# Jo

Popular questions and responses by Jo
1. ## science

two tall buildings are 200m apart .with what speed must a ball be thrown horizontally from the window 540 m above the ground in one building, so that it will enter a window 50m above the ground in the other?

2. ## Physics

Okay, I'm really confused in general. My question says: "A solid piece of clear transparent material has an index of refraction of 1.61. If you place it into a clear transparent solution and it seems to disappear, approximately what is the index of the

3. ## math

If a single fair die is rolled, find the probability of a 4 given that the number rolled is odd.

4. ## Calculus

A balloon is rising vertically above a level, straight road at a constant rate of 1 foot/second. Just when the balloon is 65 feet above the ground, a bicycle passes under it going 17 feet/sec. How fast is the distance between the bicycle and balloon

5. ## math

A ball is launched from a slingshot. Its height, h(x), can be represented by a quadratic function in terms of time, x, in seconds. After 1 second, the ball is 148 feet in the air, after 2 seconds the ball is 272 feet in the air. Find the height in feet of

6. ## math

TWO YEARS AGO, KIM INVESTED RMP AT HER ACCOUNT WHICH EARNS r% simple interest . after eighteen months , she noticed that the amount had become rm 10450 and today amount is rm 10600 . FIND THE VALUE OF p and r

7. ## Calculus help~!

Which is the standard form of the equation with p = 26, O= 3pi/4 ? SQRT2x – SQRT2y = 0 SQRT2x – SQRT2y + 52 = 0 SQRT2x + 52 = 0 SQRT2x + 52y = 0

8. ## physics

just a couple more questions 1.) The power needed to accelerate a projectile from rest to is launch speed v in a time t is 43.0 W. How much power is needed to accelerate the same projectile from rest to launch speed of 2v in a time of 1/2t? 2.)A ball is

9. ## Math

An Equilateral Triangle Of Side 20cm Is Inscribed In A Circle.Calculate The Distance Of A Side Of The Triangle From the Centre Of The Circle.

10. ## Chemistry

Why does the equation Co(H2O)6 + 4Cl CoCl4 + 6H2O shift left when cooled?

11. ## maths

Write an equation of the line that is parallel to the equation 5x – 2y = 6, that passes through (4, -2).

12. ## Math

the half life of a radioactive substance is one day. You have 100 grams. how much of the substance would be left after a week?

13. ## math

Classic Furniture purchases dining room sets with an invoice date of September 27, and terms of sale of 3/10, n/60. What is the net date? A) October 17 B) October 22 C) November 2 D) November 26

14. ## Chemistry

Hi everyone, I have been trying to figure out this titration equation all day and for some reason I am stumped. Here is the question in full: Potassium hydrogen phthalate, KHP, can be obtained in high purity and is used to determine the concentrations of

15. ## Calc

A paper cup is to be designed in the shape of a right circular cone. It must have a capacity of 12 fluid ounces (1 fluid ounce = 1.80469 cubic inches) of soft drink but it must use a minimum amount of material in its construction. What should the

16. ## macroeconomics

Assume that the government purchases decrease by 10 billion, with other factors held constant including the price level. Calculate the change in the level of real GDP demanded for each of the following values of the MPC. Then calculate the change if the

17. ## Math

.27 as fraction

A proportionate tax consumes a determinate apportionment of one’s monetary flow.

19. ## Algebra Problem Solving

Denise's cell phone plan is \$29.95 per month plus \$.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is \$99.95. For how many minutes was she billed? Answer is 700 but what is the algebraic equation?

20. ## Math

How many lines of symmetry does a regular decagon have? 0 5 10 20 I believe the answer is 10. Thanks for the help :)

21. ## geometry

What is the ratio of the area of sector AOB to the area of sector COD? 1/3,1/4,1/9,3/8

22. ## Chemistry

A 12 mL sample of 0.4 M silver nitrate solution is mixed with 8 mL of 0.8 M sodium chloride solution. Determine the identity of precipitate and the number of grams produced.

