jhon

Most popular questions and responses by jhon
  1. Chemistry

    How much energy in kilojoules is released when 25.0 g of ethanol (C2H5OH) vapor at 93.0 C is cooled to -10 C? Ethanol has mp = -114.1 oC, bp = 78.3 oC, ΔHvap = 38.56 kJ/mol, and ΔHfus = 4.93 kJ/mol. The molar heat capacity is 112.3 J/(K.mol) for the

    asked on September 7, 2014
  2. physics

    a 20 kg traveler's bag is being pulled along the floor with a force of 50 NF. the force is applied on the handle forming an angle of 30 degree with the horizontal. neglecting friction,what is the acceleration og the bag? How much force is exerted by the

    asked on November 29, 2014
  3. English

    Which adjective best describes the community's attitude toward Mari Djata's inability to walk in Sundiata? A. fearful B. indifferent C. sympathetic D. mocking B?

    asked on January 12, 2015
  4. i need your help damon

    Jill’s room is 12.5 feet long and 11.5 feet wide. She made a scale drawing of the room with a scale of 0.5 inch = 2 feet. What is the perimeter of Jill’s room in the drawing? A. 12 inches B. 24 inches C. 48 inches D. 96 inches

    asked on January 14, 2016
  5. math

    Many people are trying to reduce their carbon footprint. Amrita’s carbon footprint this year was 85% of last year’s footprint. If her carbon footprint this year is 34 tonnes,what was her carbon footprint last year? PLZ NEED HELP

    asked on November 22, 2013
  6. chem

    Fe + O2--->Fe2O3 How many grams of iron are required to convert 80 mL of oxygen at STP?

    asked on November 4, 2014
  7. Social studies

    How did the Qin dynasty lose the Mandate of Heaven? A.through invasions by nomadic herdsmen the emperor's army couldn't defend against B.through natural disasters the government was unable to cope with C.through famine caused by many years of drought

    asked on February 8, 2019
  8. damon i need your help again

    Julie deposited $300 into a simple interest savings account that earns 1.34%. If no money is added or withdrawn from the account, about how long will it take for the interest to equal the deposited amount? A. 8 months B.

    asked on January 14, 2016
  9. garyson

    A person rides up a lift to a mountaintop, but the persons ears fail to pop –that is, the pressure of the inner ear does not equalize with the outside atmosphere. The radius of each ear drum is 0.40×10ˆ-2m. The pressure of the atmosphere drops from

    asked on December 24, 2011
  10. math

    cotx+tan2x=cotxsec2x prove

    asked on February 14, 2013
  11. math help

    Hayley wants to purchase tile for the floor in a rectangular room that measures 15 feet by 14 feet. The tile costs $4.25 per square foot. Sales tax is 6.5%. What will be the total cost to cover Hayley’s floor with tile?

    asked on January 18, 2016
  12. chem

    A 0.069 gram sample of a metal reacted with HCl and produced 45.31 mL of H 2 gas at 25¡ÆC and 1 atm pressure. The metal is known to react with HCl according to the following reaction, 2 M + 6 HCl > 2 MCl 3 + 3 H 2 What is the molar mass of the metal?

    asked on October 31, 2014
  13. physics

    a 20 kg traveler's bag is being pulled along the floor with a force of 50 NF. the force is applied on the handle forming an angle of 30 degree with the horizontal. neglecting friction,what is the acceleration og the bag? How much force is exerted by the

    asked on November 30, 2014
  14. calculus

    the dimensions of a closed rectangular box are measured as 30 in, 40 in.. and 60 in.. with a maximum error of 0.2 in. in each measurement. use differentials to estimate the maximum error in calculating the volume of the box

    asked on April 1, 2012
  15. Chemistry

    If a 2.6 g of weak diprotic acid were dissolved in 100 mL of water and a 10 mL aliquot of this solution required 21.6 mL of 0.1 M NaOH to reach the first endpoint, what are the equivalent and formula weights of H2A? I think I first need to find the moles

    asked on February 16, 2012
  16. Chemical Engineering

    How much acetone liquid (in mls) is required to produce a vapor concentration of 200 ppm (parts per million) by volume in a room of dimensions 3 x 4 x 10 meters? The temperature is 25oC and the pressure is 1 atm. The following physical property data are

    asked on September 7, 2010
  17. physical science

    A sample of tin (Cp = 0.227 J/g•°C) is placed in a freezer. Its temperature decreases from 15.0°C to −10.0°C as it releases 543 J of energy. What is the mass of the sample? Round your answer to three significant figures.

