# walter

Popular questions and responses by walter
1. ## Science/Math

A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that included the word problem is:

2. ## Chemistry

From the following data at 25°C, H2(g) + Cl2(g) → 2HCl(g) ΔH0 = −185 kJ 2H2(g) + O2(g) → 2H2O(g) ΔH0 = −483.7 kJ Calculate ΔH0 at 25°C for the reaction below. 4HCl(g) + O2(g) → 2Cl2(g) + 2H2O(g)

3. ## Biomechanics

A pitched ball with a mass of 1 kg reaches a catcher's glove traveling at a velocity of 28 m/s. How much momentum does the ball have? how much impulse is required to stop the ball? If the ball is in contact with the catcher's glove for 0.5 s during the

4. ## Physics

A small rock is thrown vertically upward with a speed of 13.0 m/s from the edge of the roof of a 20.0 m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. A.) What is the

5. ## math

mr. Carr is installing wall to wall carpeting in a room that measures 12 1/2ft by 9 2/3 ft how much will it coast if the carpet is \$26 per square yard

6. ## modern physics - relativity

A photon of energy E collides with a stationary particle of rest mass m0 and is absorbed by it . (A) what is the velocity of resulting composite particle ? (B) What is the mass of the resulting composite particle ? use conservasion of energy / momentum

7. ## Science

a layer of ice has an area of 35m2 and is 2.5cm thick and is -7.5'c. how much water (in kilograms) is needed to melt the ice?

8. ## Science/Math

Word Problems pages 18-19 A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that

9. ## maths

factorise the following equation 680x3-1407x2-614x+285 where x2 x3 mean x to the power of

10. ## chemistry

Aspirin is a monoprotic acid called acetylsalicylic acid. Its formula is HC9H7O4. A certain pain reliever was analyzed for aspirin by dissolving 0.311 g of it in water and titrating it with 0.0398 M KOH solution. The titration required 22.32 mL of base.

11. ## physics

A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 180 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity

12. ## math

i am a number between 5 and 10. my decimal is in tenths. the sum of my digits is 10. what number could i be?

13. ## Chemistry 104

A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)

14. ## Chemistry 104

A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)

15. ## chemistry

For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d)

16. ## chemistry

For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d)

17. ## relativity

Show that the following process is dynamically inpossible: A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e).Explain in detail, How can this this process be made possible? In this case, what is the

18. ## Basic Math

I need help adding fractions with different denominators. Here is the problem... 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 I can see that the demoninators increase. Since they are both addition and subtraction, how do I do this problem? Thanks, Walter, New York.

19. ## Math

start with the word RODE. change one letter at a time to form a new until u have the word FILM. the best solution has the fewest steps.

20. ## chemistry

Given the equilibrium system PCl5(g) PCl3(g) + Cl2(g) K = 12.5 at 60 degrees Celsius. A 1.0-L reaction vessel is analyzed and found to contain 3.2 mol Cl2(g), 1.5 mol PCL3(g) and 3.0 mol PCl5(g). Show that the reaction mixture has not yet reached

21. ## maths

solve the following equation for x

22. ## chemistry

write a balanced chemical equation for calcium nitate plus sulfuric acid produces calcium sulphate and ? This is a metathetical reaction, I think more properly called a double displacement reaction now. Just change + and - partners. Ca(NO3)2 + H2SO4 ==>

23. ## problem solving

25 Miles Long After 2 Hours John Has Run 7 Miles. How Many Miles, M Does John Have Left To Run?

24. ## physics

You throw a snowball at an angle of 34.0° below the horizontal from the roof of a building that is 74.0 m above flat ground. The snowball hits the ground a distance of 44.0 m from the base of the building. Assume free fall with up as positive, and use g =

25. ## phy

A young man is throwing rocks gently up to his girlfriend's window, and he wants the rocks to hit the window moving only with a horizontal component of velocity. He is standing at the edge of a flower bed h = 7.9 m below her window and d = 9.0 m from the

26. ## physics

An object is launched at a speed of 15 m/s. If it rises to a height of 2 m, at what angle was it launched?

