Most popular questions and responses by Tanya
  1. history

    the reign of terror was a necessary evil discuss

    asked on June 22, 2015

    At 25°C and 730 mm pressure,380 ml of dry oxygen was collected.If the temperature is constant ,what volume will the oxygen occupy at 760 mm pressure ? ANSWER- 365ml

    asked on March 22, 2015
  3. math

    The scale of the map is missing.The actual distance from Liberty to West Quall is 72 miles,and it is 6 inches on the map. (A)What is the scale of the map? (B)Foston is between Liberty and West Quall and is 4 inches from Liberty on the map.How far is Foston

    asked on January 15, 2015
  4. Chemistry

    0.24g of a volatile substance,upon vaporisation,gives 45ml vapour at NTP what will be the vapour density of the substance?

    asked on March 22, 2015


    asked on April 10, 2014
  6. chemistry

    how much heat is required to vaporize 343g of liquid ethanol at its boiling point?

    asked on March 25, 2013
  7. Chemistry

    Hydrazene can be used in fuel cell N2H4(aq)+o2(g)->N2(g)+2H2O(l) IfΔG°for this reaction is -600kj what will be the E°for the cell?

    asked on May 27, 2015
  8. statistics

    The ages of commercial aircraft are normally distributed with a mean of 13.0 years and a standard deviation of 7.5 years what percentage of individual aircraft have ages greater than 15 years assume that a random sample of 49 aircraft is selected and the

    asked on April 24, 2012
  9. statistics help...please

    i have no idea! The real estate assessor for a country government wants to study various characteristics of single family houses in the country. A random sample of 70 houses reveals the following: the mean is 1759, standard deviation is 380 and 42 houses

    asked on April 3, 2008
  10. Chemistry

    Exactly 100 mL of 0.14 M nitrous acid (HNO2) are titrated with a 0.14 M NaOH solution. Calculate the pH for the following. (a) the initial solution (b) the point at which 80 mL of the base has been added (c) the equivalence point (d) the point at which 105

    asked on March 17, 2012
  11. Calculus

    a) Estimate the area under the graph of f(x)=7+4x^2 from x=-1 to x=2 using three rectangles and right endpoints. R3= ???? Then improve your estimate by using six rectangles. R6= ????? Sketch the curve and the approximating rectangles for R3. Sketch the

    asked on April 23, 2014
  12. physics

    a sled slides down a frictionless hill. if the sled starts from rest at the top, its speed is 7.5 m/s. a.) on a second run , the sled starts with a speed of 1.5 m/s at the top.. will it end with less than 9 m/s, 9 m/s, or more than 9 m/s b.) find the speed

    asked on December 2, 2009
  13. chemistry

    A|A+3(0.1)||B+2(0.01m)|B GIVEN E°A|A+3=0.75v E°B|B+2=0.45v

    asked on May 27, 2015
  14. Calculus Help Please!!!

    In a murder investigation, the temperature of the corpse was 32.5 C at 1:30pm and 30.3 C an hour later. Normal body temperature is 37.0 C and the temperature of the surrounding was 20.0 C. When did the murder take place? PLEASE SHOW STEP BY STEP

    asked on March 27, 2014
  15. Physics Help Please --- Urgent

    A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an insect is now placed 16 cm from this lens, how far FROM THE INSECT will its image be formed? A) 64 cm B) 72 cm C) 32 cm D) 96 cm E) 48 cm

    asked on May 2, 2015

    A gaseous mixture was prepared by taking equal mole of CO and N2 .if the total pressure of the mixture was found 1 atmosphere ,the partial pressure of nitrogen (N2) in the mixture is.

    asked on March 22, 2015
  17. Chemistry

    For the reaction shown, compute the theoretical yield of the product in grams for each of the following initial amounts of reactancts 2Al(s) + 3Cl2(g) = 2AlCl3(s)

    asked on July 12, 2009
  18. Algebra

    Use the formula h= -16t^2+250t to model the height 'h' in feet of a model rocket 't' seconds after it has luanched. Determine when the rocket will reach a height of 900 feet.

    asked on April 15, 2008
  19. math

    A water heater has a diameter of 18 inches. It sits in a drain pan that has a diameter of 22 inches and a height of 2 inches, as modeled in the diagram below. Water that leaks out of the water heater sits in the drain pan. Which of the following is closest

    asked on March 19, 2014
  20. High Point

    a sign is in the shape of rhombus with a 60 degree angle and sides of 9cm long. Find its are to nearest tenth?

