Albert

Most popular questions and responses by Albert
  1. Chemistry

    when 25.0 mL of a solution containing both Fe2+ and Fe3+ ions is titrated with 23.0 mL of 0.0200 M KMnO4 (in dilute sulfuric acid). As a result, all of the Fe2+ ions are oxidized to Fe3+ ions. Next, the solution is treated with Zn metal to convert all of

    asked on December 15, 2011
  2. Physics Help!

    A skier wants to build a rope tow to pull herself up a ski hill that is inclined at 15 with the horizontal. Calculate the tension needed in the rope to give the skier's 54kg body a 1.2 m/s^2 acceleration.

    asked on January 4, 2018
  3. Chemistry

    How do you differentiate between fluorene and acetanilide? Suggest procedures and steps involved other than melting point and chromatography.

    asked on April 1, 2013
  4. physics

    Suppose the straight-line distance between New York and San Francisco is 4.4 106 m (neglecting the curvature of the earth). A UFO is flying between these two cities at a speed of 0.69c relative to the earth. What do the voyagers aboard the UFO measure for

    asked on July 8, 2013
  5. Chemistry

    How do you distinguish between fluorene and acetanilide? Suggest methods other than melting point and chromatography.

    asked on March 28, 2013
  6. math

    9. which set of output values correctly completes the function table? y=6-x input (X) output (y) -2 ? -1 ? 3 ? ----------------------- 4,5,3 -8,-7,3 8,7,3 11. What is the function rule shown by the table? input(x) output(y) -2 -3 0 1 1 3 2 5

    asked on June 13, 2018
  7. math

    which values can be substituted for x to make the inequality x - 4 >0 true? choose all that apply A. 0 B. 3 C. 4 D. 18 my answer is 0 and 4 please check my answer's

    asked on June 13, 2018
  8. Finance

    Evans Technology has the following capital structure. Debt ............................................ 40% Common equity .......................... 60 The aftertax cost of debt is 6 percent, and the cost of common equity (in the form of retained earnings)

    asked on November 16, 2015
  9. physics

    a turntable rotates about a fixed axis, making one revolution in 10s . the moment of inertia of the turntable about it's axis is 1200kg/m^2 . a man of mass 80kg , initially standing at the center of the turntable, runs out along a radius. what is the

    asked on October 17, 2014
  10. Life orientation

    Critically discuss six ways in which individual,groups and broader of South African community can be influenced by humans rights violations

    asked on April 27, 2019
  11. Chemistry

    The reaction NO2(g) + NO2(g) → N2O4(g) is second order with a rate constant of 0.044 /M·s at a particular temperature and pressure. If the initial concentration of NO2(g) is 0.100 M, what is the concentration of NO2 after 20 minutes?

    asked on February 27, 2018
  12. Chemistry

    What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.75 and has a freezing point of -2.0 ∘C? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)

    asked on March 29, 2017
  13. science

    find the gravitational force exerted by the sun on a 70 kg man located at the earth's equator a)at noon when the man is closest to the sun. b)at midnight when he is futherst from the sun. c)calculate the diferrence in gravitational acceleration due to the

    asked on January 21, 2016
  14. Chemistry

    Please help me set up these problems. I have been staring at them for hours and I can't tell where I went wrong. Question: Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures.

    asked on November 16, 2014
  15. Mathmeta

    How to select logical numbers for mark six?

    asked on June 10, 2019
  16. math

    if the interest rate is 8.25% and you borrowed $5000 for 30 days. How much interest would you pay

    asked on May 19, 2019
  17. Chemistry

    To what decimal place should each answer be rounded? and how many significant figures does the rounded answer have? a) 9cm + 2.8 cm= 11.8cm (unrounded) b) 0.135 atm + 0.6 atm= 0.735 atm (unrounded) PLEASE HELP

    asked on September 11, 2015
  18. Physics

    A train accelerates from the rest at the station A at a rate of 0.8 m/s2 for 25 s, the travels at constant velocity for 77.5 s before it comes to rest at the station B after period of retardation lasting 20 s. What is the distance between stations A and B,

