed by $3,000 of Debt and $9,900 of Stockholders' equity. For the Target Company Total assets of $4,900 are financed by $1,800 ofDebt and $3,100 of Stockholders' equity. The Raider Company ...
  48. science

    The acceleration of gravity is a constant equal to
  49. chemistry

    A solute is added to water and a portion of the solute remains un-dissolved. When equilibrium between the dissolved and un-dissolved solute is reached, the solution must be
  50. Chemistry

    The pesticide DDT (C14H9Cl5)... Express these concentrations in ppm and in milimoles per liter. Orchard - Sample size: 250.0mL Mass of DDT: 0.030 mg Residential - Sample size: 1.750 L Mass of DDT: 0.035 mg Residential After a Storm - Sample size: 50.0 mL Mass of DDT: 0.57 mg ...
  51. managerial economicsQ3

    Suppose the inverse market demand equation is P = 80 ¡V 4(QA+QB), where QA is the output of firm A and QB is the output of firm B, and both firms have a constant marginal cost of $4 (fixed costs are zero). (a)Write down the profit equations for firms A and B. (b)Write down ...
  52. Chemistry

    You are given a compound with an unknown concentration and you have five samples with known concentration of the compound. List 3 pieces of information you need to determine in order to calculate the unknown concentration spectrophotometrically.
  53. science

    A substance has a half-life of 10,000 years and an initial mass of 1,000 grams. How many years will pass before only 250 grams of the substance's parent material is left?
  54. Social Studies

    To many people the most meaningful of these classifications [of government] is the one that depends on the number of persons who can take part in the governing process. why might this particular classification be most meaningful to people? A.it indicates the balance of power ...
  55. Social Studies

    o many people the most meaningful of these classifications [of government] is the one that depends on the number of persons who can take part in the governing process. why might this particular classification be most meaningful to people? A.it indicates the balance of power in...
  56. ethics

    There is a difference between power and authority. Which statement below best describes the relationship and/or difference between power and authority? All supervisors have power and authority. Supervisors gain authority from the people they supervise and power from those who ...
  57. math

    If x and y are positive numbers and the average of 4, 20 and x is equal to the average of y and 16, then the ratio x: y is
  58. Dynamics

    Constant of area velocity for a central force motion of a particle does not imply that_________ a)Equal areas were are swept by the radius vector in equal times. b)The tangential velocity varies inversely as the length of the radius vectors c)The angular momentus is conserved ...
  59. Math

    The school band is comprised of middle school students and high school students, but it always has the same maximum capacity. Last year the ratio of the number of middle school students to the number of high school students was 1:8. However, this year the ratio of the number ...
  60. Math

    The school band is compromised of middle school students and high school students, but it always has the same maximum capacity. Last year the ratio of the number of middle school students to the number of high school students was 1;8. However, this year the ratio of the number...
  61. Chemistry

    A solution with pH = 4 has 1. relatively high concentration of OH- 2. relatively low concentration of H3O+ 3. relatively high concentration of H3O+ 4. zero concentration of OH-
  62. physics

    a car of mass 1200 kg starts from rest, accelerates uniformly to a speed 4ms-1 in 2 seconds and continues moving at this constant speed in a horizontal straight line for additional 10s. the brakes are then applied and the car is brought to rest in 4s. a constant resistance ...
  63. Chem please help

    What does the second law of thermodynamics say about entropy? A. Only changes in entropy can be measured. B. The entropy in a system is zero at equilibrium. C. The entropy in a system and its surroundings tends to increase. D. Entropy cannot be created or destroyed. I think c.
  64. physics

    The motor of a ski boat generates an average power of 5.83 × 104 W when the boat is moving at a constant speed of 17.4 m/s. When the boat is pulling a skier at the same speed, the engine must generate an average power of 8.45 × 104 W. What is the tension in the tow rope that...
  65. Physics

    The motor of a ski boat generates an average power of 7.30 104 W when the boat is moving at a constant speed of 10 m/s. When the boat is pulling a skier at the same speed, the engine must generate an average power of 8.40 104 W. What is the tension in the tow rope that is ...
  66. College Geology Homework