27. ## chemistry

"Stomach acid" is hydrochloric acid. A sample of gastric juice having a volume of 6.68 mL required 13.90 mL of 0.0161 M KOH solution for neutralization in a titration. What was the molar concentration of HCl in this fluid? C(HCl) = If we assume a density

28. ## chemistry

A student prepares a solution of hydrochloric acid that is approximately 0.1 M and wanted to determine its precise concentration. A 25.00 mL portion of the HCl solution is transferred to a flask, and after a few drops of indicator are added, the HCl

29. ## chemistry

A 12.6 mL sample of vinegar, containing acetic acid, was titrated using 0.542 M NaOH solution. The titration required 24.1 mL of the base. what is the molar concentration of acid in the vinegar?'

30. ## chemistry

148 mL of 0.325 M MgCl2 is mixed with 68.7 mL of 0.388 M NaOH and allowed to react completely. how many grams of Mg(OH)2 will form?

31. ## c

mixture is prepared by adding 27.0 mL of 0.169 M Na3PO4 to 35.1 mL of 0.234 M Ca(NO3)2. (a) What mass of Ca3(PO4)2 will be formed? (b)What will be the concentrations of each of the ions in the mixture after reaction? Put your answers with 3 significant

32. ## chemistry

'24.6 mL of 0.488 M NaCl is added to 24.6 mL of 0.312 M AgNO3. How many moles of AgCl would precipitate? What would be the concentrations of each of the ions in the reaction mixture after the reaction? Ion Concentration (M) Ag+ M NO3- M Na+ M Cl- M'

33. ## chemistry

23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

34. ## chemistry

23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

35. ## chemistry

Calculate the number of moles of each of the ions in the following solution: 30.8 mL of 0.507 M AlCl3

36. ## chemistry

How many milliliters of water must be added to 153.2 mL of 2.73 M KOH to give a 1.68 M solution?

37. ## north seattle college

2CH3OH + 3O2→ 2CO2 + 4H2O When 9.63 g of CH3OH was mixed with 15.7 g of O2 and ignited, 9.46 g of CO2 was obtained. What was the percentage yield of CO2?

38. ## Biology

I need help with the life cycle of an ostrich! And what could go wrong with the development. I don't understand if it's bacterial or viral infections that may occur...

39. ## math

what is the integral of sin^5(6x)dx

40. ## Geometry

at 10 feet away from the base of a tree, angle the top of a tree males with the ground is 61 degrees. of the tree grows at an angle of 78 degress with the respect to the ground, how tall is the tree to the nearest foot?

41. ## Physics

I'm having trouble setting up/solving this physics problem? Can someone please help me? Thank you. A 4700 kg lunar lander is in orbit 45 km above the surface of the moon. It needs to move out to a 340-km-high orbit in order to link up with the mother ship

42. ## Math

Historically, an acre was the amount of land that an ox could plow in one day, which was deemed to be 4,840 square yards. Supposing that an ox could plow 4,840 square yards in a day, how manyyears would it take an ox to plow a square mile?

43. ## Math

The Brock family uses a 12-cup coffee maker, which leaks. For every 6 cup of coffee brewed, 1/12 cup leaks out. Mrs. Brock makes a full pot. If 4 coffee drinkers receive the same amount, how many cups (use a mixed number) will each individual receive?

44. ## Math

Jan is making a 3-tier wedding cake for 300 guests. She will make the cake for \$3 per serving with the following specifications: -Each serving is 4 inch.3 -Each tier must be smaller than the tier below it. -Each square tier is 4 in. tall with a side length

45. ## Trigonometry

Consider the triangle ABC. Suppose that C=69 degrees, a=45 and b= 9 Carry your intermediate computations to at least four decimal places, and round your answers to the nearest tenth. List all solutions A= B= c=

46. ## Mathematics

Suppose that 4 people sit in 4 chairs in a circle. How many different new seating arrangements are possible if each person can move 1 chair to the left or right or remain as is and if 1 person must be in each chair?