    asked on April 14, 2015
  19. RIGHT TRIANGLE TRIG

    a kite is being flown 150 yards of string. the kite has an angle of elevation with the ground 65 degrees. how high above the ground is the kite. I DON'T KNOW HOW TO SET UP THE PROBLEM

    asked on November 4, 2014
  20. Physics

    A block initially at rest, slides down from the top of an inclined plane 30degrees above the horizontal. The plane is 100feet long and frictionless. what distance will it travel on a frictionless horizontal surface at the foot of the plane 6seconds after

    asked on January 12, 2015
  21. trigonometry

    from a point 3 m above the water surface, the angle of elevation of the top of a certain tree is 30°40', while the angle of depression of its image is 65°10'. Find the height of the tree and its distance from the point of observation.

    asked on December 7, 2015
  22. THEORY OF INTEREST

    Suppose that a money market fund pays a nominal rate of interest of 8.7 percent convertible monthly. What is the equivalent nominal rate convertible quarterly?

    asked on September 30, 2014
  23. college physics

    calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.

    asked on February 14, 2012
  24. Math

    k such that 3 is the remainder when f(x)=x to the 4 power minus 4xcube minus 8xsquare minus 7x plus 1. Tapos which of the following binomial factor of 2xcube plus 5xsquared minus 10x plus 16.

    asked on October 1, 2017
  25. stat

    Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation 9. Develop a 99% confidence interval for the population mean

    asked on December 7, 2015
  26. Physics

    The free-fall acceleration on Mars is 3.7 m/s2. (a) What length pendulum has a period of 4 s on the earth? cm What length pendulum would have a 4 s period on Mars? cm (b) A mass is suspended from a spring with force constant 10 N/m. Find the mass suspended

    asked on December 5, 2010
  27. Chem

    To what decimal place should each answer be rounded? and how many significant figures does the rounded answer have? a) 9cm + 2.8 cm= 11.8cm (unrounded) b) 0.135 atm + 0.6 atm= 0.735 atm (unrounded) can you show me how to do this?

    asked on September 10, 2015
  28. TRIG WORD PROBLEMS

    from 25 feet away from the base of a building, the angle of elevation from the ground to the top of a building is measured 38 degrees. how tall is the building. WHat i did was put 25 feet on the base of the triangle the angle measurement oppsite and the

    asked on November 4, 2014
  29. maths

    Choose the THREE options that define sequences that do not converge. Options A P0 = 40, Pn+1 − Pn = 2.8 Pn (1− Pn/300) (n = 0,1,2, . . .) B P0 = 100, Pn+1 − Pn = 0.7Pn (1− Pn/480) (n = 0,1,2, . . .) C P0 = 250, Pn+1 − Pn = 2.4Pn (1− Pn/420) (n

    asked on May 14, 2011
  30. Physics

    A skier wants to build a rope tow to pull herself up a ski hill that is inclined at 15 with the horizontal. Calculate the tension needed in the rope to give the skier's 54kg body a 1.2 m/s^2 acceleration.

    asked on January 4, 2018
  31. maths

    The variation in size from year to year of a particular population can be modelled by an exponential model with annual proportionate growth rate 0.1246. The size of the population at the start of the initial year is 360. Choose the TWO options that give,

    asked on May 11, 2011
  32. maths

    Choose the option that gives an expression for the indefinite integral ʃ (cos(4x) + 2x^2)(sin(4x) − x) dx. In each option, c is an arbitrary constant. Options A cos(4x) + 2x^2 +c B -1/8cos(4x) + 2x^2)^2 +c C 1/4 (sin(4x) − x)^2 + c D (1/(2 (sin(4x)

    asked on May 11, 2011
  33. Physical Science

    If the density of ice is 0.92 g/cm^3, what percent of an ice cube’s (or iceberg’s) mass is above water.

    asked on April 15, 2009
  34. Math

    When you solve the system shown by the elimination method, which statement is true? y + 3x = 10 −y − 3x = 10 A. You eliminate y; the sum of the coefficients of y is zero. Then, you can solve for x. B. There is no solution; x and y are eliminated and

    asked on January 5, 2016
  35. algebra

    A man and a woman's ages total 98. He is twice as old as she was when he was her age now. What are their ages?

    asked on February 7, 2014
  36. college physics

    calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.