    asked on June 30, 2017
  18. math help

    Jordan earns $11.35 per hour and works 40 hours per week. He then earns a 20% pay raise. How much money will Jordan now make each week? A $363.20 B $454.00 C $463.08 D $544.80 how is this d

    asked on January 18, 2016
  19. math help

    Mr. Donahue needs 4 1/2 pounds of flour to make 5 loaves of bread. He bought a 50-pound bag of flour that costs $64.99. About how much will Mr. Donahue spend on flour for a loaf of bread? A $1.17 B $5.85 C $6.50 D $58.49 how is this answer A

    asked on January 18, 2016
  20. math help

    Mr. Donahue needs eq177745_s1 pounds of flour to make 5 loaves of bread. He bought a 50-pound bag of flour that costs $64.99. About how much will Mr. Donahue spend on flour for a loaf of bread? A $1.17 B $5.85 C $6.50 D $58.49 how is this on A please

    asked on January 18, 2016
  21. i really need help but dont know how to do it

    Taylor made a scale drawing of his room using a scale of 0.25 inch = 1 foot. On the drawing, the length of his room is 3.25 inches and the width is2.75 inches. What is the area of Taylor’s actual room? A. 36 square feet B. 48 square feet C. 143square

    asked on January 14, 2016
  22. math help

    Mr. Richards has two cars that he changes the oil in every four months. During an oil change, each car needs 4 1/2 quarts of oil. Each 5-quart container of oil costs $14.99. Before tax, how much will the oil cost Mr. Richards for both cars in a year? A

    asked on January 18, 2016
  23. physics

    a pitching machine throws a baseball at a batter with an initial velocity of 22.0 m/s at an angle of 30 degrees to the horizontal. the ball is 1.60 m above the ground when it is pitched. a) if the batter hots the ball at the same height as it was launched

    asked on October 4, 2012
  24. science,physics

    a 5kg bomb exploded into two fragments .If one fragment with 3 kg moves in a direction with 5m/s then what is the velocity of the second fragment of mass 2kg

    asked on September 13, 2016
  25. Normal distribution

    The breaking strength of cable is known to be normally distributtes with a mean of 4000 kg and a standard deviation of 25 kg.The manufacturer prefers that at least 95% of his product meet a strength requirement og 4050 kg.is that requirement being met?if

    asked on December 22, 2010
  26. chemistry

    Molecular shape of BrF3 by VSEPR theory

    asked on August 30, 2010
  27. Science

    An athlete runs on a circular track 7m.calculate the distance and displacement covered by him after 3 rotations?

    asked on September 12, 2016
  28. physics

    A motorboat travels due north at a steady speed of 3.0 m/s through calm water in which there is no current. The boat then enters an area of water in which a steady current flows at 2.0 m/s in a southwest direction, as shown in the next picture. Both the

    asked on August 16, 2012
  29. MATH

    A number has three distinct digits. The sum of the digits equals the product of the digits. How many three-digit numbers satisfy this condition?