47. ## Science/Math

John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook that included the

48. ## Math/Science

Wendell invests \$10,000 in a stock portfolio made up of Petroleum Special at \$30 per share, Newshoe at \$12 per share, and Beans and Sprouts at \$2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent in N (Newshoe), and 10

49. ## Science/Math

Math Problem page 18 Wendell invests \$10,000 in a stock portfolio made up of Petroleum Special at \$30 per share, Newshoe at \$12 per share, and Beans and Sprouts at \$2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent

50. ## Science/Math

Word Problem page 19 John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook

51. ## Basic Biomechanics

A sailboat heads north at 3 m/s for 1 hour and then tacks back to the southwest (at 45 degree to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?

52. ## Basic Biomechanics

John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?

53. ## Basic Biomechanics

Wendell invests \$10,000 in a stock portfolio made up of Petroleum Special at \$30 per share, New shoes at \$12 per share, and Capital beans and Sprouts at \$2.50 per share. He places 60 percent of the money in P.S., 30 percent in N, and 10 percent in B & S.

54. ## Biomechanics

A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?

55. ## Biomechanics

John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?

56. ## Basic Biomechanics

Wendell invests \$10,000 in a stock por5tfolio made up of Petroleum Special at \$30 per share, Newshoe at \$12 per share, and Beans & Sprouts at \$2.50 per share. He places 60% of the money in P.S., 30% in N, and 10% in B & S. With market values changing (P.S.

57. ## math

The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet? A.5 and 3y B.5 and 3 + y C.5 and 5 + y D.3 and 5 + 3y

58. ## luella high

The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet?

59. ## chemistry

How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL

60. ## writing skills

i need to write a essay on writing skills and writing assignment

61. ## Physics HELP

an object 3.00 cm high is placed 20.0cm from a convex mirror with a focal length of magnitude 8.00 cm. Find the position of the image. (Im using 1over20.00 + 1overQ = 1over-8.00) and the answer is q= -5.71cm. can someone tell how to do the math.. I suck at

62. ## statistics

The Deborah Heart Institute performs many open-heart surgery procedures. Recently research physicians at the Institute developed a new heart bypass procedure that they believe reduces the average length of recovery. The hospital board will not adopt the

63. ## Statistics

Waste Today Services operates a garbage hauling company in a South Jersey city. Each year, the company must apply for a new contract with the city. The contract is in part based on the pounds of garbage hauled. Part of the analysis that goes into the

◦What do you feel are the biggest weaknesses of the health care plan, and why? ◦Be sure to provide 2–3 weaknesses for each group (i.e. providers and patients), and explain your rationale for choosing each by supporting your thoughts with properly

65. ## math

one side of a square is decreased by 20% while its adjecent side is increased by 10%% forming a new rectangle. the area of the new rectangle formed is what percentage of the area of the original square?

66. ## relativity

A particle called neutral pi meson (or pion) decays into two photons (and nothing else).If the pion (whose rest mass is 135Mev) is initially at rest, What are the energies of the photons? How are they moving with respect to each other ?

67. ## math

the lengths of corresponding sides of similar rectangles have a ratio of 7:4 the perimeter of the smaller rectangle is 80 ft. what is the peremiter of the larger rectangle?

68. ## science

You are designing a scale model of the solar system mercury it is 4,878 km in diameter.using the following scale factor, how large does your model of mercury need to be? A. 160cm B. 16cm C.146cm D.30cm

69. ## Math

make a conjecture (obsevations based on patterns) for each sequence below. a)7,10,13,16 b)4,44,444,4444,44444 c)2,10,50,250 d)1,2,6,42,1806,3263442

70. ## English

Devil in the White City Chicago World's Fair benefits and downfalls... I need to write an essay on The Devil in the White City. I read the book and i have a pretty firm grasp on it, but im still having trouble finding events and ideas that occur that

71. ## algebra

When the quotient of a certain number and 6 is decreased by 14, the result is 4 find the number.