    asked on February 14, 2012
  37. maths

    The variation in size from year to year of a particular population can be modelled by an exponential model with annual proportionate growth rate 0.1246. The size of the population at the start of the initial year is 360. Choose the TWO options that give,

    asked on May 12, 2011
  38. maths

    The method for completing the square can be used to write the expression −2x^2 + 12x−5 in the form a(x + b)^2 + c, where a, b and c are constants. Choose the option that gives the value of c. Options A −23 B −13 2 C 5 2 D 3 E 13 F 14

    asked on May 11, 2011
  39. maths

    The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

    asked on May 11, 2011
  40. Math

    A very large book has pages numbered from 1 to 11521. How many times is the digit 3 printed?

    asked on September 21, 2016
  41. Chemistry

    I'm doing a redox potential/lead acid cell experiment and one of the questions that were asked was: -What were the identities of the gases you saw being produced at the + and - electrodes during the cell conditioning process? We used H2SO4 How do I go

    asked on December 3, 2014
  42. maths

    f(x)=ln(e^x-e^-x), x>0 By applying in turn the Composite and Quotient Rules, find derivative and second derivative. Thanks.

    asked on May 14, 2011
  43. maths

    The variation in size from year to year of a particular population can be modelled by an exponential model with annual proportionate growth rate 0.1246. The size of the population at the start of the initial year is 360. Choose the TWO options that give,

    asked on May 12, 2011
  44. maths

    By first applying the Product Rule, choose the option that gives (correct to two decimal places) the overall maximum value of the function f(x) = e^3x cos(2x) on the interval [1/12 π, 1/4π]. Options A 0.49 B 1.90 C 2.19 D 2.42 E 3.97 F 5.88 G 7.46 H

    asked on May 11, 2011
  45. maths

    Choose the option that gives (correct to two decimal places) the area of the region which is bounded by the x-axis and by the graph of y =(20(7 − x)(x − 3))/x^2 . Options A 0.47 B 1.31 C 2.09 D 3.76 E 5.12 F 6.55 G 8.20 H 9.46

    asked on May 11, 2011
  46. statistics

    The heights in centimetres of men in a sample selected at random may be modelled by a normal distribution with mean 180.5 and standard deviation 11.3. 1. Choose the option that is closest to the value above which 30% of the heights of men will lie. Options

    asked on May 9, 2011
  47. Physics

    A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 28.0 s. (a) How tall is the tower? m (b) If this pendulum is taken to the Moon, where the free-fall

    asked on December 5, 2010
  48. 2nd grade math

    what is mental math and how does it work. the question is use mental math to find the missing numbers. look for the pattern in each chart.the chart ooks like eight boxes two rows of four, the filled in is 0,1,2,3,4the second row is empty, the second

    asked on August 27, 2007
  49. Physics

    g=4 pi (l/t square)

    asked on July 21, 2017
  50. Math

    Solve the system using substitution. 6x + y = 12 4x + 6y = −8 A. (2 1/2,3) B. (−2 1/2,−3) C. (2 1/2,−3) D. no solution I GOT B!

    asked on January 5, 2016
  51. theory of interest

    1.Two investments are made at the same time. The first consists of investing 1550 dollars at a nominal rate of interest of 7.9 percent convertible semiannually. The second consists of investing 1450 dollars at a nominal rate of interest of 7.9 percent

    asked on October 25, 2014
  52. English Analysis

    Reading The Stranger by the lovely Albert Camus. Just need help understanding this question: -After I listed some themes I explored, my teacher asks: "Given the themes you listed, are any conventions questioned based on the treatment of a given theme?

    asked on October 9, 2012
  53. Calculus grade 12

    find dy/dx by implicit differentiation a) xy + x^5y^2 + 3x^3 - 4 = 1 b) lny = cos x thank you

    asked on June 21, 2012
  54. maths

    f(x)=ln(e^x-e^-x), x>0 By applying in turn the Composite and Quotient Rules, find derivative and second derivative.