23. ## physics

1.)The apparent weight of a passenger in an elevator is greater than his true weight? Why is that? 2.) The radius of larger circle is twice that of a small circle. Two identical stones are attached to cords that are being whirled on a table top at the same

24. ## Managerial Economics

. Remox Corporation is a British firm that sells high-fashion sportswear in the United States. Congress is currently considering the imposition of a protective tariff on imported textiles. Remox is considering the possibility of moving 50 percent of its

25. ## math

significant numbers 2.8723 * 1.6 = 4.59568. Is it 4.6 because it is the smallest number you are multiplying it by in the sum? e.g. 2.8723 has 5 signifigant figures but 1.6 has 2 so the answer has no more than 2.Smallest number of significant figures. With

26. ## Math

7. Find the mean, median, and mode of the data set. Explain which measure of central tendency best describes the data. pages of homework: 2 2 2 5 3 9 7 3 5 2 8. You are training for a marathon. On the first three days of training, you run for 2, 4, and 5

27. ## Mathematics

Solve the quadratic equation 3x²=27 Solve the quadratic equation 2x² - 4x + 1 = 0

28. ## algebra

How much of a solution that is 45% sulfuric acid needs to be mixed with a solution that is 90% sulfuric acid to produce 120 liters of a solution that is 60% sulfuric acid?

29. ## math

if the terminal side of an angle , theta, passes through the point (3,-5). find sin(theta)

30. ## Phyics

A 56 kg astronaut stands on a bathroom scale inside a rotating circular space station. The radius is 250 m and the bathroom scale reads 42 kg At what speed does the space station does the floor rotate

31. ## Psychology

An extremely loud noise awakens you; you emerge from sleep confused and do not remember the noise. You were most likely in which stage of sleep. a. Stage 1 b. Stage 2 c. REM d. Stage 4 e. Twilight Sleep

Balance the following redox reaction and identify the oxidizing and reducing agents A- Fe2+(aq) + Cr2072-(aq) -->Fe3+(aq) + Cr3+(aq) (acidic) B- N2H4(g) + ClO3-(aq) -->NO2(g) + Cl- (basic)

33. ## physics

A slide is 5 inches high. it is placed 5.5 inches from the convex lens of a porjection lantern. The image is cast upon a screen 55 inches away. the focal length of the lens is ______inches? b) the heigh of the image cast by the lens is ________inches?

34. ## Math

There are18 boys and 20 girls in a class. What is the ratio of girls to boys?

35. ## math

i need someone to show the formula for this problem and amswer i have 16 not sure sally's art project is in the shape of a circle. she wants to put a piece of glitter string around the adge of her project has a radius of 4 inches, how much string will she

36. ## Chemistry

Given a diprotic acid, H2A, with two ionization constants of Ka1=3.9E-2 and Ka2=5.9E-8. Calculate the pH and molar concentration of each protonated form for a 0.135 M solution of: (a) H2A (b) NaHA (c) Na2A

37. ## Physics

forces of 185N and 245N act east and south respectively on an 80 kg mass.If the force of friction is ZERO , find the accleration of the mass.

38. ## chemistry

The environmental protection agency (EPA) wanted to study the particular materials in the atmosphere in Bogus Basin at 7200 ft elevation. The sampled air rate was at 1.00 liter per minute and was allowed to run 24 hours per day for 30 days. At the end of

39. ## economics

Two people enter a bus. Two adjacent cramped seats are free. Each person must decide whether to sit or stand. Sitting alone is more comfortable than sitting next to the other person, whihc is more comfortable than standing. a.) Suppose that each person

40. ## economics

For anyone with experience working with game theories... 1.) Two animals are fighting over some prey. Each can be passive or aggressive. Each prefers to be aggressive if its opponent is passive, and passive if its opponent is aggressive; given its own

41. ## chemistry

1.)KMnO4+H2SO4+NaHSO3--> 2.)KMnO4+NaOH+NaHSO3--> 3.)KMnO4+NaHSO3----> Write the net ionic equations for the reactions

42. ## Finance

As a lender, state which financial ratios you would use and how you would use them to evaluate a company. Identify the limitations that a banker would have to take into account when evaluating the financial performance of a company.

43. ## Physics

The coefficient of friction = 0.256 Mass of and object = 356 kg What is force of friction? Is this correct?... Ff = umg = 0.256*356kg*9.81 = 894 N

Write afact family with the sum of 17. Explain how you picked the addends.

45. ## physics

four forces 8N 6n 2n and 4n act on a point O in the directionsnorth east south and west respectively find the magnitude of their result and the direction of their resultant force

46. ## Math Combinatories

In the 2011 Canadian general election, 166 conservatives, 103 ndps, 34 liberals, 4 bloc quebecois, and 1 green were elected. If an all-party committee is to be formed consisting of 9 conservatives, 5 ndps, 2 liberals, 1 bloc quebecois, and 1 green, how

47. ## algebra

How much of a solution that is 45% sulfuric acid needs to be mixed with a solution that is 90% sulfuric acid to produce 120 liters of a solution that is 60% sulfuric acid?