    asked on January 24, 2012
  21. Chemistry :/

    A 10.231-g sample of window cleaner containing ammonia was diluted with 39.466 mL of 0.1063 M HCl to reach the bromocresol green end point. Find the weight percent of NH3 (FM 17.031) in the cleaner.

    asked on January 23, 2012
  22. calculus help

    Evaluate!!!! integral -10 to 10 ((2e^x)/(sinhx+coshx))dx Thanks!

    asked on May 8, 2014
  23. chemistry

    For each of the following unbalanced equations, indicate how many moles of the first product are produced if 0.625 mol of the second product forms. State clearly the mole ratio used for each conversion. CH3CH2OH(l) + O2 --> CH3CHO(aq) + CH3CHO(aq) + H2O(l)

    asked on January 9, 2010
  24. physics

    a cylinder of diameter 1cm at 30degree celcius is to slid into a hole on a steel plate. the hole has a diameter of 0.9997 cm at 30 degree celcius. to what temperature must be the plate be heated when steel has the alpha 1.1X10^-5/degree celcius

    asked on September 2, 2011
  25. statistics

    In a recent​ season, the population standard deviation of the yards per carry for all running backs was 1.241.24. The yards per carry of 25 randomly selected running backs are shown below. Assume the yards per carry are normally distributed. 1.81.8

    asked on November 22, 2015
  26. College Math 3

    Lisa will rent a car for the weekend. She can choose one of two plans. The first plan has an initial fee of $53.98 and costs an additional $0.15 per mile driven. The second plan has an initial fee of $67.98 and costs an additional $0.10 per mile driven.

    asked on March 4, 2011
  27. Calculus Help Please Urgent!!!

    Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 3 s. The maximum rate of air flow into the lungs is about 0.3 L/s. This explains, in part, why the function f(t) = (3/10)sin(2πt/3) has

    asked on May 1, 2014
  28. statistics

    Breast feeding sometimes results in a temporary loss of bone mass as calcium is depleted in the mother's body to provide for milk production. An investigation gave the following data on total body bone mineral content (g) for a sample of mothers both

    asked on June 28, 2012
  29. chemistry

    In a zero order reaction ,20% of the reaction complete in 10s .How much time it will take to complete 50% of the reaction?

    asked on May 27, 2015
  30. Physics Help Please --- Telescope

    An astronomical refracting telescope is made from two lenses. the objective lens has a focal length of 114 cm, and the eyepiece lens has a focal length of 17 cm. a) What is the total length of the telescope? b) What is the angular magnification of the

    asked on May 2, 2015
  31. solving algebraic equation

    For college orientation week,Mike sold 200 shirts.sweat shirts were priced at $50.00 each ant t-shirts at $20.00 each Mike receive a total of $6250.00 for the shirts. How many type of shirt dud Mike sell for college orientation week ?please help and show a

    asked on February 8, 2012
  32. Math

    a rectangle of board measures 21 m by 70 cm. Circular plates are to be cut from the board of diameter 14 cm. how many plates and board is left

    asked on January 16, 2017
  33. statistic

    Quiz has 6 questions. Each question has five possible answers, only one of each 5 answers is correct. If student randomly guesses on all six questions, what is the probability to answer 2 questions right? Tip: first, you have to define parameters of

    asked on December 4, 2010
  34. Statistics...help

    An article claimed that the typical supermarket trip takes a mean of 22 minutes. suppose that in an effort to test this claim, you select a sample of 50 shoppers at a local supermarket. the mean shopping time for the sample of 50 shoppers is 25.36 min.

    asked on April 3, 2008

    The average kinetic energy of an ideal gas,per molecule in S.I units at 25°C will be

    asked on March 22, 2015
  36. chemistry

    2NH3+H2SO4---> (NH4)2SO4 Calculate the mass of ammonia required to produce 125g of ammonium sulfate.|:

    asked on March 31, 2010
  37. Chemistry

    What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for use in a car's radiator that freezes at -23.3 degrees Celsius? Assume the density for water is exactly 1 g/mL

    asked on January 18, 2009
  38. math

    The demand function for a certain commodity is approximated by: p = 100e-q/2where "q" is the number of units demanded at a price of "p" dollars per unit. If there is no demand for the product, what will its price be(in dollars)?

