Jo

Most popular questions and responses by Jo
1. 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

2. 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?

3. 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

4. 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

5. 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?

6. 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

7. 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

8. 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

9. Math

If Mrs. Jacobsen wants to buy the item with the unit price , what item should she order and how many of that item should she order?

10. 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

11. Chemistry

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

12. 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

13. 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

14. chemistry

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

15. Chemistry

Given a diprotic acid, H2A, with two ionization constants of Ka1 = 3.9× 10–2 and Ka2 = 5.9× 10–8. Calculate the pH and molar concentrations of each protonated form for a: (a)0.135 M solution of H2A pH= [H2A]= [HA]= [A2-]= (b)0.135 M solution of NaHA

16. 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 :)

17. chemistry

A sample of chlorine gas is collected by water displacement at 23C. If the atmospheric pressure is 751 torr, what is the partial pressure due to the chlorine?

18. 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.

19. Statistics

A COMMITTEE OF 5 PEOPLE IS TO BE FORMED FROM 15 PARENTS AND 10 teachers. Find the probability that the committee will consist of at least one parent.

20. 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

21. 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?

22. 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

23. chemistry

Q: I just did an online chemisty lab for Oxidation States of Manganese and I'm stuck. I have three test tubes that have been prepared as follows: Tube 1- Starting PH 13.82 2 mL of KMnO4 1 mL of NaOH Tube 2- Starting PH 7 2 mL of KMnO4 Tube 3- Starting PH 0

24. 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

25. math

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

26. 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

27. Chemistry

Find the molecular formula of a compound that is 48.38% carbon, 8.12% hydrogen, and 53.5% oxygen by mass and has a molecular weight of 328 g/mol.

28. 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

29. 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

30. geometry

Three security cameras were mounted at the corners of a triangular parking lot. Camera 1 was 151 ft from camera 2, which was 122 ft from camera 3. Cameras 1 and 3 were 139 ft apart. Which camera had to cover the greatest angle?

31. Physics

A 25 kg box is dragged across a floor by a rope that makes an angle of 60 degrees with the horizontal. The tension in the rope is 100 N while the box is dragged 15 m. A) how much work is done by tension? B) how much work is done by gravity?

32. 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?

33. 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

34. Physics

The pulley system shown in the figure is used to lift a 52-{\rm kg} crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. The crate is rising with an acceleration of 2.5 m/s^2.

35. 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?

36. CHEMISTRY

Cant figure this out, I feel like the answer I keep getting is way too low. A voltaic cell is constructed that is based on the following reaction: Sn2+ (aq) +Pb(s) = Sn(s) + Pb2+ (a) If the concentration of Sn2+ in the cathode compartment is 1.00M and the

Calculate the molar solubility of silver chloride (AgCl) in: a-deionized water and b-.20M NaCl solution Given Ksp=1.6*10^-10

38. englsih

in the poem the sloth by theodore roethke is there any personification, alliteration, imagery or onomatopoeia

39. algebra

lura has 4 yards of material.she is making clothes for her doll. each dress requires 1/6 yards of material. how many dresses will she be able to make?

40. Chemistry

Balance this equation: Cu + H+(aq) + NO3-(aq) -- Cu2+(aq) + NO2 + H2O

41. algebra

An object is thrown straight up into the air at an initial vertical velocity of 32 feet per second from an initial height of 128 feet and is represented by the vertical motion model, h(t) = -16t^2 + 32t + 128. How much time does it take for the object to

42. 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

43. algebra

why is 0.57 considered a rational number?

44. 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

45. 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?

46. social studies

Historians have used the terms "robber barons" and "captains of industry" to describe the powerful industrialists of the late 1800's. compare the two points of view reflected by these terms.

47. maths

Find an equation of the line that is perpendicular to the line whose equation is 2x – 5y = 3 and passes through (-2, 7). Last time i posted this, the answer was wrong

48. Algebra 2

Sidewalk of uniform width has area of 180 ft squared and is surrounded ny a flower bed that 11 ft wide and 13 ft long. Find the width of the sidewalk?

49. Math

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

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

51. 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.

52. Mathematics

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

53. Physics

An 8.74-kg block slides with an initial speed of 1.52 m/s down a ramp inclined at an angle of 27.0° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.64. Use energy conservation to find the distance the block

54. Physics

You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (Fig. 1). You find that the slope of the hill is Ɵ = 120 , that the cars were

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

56. chemistry

Isotonic saline is a 0.9%(g/100ml) solution of salty water. You are asked to make up 2 Litres of isotonic saline. How much salt should you weigh out? Is this right? 0.9g/100ml * 2000ml = 18g of salt should be weighed out.