    asked on May 15, 2011
  55. maths

    The mean weight (1.0042kg)of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be

    asked on May 14, 2011
  56. maths

    A sequence is defined by un = 2×(−0.5)n + 3 (n = 1,2,3, . . .). Choose the option that best describes the long-term behaviour of the sequence. Options A un becomes arbitrarily small (that is, un → 0 as n→∞). B un becomes arbitrarily large and

    asked on May 11, 2011
  57. maths

    Choose the option that gives the solution of the initial-value problem dy dx=(1 + 2 cos2x^2)/y (y > 0), y= 1 when x = 0. Options A y = 1+ 2sin^2 x B y = (1 + 2 sin x)^2 C y = (4x + cos(2x))^2 D y = 4x + cos^2 x E y =sqrt(4x + cos(2x) F y =sqrt(1 + 4x +

    asked on May 11, 2011
  58. maths

    The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

    asked on May 11, 2011
  59. maths

    The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

    asked on May 10, 2011
  60. Math (calculus 3)

    A football is thrown down the field by a quarterback from a height of 1 foot with an initial velocity of 40 feet per second at angle of pi/6 radians. If a receiver catches the ball downfield at a height of 1 foot above ground; a) How long was the ball in

    asked on September 28, 2016
  61. physics

    Phisic

    asked on November 6, 2014
  62. Chemistry Physics

    How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C?

    asked on November 5, 2014
  63. ACT Math

    Carlos goes to a local deli for lunch and orders a sandwich. He needs to choose a bread, a meat, a vegetable, a cheese and a source. How many sandwich combinations are possible? Assume Carlos always pick only one item from each category. Bread: Italian,

    asked on November 13, 2012
  64. Implicit differentiation calculus

    PLEASE HELP , I DON'T UNDERSTAND find dy/dx by implicit differentiation a) xy + x^5y^2 + 3x^3 - 4 = 1 b) lny = cos x thank you

    asked on June 21, 2012
  65. maths

    The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

    asked on May 15, 2011
  66. maths

    The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

    asked on May 14, 2011
  67. maths

    The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

    asked on May 13, 2011
  68. math

    The ticket prices for a movie are shown in the illustration. Receipts for one showing were $1,930 for an audience of 205 people. How many general admission tickets and how many senior citizen tickets were sold?

    asked on May 22, 2017
  69. trigonometry

    can someone help me prove the identities on this: 1- 1/2 sin2θ = sin^3θ + cos^3θ / sinθ + cosθ

    asked on January 21, 2016
  70. trigonometry

    sina^2θcos^2θ= 1/8 (1-cos4θ)

    asked on January 21, 2016
  71. Math

    Solve the system using substitution. x = y − 6 y = 6 − 3x A. (0, 6) B. (6, 0) C. (0, −6) D. (−6, 0)

    asked on January 5, 2016
  72. Math

    Solve the system using substitution. y = 4x − 5 y = 2x + 1 A. (−2, −3) B. (1, 3) C. (−2, −13) D. (3, 7)

    asked on January 5, 2016
  73. Calculus grade 12

    find the slope of the tangent line to y^4 = 3x^2 - 2x at the point (1,1)

    asked on June 21, 2012
  74. math

    $24 lft a 15 percent tip how much total

    asked on May 14, 2012
  75. trig

    1.Ifg(x)=cos4x,find g'(pie/24). 2.Differentiate y=csc^2 pie*x

    asked on February 25, 2012
  76. maths

    The mean weight (1.0042kg)of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be

    asked on May 17, 2011
  77. maths

    The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

    asked on May 17, 2011
  78. maths

    The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

    asked on May 16, 2011
  79. maths

    Choose the THREE options that define sequences that do not converge. Options A P0 = 40, Pn+1 − Pn = 2.8 Pn (1− Pn/300) (n = 0,1,2, . . .) B P0 = 100, Pn+1 − Pn = 0.7Pn (1− Pn/480) (n = 0,1,2, . . .) C P0 = 250, Pn+1 − Pn = 2.4Pn (1− Pn/420) (n

    asked on May 16, 2011
  80. maths

    The mean weight (1.0042kg)of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be

    asked on May 16, 2011
  81. maths

    Choose the THREE options that define sequences that do not converge. Options A P0 = 40, Pn+1 − Pn = 2.8 Pn (1− Pn/300) (n = 0,1,2, . . .) B P0 = 100, Pn+1 − Pn = 0.7Pn (1− Pn/480) (n = 0,1,2, . . .) C P0 = 250, Pn+1 − Pn = 2.4Pn (1− Pn/420) (n