    asked on April 3, 2012
  39. Math

    A man spend one third of his wages on food and one fifth on rent. A. What fraction does he spend on food and rent together? B. What fraction of his wages is left to spend on other things? C. If in a month the same man spend $450 on food, what is his

    asked on June 10, 2019
  40. Physics

    Two spheres with masses of 5.00 g and 10. kg respectively are .500 m apart. calculate the force of attraction between them.

    asked on January 22, 2014

    A proton is traveling to the right at 231 km/s. It has a head-on perfectly elastic collision with a carbon atom. The mass of the carbon atom is 12 times the mass of the proton, what is the speed of proton after the collision?

    asked on March 17, 2011
  42. physics

    In introductory physics laboratories, a typical Cavendish balance for measuring the gravitational constant G uses lead spheres of masses 1.79 kg and 16.9 g whose centers are separated by 5.49 cm. Calculate the gravitational force between these spheres,

    asked on December 10, 2011
  43. Physics

    Which of the following is the correct relationship between the electric field strength and the potential difference?

    asked on May 31, 2013
  44. verbal linear equations

    a taxi costs $2.75 for the first quarter of a mile and $0.85 for each subsequent quarter mile.A ride that cost $23.15 is how many miles longer than a ride that costs $17.20?(please i don't want example show me how u work it out )

    asked on February 5, 2012

    Two gases A and B having the same volume diffuse through a porous in 20 and 10 seconds respectively .The molecular mass of A is 49u.Molecular mass of B will be

    asked on March 23, 2015

    The pressure exerted by 6.0g of methane gas in a 0.03m3 vessel at 129degreeC is.

    asked on March 22, 2015
  47. physics

    A model airplane of mass 0.7 kg is attached to a horizontal string and flies in a horizontal circle of radius 5.6 m, making 1.6 revolutions every 7 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the

    asked on December 10, 2011
  48. math

    charlene takes the bus to work in the morning, then walks home for lunch, walks back to work, and finally walks home in the evening. The distance one way is 600 meters. How far does she walk each day between home and work? 1.2 kilometers 1.8 kilometers 180

    asked on November 7, 2015
  49. chemistry

    CHEMICAL KINETICS The rate of reaction 2N₂O5->4NO₂+O₂ can be written in three ways -d[N₂O5]/dt= k[N₂O5] d[NO₂]/dt= k'[N₂O5] d[O₂]/dt =k"[N₂O5] The relationship between k and k' and between k and k" are ?

    asked on May 28, 2015
  50. Chemistry

    Calculate whether or not a precipitate will form if 1.30 mL of 0.80 M NH3 are added to 2.2 L of 1.0 10-3 M FeSO4. Calculate Q.

    asked on March 16, 2012
  51. Math

    write the logarithmic equation in exponential form log0.001=-3

    asked on August 4, 2011
  52. Chemistry

    the rate of diffusion of a gas having molecular weight just double of hydrogen gas is 30 ml/s.the rate of diffusion of hydrogen gas will be

    asked on April 2, 2015
  53. Stat help

    An article claimed that the typical supermarket trip takes a mean of 22 minutes. suppose that in an effort to test this claim, you select a sample of 50 shoppers at a local supermarket. the mean shopping time for the sample of 50 shoppers is 25.36 min.

    asked on April 3, 2008
  54. Science

    water is flowing through a horizontal pipe of varying cross section at any two places the diameters of the tube are 4cm and 2cm if the pressure difference between these two places be equal to 4.5cm then determine the rate of flow of water in the tube

    asked on September 10, 2016
  55. physics

    A 2.5 kg mass weighs 23.75 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10 6 m.Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10−11N · m2/kg2

    asked on December 11, 2011

    A plane, flying horizontally at an altitude of 1 km and a speed of 500 km/hr, passes directly over a radar station. find the rate in km/hr at which the distance from the plane to the station is changing when it is 2 km away from the radar station. Hint:

    asked on April 24, 2014
  57. computers

    What are contributing factors if you were in the market for commercial paper prior to a final purchase?

