Questions Asked on
April 8, 2017

  1. More Chem

    Consider the combustion of propane. Delta H is -2221 kJ. Assume all heat is from combustion of propane. What mass of propane must be burned in order to furnish this amount of energy assuming the heat transfer process is 60% efficient.

    asked by Victor
  2. Math (Help please!)

    The points plotted on the coordinate plane below are three vertices of a rectangle. ht tp : //imgur dotcom /a/eix1I What are the coordinates of the fourth vertex of the rectangle? (Remove the word "Dot", and put a "." in it's place to access the link, and

    asked by Dejavu
  3. math

    The maturity value of a $28,000, 6%, 60-day interest-bearing note on August 6 is

    asked by leah
  4. Math

    A person walks on the building.He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m. Find the total time taken by him to get on the top of the building.

    asked by Prateekshya
  5. Chem

    A 30 g sample of water at 280 K is mixed with 50 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

    asked by Victor
  6. CHEMISTRY

    How many liters of chlorine gas at 25C and 0.950 atm can be produced by the reaction of 24.0 g of MnO2 with hydrochloric acid? The products include manganese (II) Chloride, water, and chlorine.

    asked by Victor
  7. Physics

    A boat travels at 15 m/s in a direction 45° east of north. The boat then turns and travels at 18 m/s in a direction 5° north of east. What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number. What is the

    asked by Kennedy
  8. Alabama

    gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. Suppose 38.9 g of butane is mixed with 35. g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your

    asked by John
  9. physics

    Two dimensions. In the figure, three point particles are fixed in place in an xy plane. Particle A has mass mA = 4 g, particle B has mass 2.00mA, and particle C has mass 3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three

    asked by fadi
  10. History

    Which is one way the Vietnam War differed from other United States military involvements? A. The decade following the war was economically prosperous. B. There were higher number of American military casualties C. The sole focus of the war was to contain

    asked by failing
  11. Algebra

    solve the equation by completing the square. round to the nearest tenth. x^2+8x=10 A. 1.1, 9.1 B. 1.1, -9.1 C. -1.1, 9.1 D. -1.1,-9.1 my answer is A is that correct

    asked by Cassandra
  12. science

    In which temperature of water did the food coloring diffuse faster?Using your knowledge of the motion of molecules, explain the result

    asked by Young Trippy Lil G
  13. Physics

    Calculate the distance between the two proton such that the electrical repulsive force between them is equal to the weight of either

    asked by Ayushi
  14. Math

    How do you put 0.125,0.1,and 0.12 from least to greatest?

    asked by mya
  15. Algebra

    solve the equation by completing the square. round to the nearest tenth. x^2+8x=10 A. 1.1, 9.1 B. 1.1, -9.1 C. -1.1, 9.1 D. -1.1,-9.1 my answer is A is that correct

    asked by Cassandra
  16. physics

    A swimmer sets off from one bank. The velocity of the swimmer relative to the water is 1.2 m / s at 45° to the river banks, as shown in Fig. 1.1. In the space below, draw a scale diagram to determine the resultant velocity of the swimmer relative to the

    asked by Saeed
  17. Algebra 2

    Given the expression 5a^2b – 13ab + 7a^3 – 4b, do the following as instructed below: Put it in decending order. I got 7a^3+5a^2b-4b-13ab. Is it correct? If not please correct me.

    asked by Marcus Peerbocus
  18. Chemistry Heat

    4Fe + 3O2 ---> 2Fe2O3 Delta H -1652 kJ How much heat is released when 10 g Fe and 2 g O2 are reacted.

    asked by Victor
  19. Physics

    A boat travels at 15 m/s in a direction 45° east of north. The boat then turns and travels at 18 m/s in a direction 5° north of east. What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number. What is the

    asked by Anonymous
  20. math

    Jungle Warehouse signed a 9-month simple discount note with a face value of $5,600. Find the proceeds if the discount rate is 13%

    asked by mac
  21. Science

    What is the mechanical advantage of a machine that used 600N to overcome a load of 1200

    asked by Eric
  22. Program Design and Developmen

    Design a class named TextBook that is a child class of Book. Include a new data field for the grade level of the book and get and set methods for the new field. Provide the pseudocode for the TextBook class Very basic pseudo code is what we're dealing

    asked by alex
  23. Chemistry

    The reaction Fe + Br2 ---> FeBr2 Delta H = -249.8kJ Calculate delta H when 10.0 g of FeBr2 is formed.

    asked by Victor
  24. Chemistry

    So Ag+ + Cl- ---> AgCl and delta H is -65.5 kJ. I'm supposed to calculate delta H when one mole of AgCl dissolved in water, so 1 mol AgCl *(65.5 kJ/1mol Agcl) right? But the answer is 65.5 kJ, and why is it positive, not negative, is my question.

    asked by Victor
  25. math

    Five years ago, A was three times as old as B and ten years later, A shall be twice as old as B. What are the present ages of A and B (in years).

    asked by ravindar
  26. Maths

    Construct a quadrilateral ABCD such that /AB /=4cm, /BC /,=5cm, /AD /=3.5cm and CAB=30°.measure /AB/

    asked by Adeleye charlot
  27. statistics

    A new process is started and the sum of the sample standard deviation for 20 subgroups, of size 8, is 750; Compute, to 3 decimal places, the process standard deviation, σ0:

    asked by Cat
  28. Math

    An atom of gold has a mass of 3.25x10^-22 grams.What is the mass of 8000atoms?Express in scientific notation.

    asked by Nabela
  29. Math

    A person walks on the building. He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m . Find the total time taken by him to get on the top of the building . Please- solve this problem using integers.