72. ## Algebra II

Y=-16X^2+100X+6 where x is the time in seconds and Y is the height in feet. find the zeros of the function? What do the zeros represent and are they realistic? and about how high does the rocket fly before hitting the ground?

73. ## com 140 Contemporary Business Communication

Characteristics of Interpersonal Communication Im having a little problem with this assignment not really sure what to do. There are 2 section on ths assignment 1 is Instructor message and 2 is Class mate message. In each section ther are 4 categories and

74. ## arithmetic math

For each of the following expressions, show each step a student would folow to mentally perform the calculations in the whole numbers. For each step, identify the law, definition , axiom ec that was used to roduce that step. 345+641+255+359

75. ## basic math

say i have something like (2/3)-(1/3) ---------------- 3 do i multiply the top this way (1/3)(3/1) by flipping the denominator or multiply it like this (1/3)(1/3)

76. ## trig

Work out the following identities a)sin pheta / cos pheta b)tan pheta cos pheta

77. ## trig

If a = 5 cm and b = 3cm, use the Pythagorean Theorem to find c

78. ## Accounting question..

Having trouble figuring out how to do this problem for my accounting homework.. any help would be greatly appreciated..the information given goes as follows.. On 1/1/08 you issue \$400,000 of 7%, 10 year bonds that pay intrest semiannually. The Market

79. ## maths

solve for x 8=6^x using logs

solve for x

81. ## algebra

can you show how to solve for x x+1/x + 6/2x-3 =0

82. ## maths

solve the following equation for x (x+1/x) + (6/2x-3)=0

83. ## maths

rearrange the following equation to find x in terms of y and t y(y-x)=3t(3t+x)

84. ## algebra

solve the following simultaneous equation algebraically,for a and b 8a+5b=23 12a+3b=12

85. ## chemistry

if you added sulfuric acid to calcium nitrate what products in addition to calcium sulphate would you get if any ? if you start with calcium nitrate mixed into H2SO4 (aq), wouldn't you get a solution of nitric acid? H2SO4 + Ca(NO3)2 >>> 2 HNO3(aq) +

86. ## chemistry

Given a solution in moles per litre how would you convert to parts per million)ppm.) could you help,no other information given apart from solution contains a known concentation of aluminium mols/L. Convert mols to grams. That will be grams per 1000 mL.

87. ## chemistry

calcium nitrate + sulfuric acid =caso4+? write a balanced chemical equation for this reaction including states. Ca(NO3)2 + H2SO4 ==> CaSO4 + 2HNO3 You don't have enough information to provide states. CaSO4 will be a solid so you write CaSO4(s). H2SO4 will

88. ## chemistry

write a balanced chemical equation for the following reaction including states not complete; no question.

89. ## Math

Show me how to solve problems like this. 1.) 7 + (-9) + (-5) + 6 2.) [(-3)(-4)(-5)]/ (-2)(-3)] Try reading the following sites' pages very carefully. Then make an attempt at doing the problem, and we'll see if you got it right:

90. ## math proportions

17/32 = x/100 1700 = 32x x= 53 1/8 Am I right? yep

91. ## Proportional Lengths--Desperate for help!!!

The lengths in the figure are proportional. In the first figure- 3 on top, and 2 on the bottom In the second figure- 4 1/2 on top, and x on the bottom These are the choices that are written on my assignment. One is the correct answer. A. 4 1/2 B. 3 C. 2

1. ## language arts

posted on February 26, 2020
2. ## math

sx

posted on January 14, 2020
3. ## freedom similes and metaphors?

Walter

posted on February 7, 2019
4. ## Chemistry

Acid +metal

posted on September 25, 2016
5. ## physics

80kg/m³

posted on June 18, 2016
6. ## Economics

Welfare payment is an amount of money that is paid by the government to some who is poor,ill,or jobless people

posted on April 24, 2016
7. ## Pre- Algebra

You are right

posted on March 11, 2016
8. ## MATH QUIZ PLS HELP!!!

Thank you Drew

posted on March 10, 2016
9. ## Help me with this math ms sue.

Thank you mystery person

posted on March 9, 2016