48. ## Chemistry

A chemist reacted 0.05 moles of sodium with water to form 50cm3 of sodium hydroxide solution. Na + H2O -- NaOH + H2 (unbalanced) What mass of sodium was reacted?

49. ## algebra

why is 0.57 considered a rational number?

50. ## Math

Do the following points represent a point on the graph of y=x 4? (0.-4) (5,-1)

51. ## Physical Chemistry

If a 30g piece of ice at -5C is immersed in 125mL of water at 25C in an insulated container... A. Determine the final temperature and final composition of the system B. Determine the entropy changes of the ice and the water and the overall entropy change

52. ## calculus

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. x+y=4,x=5−(y−1) 2 ;

53. ## geometry

Two rectangles are similar. If the height of the first rectangle is 3 inches, and the height if the second rectangle is 9 inches, how much larger is the second rectangle's area?

54. ## research

what is the research problem discussed in the article: UNDER SURVEILLANCE: AN EMPIRICAL TEST OF THE EFFECTIVENESS AND CONSEQUENCES OF ELECTRONIC MONITORING? I have read this and I am totally lost. Please help

x + my =d

56. ## Chemistry

What chemical feature in the protein dictates the local secondary structure? α-helix β-pleated sheet random coils amino acid sequence pH hydrogen bonding

57. ## Division

If you have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8that marbles in each sack?

58. ## chemisty

NaOH + HCl -> NaCl + H2O What is the molarity of a NaOH solution that required 31.6mL to neutralize 25.0mL of a 0.145 M HCl solution?

59. ## chemisty

12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the

60. ## chemistry

12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the

61. ## chemistry

Reaction: Na2CO3 + 2 HCl -> 2 NaCl + CO2 + H2o How many grams of NaCl can be produced from the reaction of 1.35g of Na2CO3 with 125mL of 0.265 M HCl?

62. ## chil development

keeping systematic record of observations of children provid useful information for

63. ## algebra

the product of two consecutive even integersis 34 less than 7 times their sum.find the two integers.

64. ## HISTORY

In 2001, President George W. Bush signed the Economic Growth and Tax Relief Reconciliation Act of 2001 (EGTRRA). This bill called for large tax cuts just as the Economic Recovery Act of 1981 had and largely benefited the wealthiest Americans. President

65. ## chem

how do you tell which reactant is limiting reactant with the following information: mass of cup 55.78g mass o/sodium bicarbonate 1.01g mass o/citric acid 1.52g toal mass 58.31g mass of cup,solute after reaction 59.95g mass o/carbon dioxide .42g

66. ## Chemistry

H3C6H5O7(aq) + 3 NaHCO3(aq) ¨ Na3C6H5O7(aq) + 3 H2O(l) + 3 CO2(g) How do you go about calculating theoretical yield of carbon dioxide from 1.00g of sodium bicarbonate andthe percentage yield

67. ## Physics

A sled which has a mass of 45kg is sitting on a horizontal surface. A force of 120 N is applied to a rope attached to the front of the sled such that the angle between the front of the sled and the horizontal is 35 degrees. As a result of the application

68. ## College Algebra

Verify that the function f and g, are inverses of each other by showing that f(g(x))=x and g(f(x))=x. Graph both the functions on the same graph. Please show all of your work. f(x)=-7/x-4 g(x)=4x-7/x

69. ## chemistry

When a sample of carbon dioxide gas is at 36 degrees and 105 kpa is heated the new pressure of the gas becomes 165kpa. Determine the new temperature. Assume volume and amount of gas remain constant.

70. ## Calculus

A particle is moving along the curve whose equation is (xy^3)/(1+y^2)= 8/5. Assume the x-coordinate is increasing at the rate of 6 units/second when the particle is at the point (1,2). At what rate is the y-coordinate of the point changing at that instant?

71. ## computer science

in mobile phone network how many times as strong would a signal be expected to be at 200 m from a base station, compare with at 600 m? is it 81 or 9 or 3 or 0.3 or 0.1 or 0.01

72. ## physics

Two identical cars are traveling at the same speed. One is heading due east and the other due north, as the drawing show. What is true regarding the kinetic energies and momenta of the cars?