57. physics

A hunter wishes to cross a river that is 1.0 km wide and that flows with a speed of 4.9 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?

58. 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?

59. physics

rewriting this, since it was typed wrong. In reaching her destination, a backpacker walks with an average velocity of 1.34 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.68 m/s, due west, turns

60. math

A piece of cardboard measure 12ft by 12ft. Corners are to be cut from it as shown by the broken lines, and the sides folded up to make a box with an open top. What size corners should be cut from the cardboard to make a boxx with the greatest possible

61. 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

62. 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

63. Physics

An autographed baseball rolls off of a 0.85 m high desk and strikes the floor 0.68 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s

64. Chemistry

Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 124 kJ is given off per mole of C2H4 reacting,

65. 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

66. 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?

67. chemistry

Isotonic saline is often given to patients intravenously to replenish lost fluids. Isotonic saline is a 0.9g/100ml solution of salty water. You are asked to make up 2:1 of isotonic saline. How much salt should you weigh out?

68. 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

69. social studies

How are interest rates and wages similar? A. Both rise due to inflation. B. both are types of prices. C. Both relate to the cost of borrowing. D. Both are payment for work done. i feel like it is D or b? please help

70. sociology

There is a disparity between theory and direct observation. Because theories are based on observations, how are these theories first developed in the absence of direct observations?

71. 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

72. math

there Are four children in a family, the sum of the squares of the ages of the three youngest children equals the square of the age of the oldest child. How old are all the children.

73. marketing

what special advantages and potential problems did 3m have in introducing a new highlighter with flags product for college students in 2004

74. physics

Here were two tricky questions. Please provide steps. Answers are not necessary (since these are practice questions for an exam). 1.) The centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a

75. chemistry

Isotonic saline and is often given to patients intravenously to replenish lost fluids. Isotonic saline is a 0.9% 9G/100ml) solution of salty water. You are asked to make up 21 of isotonic saline. How much salt should you weigh out?

76. physics

a television antenna is on the roof of the building. from a pt. on the ground 36.0 feet from the building , the angle of elevation of the top and the bottom of the antenna are 51 degree celsiusand 42 degree celsuis respectively. how tall is antenna?

77. Chemistry

A 15mL sodium hydroxide solution of unknown concentration is titrated with 34.5 mL of 1.2M HCl solution. What was the concentration of the sodium hydroxide solution?

78. 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

79. math

Write an explanation of the steps you use to convert a measurement in one unit to a measurement in another. 1) How many picometers are there in a kilometre?

80. 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

81. 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

82. 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,

83. ALGEBRA

Use the distributive property to remove the parentheses in the following expression. Then simplify your result if possible. 10(P+5)

84. social studies

How are interest rates and wages similar? A. Both rise due to inflation. B. both are types of prices. C. Both relate to the cost of borrowing. D. Both are payment for work done. i feel like it is D or b?

85. Chemistry

Use Ksp to find the concentration of an ion in a saturated solution. Consider a 2.50E-3 M solution of Al2(SO4)3. (a) What [OH^-] is required to initiate precipitation of Al^3+ from the solution? (b) What [OH^-] is required to lower the [Al^3+] to 2.00E-7 M

86. Literature

How do you think a Puritan writer such as Anne bradstreet might have responded to the ideas presented in a psalm of life

87. 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?

88. Math

Felicia makes 1/2 gallon of fruit punch. She pour an equal amount into 8 glasses. What fraction of the fruit punch in each glass

89. PreCalculus

A variable star is one whose brightness alternately increases and decreases. For the variable star Delta Cephei, the time between periods of maximum brightness varies by +/- 3.5 magnitude. (a)Find a function that models the brightness of Delta Cephei as a

90. PreCalc

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 2 5 7 6 7 ok this is what i mean. For exmaple take this problem that I asked for help with before Naturalists find that the populations of some kinds of predatory animals

91. chemistry

Why is balanced chemical equation for H2O written 2H2+0>2H20 and not H20>H20?

92. Chemistry

You titrate a 10.0 mL sample of phosphoric acid with a 1.65 M solution of the base potassium hydroxide. It takes 7.55 mL to reach the endpoint of the titration. What is the molar concentration of the original solution of phosphoric acid? 3KOH + H3PO4 -->

93. maths

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

94. 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?

95. 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

96. Language

What part of speech are the following words this, of, books, sighed, heavily, doctor,ask, you, address, auscultated, are, bruits, read, last, and, my, will follow up, yesterday, tomorrow, gift, call it, present, always, on

97. child development

agood technique to prevent children from talking to you while you,re observing is to.

98. 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?

99. Math

Express log z+ 2 log y - 3log x as a single logarithm.