    asked on February 24, 2011
  58. math

    Given the expression (3s-4)(4s+5), explain in words the steps taken to completely simplify the expression

    asked on January 16, 2011
  59. Maths

    A survey conducted with 30 students revealed that:20 has cell phone 16 has tsblets 4 has neither 2x has both...calculate the value of x

    asked on December 6, 2016
  60. American national government

    In brown v board of education Yvette supreme court overturned purest v Ferguson because it concluded that

    asked on July 3, 2014
  61. Physics

    On a playground slide, a child has potential energy that decreases by 1000 \rm J while her kinetic energy increases by 900 \rm J. What other form of energy is involved, and how much?

    asked on September 28, 2012
  62. help math

    solve each of the following quadratic equation (1)x^2=5x+6 (2)x^2+9x=10

    asked on February 15, 2012
  63. help in math

    solve and check each of the following quadratic equation (1) x^2=6x (2) x^2=3x (3)x^2=17x (4) x^2=5x+6 (5) x^2+9x=10

    asked on February 15, 2012
  64. quadratic equation

    solve and check each of the following quadratic equation (1)x^-9x=0 (2)x^+8x=0 (3)x^=6x (4)x^=-3x

    asked on February 15, 2012
  65. computer programming

    Design a program that asks the user to enter a nonegative integer and then display the factorial of that number- it can be a flowchart or pseucode

    asked on March 18, 2011
  66. spanish

    What is the tourism like in El Salvador? Thank you for using the Jiskha Homework Help Forum. Here are some sites for you to visit: 1. http://www.lonelyplanet.com/worldguide/destinations/central-america/el-salvador 2.

    asked on May 15, 2007
  67. math

    the distance between new york city and boston is 189.9 miles as the crow flies. how far is it in kilometers? 117.7 kilometers 305.7 kilometers 417.8 kilometers 1,899 kilometers

    asked on November 7, 2015
  68. chemistry

    The edge length of face centered unit cubic cell is 508pm.if the radius of the cation is 110 pm,the radius of anion is

    asked on July 7, 2015
  69. physics

    an elevator motor provides 45 W of power while lifting a 2000 kg elevator 35 m. if the elevator contains six passengers of the same mass and it takes 20.0 to accomplish this task, determine pass of each passenger.

    asked on January 12, 2013
  70. Math

    The perimeter of a square is f feet. How long in yards is each side of the square?

    asked on September 26, 2012
  71. physics

    In the design of a supermarket, there are to be several ramps connecting different parts of the store. Customers will have to push grocery carts up the ramps. A grocery cart has a mass of 30kg. The coefficient of friction is .10. Assume that the shoppers

    asked on September 11, 2012
  72. chemistry

    how many grams of hydrogen are produced if you have 120 grams of sodium? 2Na+2H2O->2NaOH+H2

    asked on February 13, 2012
  73. solving algebraic equation

    a movie theater charges $9 for an adults ticket and $5.00 for a child ticket. on a recent night the sale of child's tickets was two times the sale of an adults tickets. if the total amount collected for ticket sales was not more than $3800 what is the

    asked on February 8, 2012

    Two objects are connected by a massless string as shown in the figure below. The pulley is massless and rotates without friction. The object of mass m = 1.7 kg slides without friction on an inclined plane which makes an angle of è = 38° with the

    asked on March 17, 2011
  75. statistics - math

    Sixty percent of the students at a particular community college are female. If 13 students at that community college are selected at random, find the probability that 5 or 6 students will be female. Use Appendix Table or Excel function for Binomial

    asked on December 4, 2010
  76. 1st grade

    my 1st grader is completing his homework it says write a problem for the picture and it has a picture of 2 bones and 3 dogs what kind of answer are they looking for?

    asked on September 27, 2010
  77. Pre Calc

    sin^2(x) - cos^2(x) = 1 + cos(x) the answer is equal to or greater than 0 and less than 2 pi

    asked on January 10, 2010
  78. psychology

    The observational learning approach states that stereotypes and prejudices are acquired through what? repressing of wants and needs excessively experiencing maturation of innate ideas watching and imitating a model’s behavior pairing conditioned and

    asked on December 20, 2009

    Greek educators, religious reformers,scientist of intellectual revolution, political philosophers constructed the door through when the pilgrims entered the new world when they arrived. [Critically analyze] who are the Greek educators? who are the

    asked on March 7, 2016

    An object of mass M is divided into two parts ,which are placed at distance d.if gravitational force of attraction is maximum between parts,then find the ratio of mass of both parts

    asked on April 3, 2015
  81. physics

    A box of books weighing 324 N is shoved across the floor by a force of 527 N exerted downward at an angle of 35 below the hori- zontal. The acceleration of gravity is 9.81 m/s2 . If μk between the box and the floor is 0.59, how long does it take to move

    asked on October 15, 2012
  82. math

    wats the positive root of the equation x^-3x=10?