    asked on September 3, 2016
  30. English

    Hi, I'm writing a paper for English and my professor crossed off the authors name in one of quotes for the citation of my rough draft as if it was suppose to be there. Something like xxxxxxxxxxxxxxxxxxxxxx (john 59) and she crossed off john as if I wasn't

    asked on October 10, 2011
  31. Perimeter

    Draw a figure with a perimeter of 24, using 11 squares

    asked on April 18, 2010
  32. math help fast

    During an oil change, each car needs 4 1/2 quarts of oil. Each 5-quart container of oil costs $14.99. Before tax, how much will the oil cost Mr. Richards for both cars in a year? A $44.97 B $80.94 C $89.94 D $107.93 why is this c

    asked on January 18, 2016
  33. chemistry

    The following experimental data were obtained for the reaction; 2 NO + 2 H2 ¡æ N2+ 2 H2O Rate/10-5M/s [NO]/10-2M [H2]/10-2M 0.50 0.50 0.20 2.00 1.00 0.20 0.25 0.25 0.40 Write a rate law in agreement with the data. Rate = What is the value and units of

    asked on February 1, 2015
  34. Young Harris College

    How much energy is needed to heat 8.50 g of ice from -30.0 C to 70.0 C? The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(mol.K) for ice and 75.3 J/(mol.K) for liquid water. I got 19.24kJ but it isn't correct!!

    asked on September 7, 2014
  35. calculus(related rates)

    Water is leaking out of an inverted conical tank at a rate of 12200 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 6.5 meters. If the

    asked on May 5, 2012
  36. science

    Where can I find some information about nourvis system and endocrine system?

    asked on December 27, 2010
  37. econ

    Which best describes interest?

    asked on April 26, 2017
  38. economics managerial

    total revenue equation TR = 5000Q – 5Q2 and total cost equation C = 500 + 3Q2 Calculate this firm’s profit maximizing price, quantity, total revenue, total cost, and total

    asked on April 20, 2016
  39. math

    A new automobile costs $23,782, but after one year it is worth $17,668. What is the approximate percent of decrease in the value of the automobile?

    asked on January 14, 2016
  40. logic

    a team of Andres Bruno carlos Daniel and Esteban participated in a tennis doubles tournament so two of one team play against other two It is known that Andres participated in a game Bruno in 2 carlos in 2 Daniel in 3 and Esteban in 4 then the amount of

    asked on February 17, 2014
  41. English

    Is it self plagerism if I take the same argument or main idea from a paper that I wrote last semester and use that same principle/argument/main idea/thesis in another paper for the next semester if it's is completely rewritten with different words and

    asked on December 27, 2011
  42. Perimeter

    Draw a figure with a perimeter of 24 squares, using 21 squares

    asked on April 18, 2010
  43. Algebra

    A cashier has only one dollar bills, quarters,and dimes. List all the ways you could receive $2.50 in change $1 Bills Quarters Dimes Ex. 2 2 0

    asked on September 12, 2017
  44. math

    In five games, you score 16, 12, 15, 13, and 17 points. How many points must you score in the sixth game to have an average of at least 15 points?

    asked on October 27, 2016
  45. computer Science

    1. Create a program which will allow the user enter ten numbers. The program is to count how many numbers were above 50. Hint: You will need to incorporate a Selection (If…then) statement.

    asked on January 25, 2016
  46. classical mechanics

    A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 20.0 cm. The two vertical pipes are open at the top, and the difference in water level between

    asked on January 3, 2014
  47. Computer Science (MATLAB)

    I had a test in my computer science course in which I was asked if any while loop can be replaced with a for loop. I put true. I guess the answer was false. My professor said that if you had a while loop in which you asked the user to input a certain value

    asked on November 1, 2011
  48. sociology

    How does conflict theory and functionalist theory apply to conditions and compensations of the workers in Barbara Ehrenreich's "Nickle and Dimed"?

    asked on October 20, 2009
  49. Algebra

    Find 8 values of c that make the following expression factorable. x^2+3x+c. How did you know?

    asked on March 7, 2018
  50. history

    what about Mohawk interactions with the europeans

    asked on April 18, 2016
  51. math help

    Mrs. Williams is going to purchase a plastic cover for her outdoor fish pond. The area of the fish pond is 25 m2. However, she must purchase a cover that is 12% more than the pond area in order to cover the entire edges of the pond. The plastic cover costs

    asked on January 18, 2016
  52. ALGEBRA

    A rectangular garden is 30 ft wide. If its area is 2700 ft{}^2, what is the length of the garden?