    Suppose you have a sample of potassium feldspar from a rhyolite and you measure the ratio of atoms of 40Ar to 40K of 0.024 to 1, or for every 10000 atoms of 40K you find 240 atoms of 40Ar. For this problem, consider the decline of 40K from an initial value to the measured ...
  67. AP Chemistry

    The ionic substance T3U2 ionizes to form T2+ and U3− ions. The solubility of T3U2 is 4.07×10−20 mol/L. What is the value of the solubility-product constant?
  68. chem

    When 0.5mol of a certain ionic substance is dissolved in 1.0kg of water, the freezing point of the resulting solution is -3.72 ∘ C .(Freezing point depression of water is -1.86 kgwater molsoluteparticles ). How many ions does the substance give when it dissolves?
  69. physics

    A mass attached to a spring executes simple harmonic motion in a horizontal plane with an amplitude of 1.07 m. At a point 0.4815 m away from the equilibrium, the mass has speed 3.87 m/s. What is the period of oscillation of the mass? Consider equations for x(t) and v(t) and ...
  70. physics

    two blocks are connected by a string. the smooth incline surface makes an angle of 42 degrees with the horizontal, andthe block on the incline has a mass of 6.7 kg. find the mass of the hanging block that will cause the system to be in equilibrium. (the pully is assumed to be ...
  71. Chemistry

    Two colourless solutions are mixed in a stoppered flask. as the reaction proceeds, the resulting solution turns red, and a colourless gas is formed. after a few minutes, no more gas is evolved but the red colour remains. what evidence is there that equilibrium has been ...
  72. physics urgent!

    A vaulter holds a 34.1 N pole in equilibrium by exerting an upward force U with her leading hand and a downward force D with her trailing hand. Point C is the center of gravity of the pole. Given d1 = 1.100 m, d2 = 1.65 m, and d3 = 2.75 m, what are the magnitudes of U and D? i...
  73. physics

    An object is in equilibrium under the action of three forces.Two of these forces,A an B,are illustrated in the accompanying diagram.The third force,F,is not illustrated. 3.1What is meant by the resultant of A and B? 3.2Determine by means of accurate construction and ...
  74. chemistry

    The reaction Cl(g)+ O3(g) --> ClO(g)+ O2(g) is the first-order in both reactants. Determine the pseudo-first-order and second-order rate constants for the reaction from the data in the table below if the initial ozone concentration was ..0000000000825 M or 8.25*10^-11 M. ...
  75. chemistry

    The reaction Cl(g)+ O3(g) --> ClO(g)+ O2(g) is the first-order in both reactants. Determine the pseudo-first-order and second-order rate constants for the reaction from the data in the table below if the initial ozone concentration was ..0000000000825 M or 8.25*10^-11 M. ...
  76. Physics

    A proton and an electron have the same kinetic energy upon entering a region of constant magnetic field. What is the ratio of the radii of their circular path?
  77. Physics

    A proton and an electron have the same kinetic energy upon entering a region of constant magnetic field. What is the ratio of the radii of their circular path?
  78. Statistics

    I have 33 whole number observation data set. The five number set from the box and whisker plot is 16, 20, 22, 30, 46). How many observations are strictly less than 22(answer should be a ra nge of numbers)? Is it possible that there is no observation equal to 22? Explain ...
  79. Statistics

    I have 33 whole number observation data set. The five number set from the box and whisker plot is 16, 20, 22, 30, 46). How many observations are strictly less than 22(answer should be a ra nge of numbers)? Is it possible that there is no observation equal to 22? Explain ...
  80. physics

    Pete slides a crate up a ramp at an angle of 27◦ by exerting a 242 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is 0.4. How much work did Pete do when the crate was raised a vertical distance of 2.22 m? Answer in ...
  81. College Chemisty

    The pH of water collected in a stormwater run-off downstream from a Union Carbide chemical factory is 4.82. Calculate the H+ ion concentration of rainwater. The problem may start with: pH= -log H+ = 4.82. The answer is 1.5x10 power -5. Again, Can you please show steps for maths.
  82. Macroeconomics

    Here are my answers and i wanted to check if they were correct to the quiz posted below. 1.a because its a model for the ppf 2.b Just wha thappens when technology is completely ignored 3.a because the model is based off of inputs and outputs 4.c because savings greatly ...
  83. check math