    asked on May 15, 2011
  82. maths

    Choose the THREE options that define sequences that do not converge. Options A P0 = 40, Pn+1 − Pn = 2.8 Pn (1− Pn/300) (n = 0,1,2, . . .) B P0 = 100, Pn+1 − Pn = 0.7Pn (1− Pn/480) (n = 0,1,2, . . .) C P0 = 250, Pn+1 − Pn = 2.4Pn (1− Pn/420) (n

    asked on May 14, 2011
  83. maths

    The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

    asked on May 14, 2011
  84. maths

    The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

    asked on May 14, 2011
  85. maths

    The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

    asked on May 13, 2011
  86. maths

    A sequence is defined by un = 2×(−0.5)n + 3 (n = 1,2,3, . . .). Choose the option that best describes the long-term behaviour of the sequence. Options A un becomes arbitrarily small (that is, un → 0 as n→∞). B un becomes arbitrarily large and

    asked on May 12, 2011
  87. maths

    A ship travels at a constant speed of 25 kilometers per hour (kph) in a straight line from port A located at position (xA, yA) = (−100,−100) to port B at (xB, yB) = (300, 100). (a) (i) Find the equation of the line of travel of the ship. (ii) Find the

    asked on May 9, 2011
  88. physics

    how fast will a object be traveling when drppped from 30 feet high

    asked on April 4, 2011
  89. math163

    Please i need all the process.. thank you.. for the polynomial, list each real zero and its multiplicity. determine whether the graph crosses or touches the x-axis at each x-intercept. f(x)=1/2x^4(x^2-5)(x+1)

    asked on March 1, 2011
  90. math-163

    for the polynomial, list each real zero and its multiplicity. determine whether the graph crosses or touches the x-axis at each x-intercept. f(x)=1/2x^4(x^2-5)(x+1)

    asked on March 1, 2011
  91. chemistry

    A HOT CUP OF COFFEE HAS SOME SUGAR COMLETELY DISSOLVED IN IT. AFTER THE COFFEE HAS COOLED, SOME SUGAR APPEARS AT THE BOTTOM OF THE CUP. EXPLSIN WHAT HAS HAPPENED IN TERMS OF SATURATION.

    asked on February 24, 2011
  92. statistics

    3 different drugs are under consideration for trating a given ailment. in the past 10,000 applications, drug A was sed 2500 times, drug B 4000 times, and drug C 3500 times. when an expert was asked to rank the effectiveness of the 3 drugs, he replied:

    asked on November 12, 2009
  93. math 5th grade

    i need all the prime numbers of 1-100

    asked on November 14, 2008
  94. science

    how does the mantle material get energy to move in convection currents?

    asked on November 14, 2008
  95. PhYsIcS

    A 5 meter, 100 N/m spring is at a 30 degree angle to the horizontal. If a 10 kg weight is placed on the spring when it is compressed 2 meters, how high will it travel?

    asked on November 2, 2008
  96. PRE calculus

    Find the area between each curve and the x-axis for the given interval. y=6x^2+5 from x=0 to x=5 I'm just starting to learn about this and am very confused. Can someone show me how to do this. Thanks. I need help.

    asked on May 14, 2008
  97. Specialist Mathematics

    Need help with three proofs. Proof#1: Prove that |x+y| is less than or equal to |x|+|y| Proof#2: Prove that |x|-|y| is less than or equal to |x-y| Proof#3: Prove that |x+y+z| is less than or equal to |x|+|y|+|z|.

    asked on December 22, 2016
  98. Physics

    Hello, I need some help with this physics problem. This was the only one I couldn't solve, and the teacher wouldn't help me because she wanted me to figure it out for myself, just like everyone else tried. (Although no one did) Here is the question: Type

    asked on November 1, 2016
  99. Math

    A wheel makes6 1/12 revolution per minute. If it rotates 45 minutes,how many revolutions does it make

    asked on April 9, 2016
  100. math

    convert 40.0m^3 to liters. note that 1mL = 1cm^3. can you show me how to do this problem?

    asked on September 10, 2015

Pages

  1. 1
  2. 2