    asked on September 19, 2015
  53. chemistry

    If you wanted to make a barometer that had a column of liquid about 6 feet tall, what would the density of the liquid have to be? 1 meter = 3.28 ft 1 inch = 2.54 cm Density Hg = 13.6 g/mL 1atm = 760 torr

    asked on October 12, 2014
  54. logic

    100 days after a sunday will be a day a Sunday b Tuesday c thursday d monday

    asked on February 17, 2014
  55. logic

    in a bike competition with 21 laps was observed that 13% quit before 5 laps, 17% quit later than 5 laps but less than 15, and the others 210 finished the competition the number of bikers that quit before the 5 lap were: a) 27 b) 39 c) 43 d) 56

    asked on January 10, 2014
  56. logic

    the rectangle represented the AB side is 4cm the side BC is 6 cm i want to build a triangle taking the AB segment and the third vertice inside the triangle so his area becomes higher than 8 cm*cm. the area in cm*cm of the region of the rectangle in which

    asked on January 10, 2014
  57. calculus

    find the approximate change in z when the point (x,y) changes from (1,1)to (1.01, 0.90) f(x,y) = xe^(-y) + ye^(-x)

    asked on April 1, 2012
  58. Computer Science (MATLAB)

    I had a test in my computer science course in which I was asked if any while loop can be replaced with a for loop. I put true. I guess the answer was false. My professor said that if you had a while loop in which you asked the user to input a certain value

    asked on November 1, 2011
  59. Computer Science (MATLAB)

    Given a vector of values of zeros and ones such as [1 0 1 0 0 0 1 0] I'm asked to, given a probability provided by the user, use that probability to change the values in the vector using that probability. For example given the vector [0 1 0 0 0 1 0 0 0 1]

    asked on October 18, 2011
  60. science

    Can you give me awebsite about phase change?

    asked on January 17, 2011
  61. social studies

    Where can I find some information about native americans

    asked on December 12, 2010
  62. physical science

    How much work is done by the gravitational force on an object of mass 9.40 kg that is initially at rest when it falls down for a time of 1.85 seconds. Ignore air resistance

    asked on December 21, 2009
  63. Math

    An electric dentist chair lifts ruth,110,0.3 meters in 10 seconds what is the power developed by this chair?

    asked on December 2, 2015
  64. trigonometry

    find the radius of a circle in which a 59 foot chord subtends an angle of 12 degree at the center

    asked on September 16, 2015
  65. physics

    If you wanted to make a barometer that had a column of liquid about 6 feet tall, what would the density of the liquid have to be? 1 meter = 3.28 ft 1 inch = 2.54 cm Density Hg = 13.6 g/mL 1atm = 760 torr

    asked on October 12, 2014
  66. logic

    CLaudia has 4 task to do go to the market, study, clean , sport it is known - go to the market if study - study if she does not clean - if she does not clean then she goes to the market a 15% b 12% c 10% d 24%

    asked on February 17, 2014
  67. logic

    a survey of three marks of soda has -of 100 people 83 drinks at least 1 of 3 marks -54 just drink 1 -19 drinks 2 of 3 between the people the % that drink the 3 are a 15% b 12% c 10% d 24%

    asked on February 17, 2014
  68. logic

    In a soccer tournament between four teams A,B,C,D wich was free for all the scores were A 4 points B 4 points C 3 points D 1 point In this tournament the winner gets 2 points, the draw 1 point the looser 0. It is known that each team has a goal so. 1 The

    asked on February 17, 2014
  69. logic

    Camilo, Diego, Esteban transport on their bikes apples, the way was splitted in two parts to handle the weight. In the first step for each 6 apples that carries Camilo diego carries 5 Esteban 4, in the second step for each 2 apples tath carries Camilo,

    asked on January 10, 2014
  70. logic

    the rectangle represented the AB side is 4cm the side BC is 6 cm i want to build a triangle taking the AB segment and the third vertice inside the triangle so his area becomes higher than 8 cm*cm. the area in cm*cm of the region of the rectangle in which

    asked on January 10, 2014
  71. math

    Please show all of your work in the space below. Please present and organized and complete solution. A garden will be made up of a parallelogram, a rectangle and a triangle. The garden must have an area of 500m square. Draw two possible gardens. Determine

    asked on November 22, 2013
  72. math

    a drawing of a deck has a scale of 1 inch to 5 feet. the actual deck is 18 feet long.how long is the deck in the scale drawing?