73. ## physics

Two cars are traveling at the same constant speed v. Car A is moving along a straight section of the road, while B is rounding a circular turn. Which statement is true about the acceleration of the cars? a.) acceleration of both cars is zero b.) car A is

74. ## economics (game theory)

For anyone with experience working with game theories... 1.) Two animals are fighting over some prey. Each can be passive or aggressive. Each prefers to be aggressive if its opponent is passive, and passive if its opponent is aggressive; given its own

75. ## com/155

include a discussion of sentence variety and the rhythm of the author's writing about Individuals can be denied credit for a number of reasons.

76. ## PreCalc

Naturalists find that the populations of some kinds of predatory animals vary periodically. Assume that the population of foxes in a certain forest varies sinusoidally with time. Records started being kept when t = 0 years. A minimum number, 200 foxes,

77. ## Statistics

Safety researchers, interested in determining whether the occupancy of a vehicle might be related to the speed at which the vehicle is driven, have observed the following speed (mph) measurements for two random samples of vehicles. Alone With Pass 64 44 50

78. ## statistics

For the following data independent samples, could the null hypothesis that the population means are equal be rejected at the 0.05 level? Sample1 Sample2 Sample3 Sample4 15.2 10.2 14.9 11.5 12.2 12.1 13.0 13.1 15.0 8.5 10.8 11.5 14.6 8.1 10.7 6.3 9.7 10.9

79. ## chemistry

if 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produced?

80. ## science

if 10 mol of hydrogen reacted with oxygen what volume of liquid water could be produced

81. ## ACcounting Ethics

3. Did Enron’s directors understand how profits were being made in this segment? Why or why not?

82. ## Astronomy

Which statement aout declination is FALSE. a. Polaris is almost at +90 degrees b. Stars passing your zenith have a declination equal to your local latitude c. Its origin is the celestial equator d. It is measured eastward in units of time e. It is much

83. ## algebra

Use your calculator to evaluate the following expression if x = –2.57, y = 1.55, and z = –1.98. Round your answer to the nearest tenth. 3X+Y/Z+2Y

84. ## algebra

Use your calculator to evaluate the following expression if x = –2.57, y = 1.55, and z = –1.98. Round your answer to the nearest tenth.

85. ## FRENCH

Last part of the story.. can someone proofread? Thanks! Especially to SraJMcGin! Le Grinch restant a indiqué Markey le suivre et il l’a conduit à une pièce avec aucunes fenêtres et aucuns sols. La pièce était remplie à ras bord des fées et des

86. ## physics

A skateboarder is approaching a set of stairs at a speed of 8 m/s. The stairs drop a vertical distance of h=3 meters and take up a horizontal distance d=5 meters. As the skater reaches the edge she can give herself a vertical component of velocity by

87. ## Concepts in organizational behavior

What is the most important element in an organizational analysis and why? I have the elements; organizational change & organizational development; I just can't find why? Any help would be appreciated. The elements you list in the analysis are not what I

88. ## spanish

for spanish class my teacher asked me to find a translation of the poem Declaracion by Uva A. Clavijo...except i don't know were to find it so if anyone could help that would be great. you can go on spanish web sites Thank you for using the Jiskha Homework

89. ## Statistics

A particular pain relieving medicine has a decay rate of 12% per hour. A patient was given a dose of the medicine 5 hours ago and there is currently 80 milligrams of the medicine in the patients bloodstream. After the dose was given how long must the

90. ## chemistry

What is the volume of a sample of helium that has a mass of 3.35 × 10−3 g, and a density of 0.17847 g/L?

91. ## Math

A caterpillar moves 6 cm in one minute how far will the caterpillar move in 6 minutes

92. ## Math

Two-fifths of the instruments in the marching band are brass. One-eight of the brass instruments are tubas. What fraction of the band is tubas?

93. ## Math

Alice gen tom ben going to the movies. The total cost of their ticket is t and the large popcorn they share will be p. How do i write an algebraic expression for this

94. ## Math

Find the roots of (z-1)^4=16i

95. ## pre-calculus

Find cos(a+b). sin a = 3/5, a lies in Quadrant I, and cos b = 12/13, b lies in Quadrant I.

96. ## Statistics

1. Do these data provide sufficient evidence for a real relationship in the population? Test at the .05 level, two tails. Use Pearson Correlation X Y 8 0 6 1 4 4 3 6 4 6 5 1 2. To test the effectiveness of a new studying strategy, a psychologist randomly

97. ## Math

Solve the quadratic equation 2x² - 4x + 1 = 0 How many solutions are in the equation 3x² + 4x - 7 = 0

98. ## Algebra

How do I do these?

99. ## Maths

Solve the quadratic equation 2x² - 4x + 1 = 0 How many solutions are in the equation 3x² + 4x - 7 = 0