    asked on February 15, 2012
  83. maths

    Christopher has cut three pieces of string to three kites.two pieces are equal length. rhw third pieces is one half of the lenght of each of the others. he cut out the three pieces from a roll of string 70 meters long without any String left over.Find the

    asked on February 5, 2012
  84. History

    what were the roman laws called that applied to all citizens in the roman empire

    asked on January 7, 2012
  85. physics

    An air puck of mass 0.33 kg is tied to a string and allowed to revolve in a circle of radius 1.12 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 1.1 kg is tied to it. The

    asked on December 10, 2011
  86. Chemistry

    What is the value of Kp for the reaction: NO2(g)+CO(g)->NO(g)+CO2(g) Given the following information: 2NO2(g)->NO3(g)+NO(g) Kp=2.72x10^(-4) 2NO2(g)+2CO2(g)->2NO3(g)+2CO(g) Kp=5.73

    asked on November 27, 2011
  87. Math

    A student is taking a multiple choice exam. There are five possible answers for each question. What is the probability the student will answer the first question correctly? What is the probability that the student will answer the first question

    asked on November 19, 2011
  88. chem

    why do good oxidizing agents easily reduce? Good (strong) oxidizing agents are easily reduced. What you said I think differs slightly from that. If they are strong oxidizing agents, they easily oxidize other ions and in doing so the oxidizing agent is

    asked on December 4, 2006
  89. math

    A person that is 1.6 m tall casts a 4 m shadow. At the same time, a nearby tree casts a 12 m shadow. What is the height of the tree to the nearest tenth of a metre?

    asked on November 4, 2016
  90. financial management

    Barclays bank has agreed to give Dumisani a loan of $250 000 on the following conditions: a) 16% interest rate compounded monthly b) Dumisani will have to pay back 12 equal installments each at the end of each quarter. Determine the value of each

    asked on May 18, 2016
  91. Chemistry

    You are using concentrated hydrochloric acid solution (12.0 M)to make 445.0 ml of a 5.85 M solution. Calculate the number of milliliters of concentrated HCl required to make the solution.

    asked on March 7, 2013
  92. Math

    Jake ate seven times more jelly beans as Sam. Together they ate 128 jelly beans. How many jelly beans did each person eat?

    asked on February 11, 2013
  93. american government

    Which of the following is characteristic of a capitalist economic system? a. free enterprise b.self-reliance c.private property d.individualism e.all of the answers are correct

    asked on December 30, 2012
  94. Physics

    if you were on a 22.7 degree slope and an avalanche started 425 m up the slope, how much time would you have to get out of the way, there is no friction.

    asked on October 15, 2012
  95. algebra

    find x and y 5x-3y=-4 3x+2y=9

    asked on January 31, 2012
  96. physics

    A 2.5 kg mass weighs 23.75 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10^6 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10^−11N · m2/kg2. Answer

    asked on December 10, 2011
  97. spanish

    do anyone have the answer for penn foster exam 38981200 part 4 comprehension

    asked on September 26, 2011
  98. Finance

    a corporation had year end 2004 and 2005 retained earnings balances of $320,000 and $400,000, respectively. The firm reported net profits after taxes of $100,000 in 2005. the firm paid dividends in 2005 ofwhat

    asked on August 11, 2011
  99. math - statistics

    Football team makes in average 2 touchdowns per game. Use Poisson distribution to find probability that this team will make 5 touchdowns in the next 3 games (adjust ë) Tip: use Poisson Appendix Table or Excel function Poisson(x, ë, false) for x=5 and ë

    asked on December 4, 2010
  100. Algebra

    Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 60 mph, train B is traveling at 70 mph. Train A passes the station at 10:15pm. If train B passes the same station at 10:45pm at what time will train B catch

    asked on February 16, 2010


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