    Here are my answers. Can you check if I got the right answers? Thank you! solve for x, where x is a real number. x^2+3x-4=14 x=6,3 (x^4-1)/(x^3)=0 x=1 (x-5)^2=9 x=2,8 2x^2+5x=8 x= [-5+/-sqrt(89)]/4 for first one x=-6 or x=3, factors are (x+6)(x-3) second... also x=0 third ... ...
  84. social studies

    to achieve full employment without inflation; > to restore external equilibrium and defend the dollar; > to enhance the efficiency and flexibility of our private and public economies; > to widen the benefits of prosperity; > to improve the quality of American life...
  85. math

    At the 6th grade school dance,there are 132 boys and 89 girls and 14 adults? Write the ratio of the number of boys to the number of girls?
  86. math

    the ratio of the number of men to the number of woman working at tommys pub is 7:2.altogather there are 360 workers at the company. how many of the workers are woman.
  87. Math

    Is the following statement always, sometimes, or never true for numbers greater than zero: "In equivalent ratios, if the numerator of the first ratio is greater than the denominator of the first ratio, then the numerator of the second ratio is greater than the denominator of ...
  88. Chemistry

    At a certain temperature, the Kp for the decomposition of H2S is 0.813. H2S (Two wa arrow) H2(g) + S(g) Initially, only H2S is present at a pressure of 0.280 atm in a closed container. What is the total pressure in the container at equilibrium?
  89. math

    The ratio of the number of male students to the number of female students in a school is 3:8. How many students are there if there are 48 females?
  90. Math Expoents

    One microgram is equal to 1x10^-6 gram. If the mass of a substance is 8x10^9 micrograms, what is its mass in grams? a) 1.25x10^-15 b) 1.25x10^-3 c) 8x10^3 d) 8x10^15
  91. Mechanics

    A constant force of 40newton is applied tangentally to the rim of the wheel with 20cetimetre radius the wheel hs moment of intial 30kg find (a)angular acceleration (b)angular speed after 4second frm rest (c)d number of revolution made in(d)show that d work done of d wheel in ...
  92. science

    whaen an atom has an equal number of protons and electrons, the charge of the atom is _________________? Since they are equal, they cancel each other out. The charge is zero. I hope this helps. Thanks for asking.
  93. Science

    What can you say about the motion of a body if: a. its displacement-time graph is a straight line inclined with the time axis b. its velocity-time graph is a straight line inclined with the same axis. c. its velocity- time graph is a parabola A)the velocity is constant and it ...
  94. chem 2

    At a certain temperature, the Kp for the decomposition of H2S is 0.791. H2S<--> H2 + S Initially, only H2S is present at a pressure of 0.111 atm in a closed container. What is the total pressure in the container at equilibrium? Please Help!
  95. Chemistry

    At a certain temperature, the Kp for the decomposition of H2S is 0.774. H2S(g) <---> H2(g)+S(g) Initially, only H2S is present at a pressure of 0.120 atm in a closed container. What is the total pressure in the container at equilibrium?
  96. CHEMISTRY

    Method for getting correct answer for this? Thank you! For the reaction A ↔ 2B K = 3.80x10-7 , if one started with 0.154 M A approximately how much A and B would there be after equilibrium had been established? a. very little A, 0.154 M B b. 0.126 M A; 0.027 M B c. 0.154...
  97. Physic please help!

    In the photoelectric effect, suppose that the intensity of the light is increased, while the frequency is kept constant. The frequency is greater than the minimum frequency f0. State whether each of the following will increase, decrease, or remain constant, and explain your ...
  98. Chemistry

    A balloon has a volume of 2.75 liters at 25 degrees celsius. What would the balloon's volume be if the temperature is raised to 95 degrees celsius and the pressure remains constant?
  99. French: ms sue or any French expert

    Ecrivez le passé compose ou l'imparfait du verbe pour completer chaque phrase Conjugate the verb in passé compose or imparfait Jouer 1. Nous______ au baseball tous les etes Recevoir 2. Elle _____ un chien pour son troisieme anniversaire. Prendre 3. Nous _____ toujours l'...
  100. chemistry

    What is the concentration oh hydrogen ions in a solution containing .676 M HOCN and .413 M NaOCN? The ionization constant of cyanic acid is 3.5 x 10^-4. Answer in units of M.
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