    asked on May 3, 2012
  73. Computer Science (MATLAB)

    Given an arbitrary one dimensional vector v imputed by the user for example v='Helllllloooooo' or v='Helo' I was able to append empty characters onto any one dimensional vector that the user can enter so that way the total length of the vector is a

    asked on November 14, 2011
  74. science

    the last question i do not get can one of y´all help me out lisa is working on a science project her task is to answer the question ¨does rogooti(which is a commerical hair product) affect the speed of hair growth control group: independent variable:

    asked on September 1, 2011
  75. 9 th grade geomitry

    how do you do 19= n - 9 ??????

    asked on September 9, 2010
  76. Math

    34÷ 45=_

    asked on January 9, 2018
  77. math

    Compare each pair of numbers. Use . greater than 3/5 and 5/8

    asked on October 17, 2017
  78. chemistry

    Hess¡¯ law says that when we add reactions together we can also add the enthalpies. Given the following set of reactions, use Hess¡¯ Law to calculate the enthalpy of the reaction given below. N2H4 + H2 ¡æ 2 NH3 ¥ÄH¡Æ = ? N2 + 3 H2 ¡æ 2 NH3

    asked on April 26, 2015
  79. chemistry lab

    If a portion of your aspirin sample had broken down, how would that effect the total amount of base used? What would the effect be on the percentage of aspirin in your sample?

    asked on October 25, 2014
  80. Logic

    Claudia has four home works to do, go to the market, study for the exam, clean the room, and practice sports, she knows that: -she goes to the market if she studies for the exam. -she studies for his exam if she does not clean his room -if she does not

    asked on January 3, 2014
  81. science

    can you tell me a website on elements

    asked on January 28, 2011
  82. science

    Can you give me a website about attoms

    asked on January 15, 2011
  83. 7th grade english

    Is it possible to find a antonym for a noun

    asked on December 29, 2009
  1. algebra

    It’s really hard

    posted on April 15, 2019
  2. Social studies

    That's you're correct! It helps alot!

    posted on February 8, 2019
  3. math

    Hello, I'm sorry but I got a 6/17 and this is totally not okay. I was checking my answers and totally changed them because of this and it did not work at all. These answers are completely wrong

    posted on May 8, 2018
  4. ENG1010

    b

    posted on March 18, 2018
  5. algebra

    solve 4(7x - 4) = 124

    posted on November 20, 2017
  6. Math

    a 100 pound person would weigh 20 pounds on lo, a moon of jupiter. a person weighing 150 pounds would weigh 25 pounds on the moon. use ratio tables to determine which moon would make a person weigh the most

    posted on November 15, 2017
  7. Physics

    fdf

    posted on August 27, 2017
  8. Social Studies

    he is right

    posted on April 25, 2017
  9. English

    If a writer wanted to put emphasis on the person doing an action, which of these statements would be the best choice? A) active voice B) passive voice C) subjunctive mood D) interrogative mood

    posted on April 8, 2017
  10. Language Arts

    thanks i play mincraft

    posted on March 29, 2017
  11. LA HELP/CHECK!

    yes these are all correct

    posted on March 27, 2017
  12. math

    yes its true

    posted on January 30, 2017
  13. geometry

    Given m = 10 and n = 9, the ratio of n to m is 10/9. True False

    posted on January 24, 2017
  14. math

    Actually it is 2.07 because 17.97+25.49 is 43.46 and 43.46+0.33 is 43.79 then subtract 50.00 and 43.79 then you divide 6.21 from 3 and you will get 2.07

    posted on December 8, 2016
  15. history

    happyness

    posted on April 18, 2016
  16. math

    2 Lucy spread a tablecloth in the grass beside the millpond.

    posted on March 15, 2016
  17. computer literacy

    file explorer

    posted on February 27, 2016