    asked by Prateekshya
  30. math

    For each of the following examples: i) Express the negation of the statement using propositional notation, simplifying as much as possible, and ii) Express the statement (and its negation) in words, for the provided propositional functions. (a) ∀x, (p(x)

    asked by Kenny
  31. Math

    A person walks on the building.He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m. Find the total time taken by him to get on the top of the building.

    asked by Prateekshya
  32. Chemistry

    An electron initially in the n = 2 energy level in a hydrogen atom absorbs a photon of light with a frequency of 6.167 x 1014 s-1. Calculate the new energy level the electron will occupy. I am not sure how to being.

    asked by Kim
  33. Math

    A person walks on the building.He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m. Find the total time taken by him to get on the top of the building.

    asked by Prateekshya
  34. Physics

    A river is flowing at 3mps.A man can swim in still water at a speed of 6mps.The angle at which the bank at which the swimmer should start ,so that he may cross the river along the shortest distance is?

    asked by Anonymous
  35. Maths

    Find the length of an arc of a circle of radius 5.6cm which subtends an angle of 60°at the centre of the circle of the circle take pie 22 divided by 7

    asked by Adeleye charlot
  36. Math

    In the year 1997, the surface elevation of Lake Powell was 3887 feet above sea level. In the year 2001, the surface elevation of Lake Powell was 3577.4 feet above sea level. The surface elevation of Lake Powell is at a rate of

    asked by Cindy
  37. Science

    Since no one answered, and I really need help: So I am doing this science experiment about light. I chose to do one where you put a pencil in a glass of water and the light makes it look like it's bending. There is a chart of measurements that you need to

    asked by Reeses
  38. Social Studies

    what religious, economic, and political events led to the development of western Europe?

    asked by Kanda
  39. ORGANIC CHEM QUESTION

    I can't figure out how to draw the structure of beta-valerolactone. Since it's beta I thought it would have a four mem-ring but when I do this I keep getting it wrong. It says the 5 carbons are supposed to be arranged in a linear chain, help please!

    asked by Tessa
  40. basic mathematic

    if Mr Dhaka earn N$ x in a week and spend N$ y, what part of his weekly salary did he save?

    asked by vaino
  41. Maths

    Find the length of an arc of a circle of radius 5.6cm which subtends an angle of 60°at the centre of the circle take pie 22 \7

    asked by Adeleye charlot
  42. Maths

    Factorize completely 16y³+16y² +4y

    asked by Adeleye charlot
  43. Science

    Since no one answered, and I really need help: So I am doing this science experiment about light. I chose to do one where you put a pencil in a glass of water and the light makes it look like it's bending. There is a chart of measurements that you need to

    asked by Reeses
  44. Math

    If 1/6 cup of icing covers 2/3 of a cake, how much icing is needed to cover the entire cake? A. 1/9 B. 1/6 C. 1/4 D. 1/18

    asked by Anonymous
  45. Chrmistry

    What is the percentage recovery if 0.98g of copper is left when reacting 0.5g of copper sulphate with excess zinc?

    asked by Erron
  46. math

    Let f(x) be a twice differentiable function (i.e. f(x), f′(x) and f′′(x) are defined for all x), and let a ∈ R (a is a real number). If f′(a) = 0 and f′′(a) > 0, then a is a strict local minimum of f. (a) Express the second sentence in

    asked by Kenny
  47. Math

    Adeline and Mandy had some money in the ratio 3:7. After Adeline receive $92 and Mandy receive $40, both girls had an equal amount money. How much money did they have at first?

    asked by Kathy
  48. Deduction

    Hello, Struggling to get my head around this. So we have this statement. ----------------------------------- If it rains on Monday then mark will carry an umbrella on Monday. It does not rain on Monday. You deduce: Mark does not carry an umbrella on

    asked by Anon
  49. ENGLISH

    In about (500 words)write a composition ending with "when i woke up i realised that it was only a dream"

    asked by JOHN
  50. Proof by contradiction

    Prove that there exists no positive real number such that: 4x^2+1/4x

    asked by Anon
  51. physic

    the sunlight rae about 46 degree in a tree if the hight of trre is 8 what is length of the shadow

    asked by ramish
  52. physics

    from newton's second law of motion derive the formulae F=ma

    asked by obura
  53. chemistry

    It takes 445.76 J of heat to increase the temperature of a 50.0 g piece of metal from 20.0 °C to 65.0 °C. What is the specific heat capacity of the metal (assuming the phase doesn\'t change)? Also please show work

    asked by Allex
  54. Program Design and Development

    Design a class called SimpleCalculator using psudoecode that contains public methods named add(), subtract(). Each of the methods accepts two numeric arguments and returns a number that represents the result of the appropriate arithmetic operation. Design

    asked by john
  55. chemistry

    what is 1.79 x 10^-20 in kJ/mol?

    asked by Allex
  56. trigonometry

    If cos x = 4/5, 0° x 90°, find the value of (1 + tan x)/(1 - tan x)

    asked by Lucky
  57. Algebra 2

    Let f(x) = 3x^2 – x + 2 and g(x) = 5x^2 – 1. Find f(g(x)). Show each step of your work. I got 75x^4 -35x +6 If that is wrong can you correct me. Thank you!

    asked by Sanjay
  58. Science

    So I am doing this science experiment about light. I chose to do one where you put a pencil in a glass of water and the light makes it look like it's bending. There is a chart of measurements that you need to fill out and I have no idea how to get them. I

    asked by Reeses
  59. calculus

    the vertical displacement y of a boat that is rocking up and down a lake, with y measured relative to the bottom of the lake. It has a maximum displacement of 12 meters and a minimum of 8 meters, a period of 3 seconds and an initial displacement of 11

    asked by umma