# Questions Asked onJune 12, 2012

1. ## chemistry

A 375 g sample of well water is found to contain 17.0 mg of lead. How much lead (in parts per million) is in the well water? Round to the nearest tenth. Don't forget the unit.

2. ## early childhood

When children do print alphabet letters among the easiest to print are a. A and X b . O and L c. C and U d. S and M is b correct

3. ## calculus

a university alumni group wishes to provide an annual scholarship in the amount of 1500 beginning next year. if the scholarship fund will earn an interest rate of 8%/year compounded continuously, find the amount of the endowment the alumni are required to

4. ## Chemistry

The decomposition of dinitrogen tetroxide produces nitrogen dioxide: N2O4 (g) ---> 2 NO2(g) ΔG°= 2.80 kJ/mol Find the minimum partial pressure of N2O4 at which the reaction is spontaneous if P(NO2)=2.00 bar and T=298 K.

5. ## Physics

A 2.5 m rod of mass M= 4. kg is attached to a pivot .8m from the left end so that it can rotate vertically. At the left end of the rod is a small object with mass m=1.5kg. A spring with a spring constant k=90N/m is attached to the right end of the rod. The

6. ## Algebra III

How many positive odd integers less than 10,000 can be represented using the digits 0, 3, 6 an 9?

7. ## Update Math Question

The area of triangle B is 64 times greater than the area of triangle A.The perimeter of triangle B is how many times greater than the perimeter of triangle A? how many times greater than the perimeter of triangle A? A. 8 times greater B.64 times greater

8. ## Math

Cassidy says that capacity is the same as the amount. do you agree? explain why or why not.

9. ## Chemistry

If a plant produces 8.06 mol of C6H12O6 how many moles of CO2 are needed

10. ## Physics

Three applied forces F1= 20N, F2= 40N and F3= 10N act on a crate with a mass of 2kg on an incline with θ = 30o, φ = 60o and μk = 0.2, find the acceleration

11. ## physics....

1) Yellow light that has a wavelength of 560 nm passes through two narrow slits that are 0.300 mm apart. An interference pattern is produced on a screen 160 cm distant. What is the location of the first-order maximum? 2) A communication satellite is

12. ## physics

What is the moment of inertia of a solid cylinder of radius R=0.9550m,thickness t= 0.015m, and total mass M= 3.565 kg?

13. ## Math

The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle.

14. ## Economics

Bank A has a leverage ratio of 10, while Bank B has a leverage ratio of 20. Similar losses on bank loans at the two banks cause the value of their assets to fall by 7 percent. Which bank shows a larger change in bank capital? Does either bank remain

15. ## chemistry

The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 188 kJ/mol to 86 kJ/mol which increases the rate of the reaction. How many times faster is the reaction with the catalyst at 307 K,

16. ## Physics

A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (2.1 m/s, 4.1 m/s). Particle 2 with mass 4.5 kg is located at (4.0 m, 1.0 m) and has a velocity of (4.6 m/s, 4.6 m/s). Determine the position

17. ## Physics

An airplane flying at 82km/hr at 30 degrees east of north encounters a 40km/hr wind due west. What is the speed of the plane relative to the ground?

18. ## Math

Find the value of K such that the following trinomials can be factored over the integers: 1. 36x^2+18x+K 2. 3x^2 - 16x+K

19. ## physics

A satellite with a mass of 260 kg approaches a large planet at a speed vi,1 = 13.1 km/s. The planet is moving at a speed vi,2 = 10.2 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a

20. ## physics

A rock is tossed straight up with a speed of 29m/s. When it returns, it falls into a hole 13m deep. Solve for rock's velocity as it hits the bottom of the hole. &How long is the rock in the air, from the instant it is released until it hits the bottom of

21. ## chemistry

Determine the entropy change for the following displacement reaction Cl2(g) + PbBr2(aq) --> PbCl2(aq) + Br2(l

22. ## chemistry

From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0

23. ## chemistry

From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0

24. ## Chemistry

For 105ml of a buffer that is .40 M in HOCL and .36M in NaOCL what is the pH after 13.4 ml of 1.5M NaOH is added? Ka for HOCL is 3.5x10^-8

25. ## chemistry

an electron jumps from energy level to energy level two by absorbing a photon of energy 8eV. What is the most likely energy of the photon that will be emitted by the electron when it moves back down to energy level one

26. ## Physics

A 13.0 kg box is released on a 33 degree incline and accelerates down the incline at o.20 m/s^2. A. Find the friction force impeding it's motion B. What is the coefficient of kinetic friction

27. ## statistics

Suppose a box has eight differently colored tennis balls in it. The colors are green, blue, red, purple, orange, black, and white. if I will randomly pick out three balls (without replacement), then what is the probability that the balls chosen will be

28. ## U.S. GOVERNMENT

1) The year that the Declaration of Independence was signed and pronounced to the rest of the world was... A) 1776 B) 1787 C) 1781 D) 1765 2)Which of the following was ratified with the assistance of adding a Bill of Rights to assure citizens that their

29. ## Statistics

How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in

30. ## College Chemistry

The initial concentration for the compounds involved in the reaction shown were determined to be [CH4(g)] = 0.6616 mol/L, [H2O(g)] = 0.8127 mol/L, [CO(g)] = 0.9566 mol/L, [H2(g)] = 0.7688 mol/L. Calculate the value of the equilibrium constant (Kc) at 1200

31. ## Physics

A potter's wheel rotates with an angular frequency of 1.54 rad/s. What is its period?

32. ## Physics

A 25 N book sits on a table. What is the magnitude of the normal force the table exerts on the book?

33. ## english

I am both a quick worker and careful.

34. ## physics

A 156 gram 8 ball rolls across a pool table at 2 m/s when it collides with a 7 ball of equal mass rolling in the opposite direction at 1.5 m/s. The 8 ball bounces backwards at 1 m/s. Find the momentum of the 7 ball.

35. ## chemistry

The rate constant of the reaction between CO2 and OH - in aqueous solution to give the HCO3- ion is 1.5 1010 1/(M·s) at 25°C. Determine the rate constant at blood temperature (37°C), given that the activation energy for the reaction is 38 kJ/mol. units

36. ## SCI/256 PEOPLE, SCIENCE, AND THE ENVIRONMENT

What are some social, economic, aesthetic, and ethical issues involved in a current environmental controversy? Explain.

37. ## ECONOMICS

Imagine that you manage a company that has invested \$5 million in developing a new product, but has not completed development. At the last meeting, your salespeople report that the arrival of new competing products has reduced expected sales of your new

38. ## Math

Find the domain and range of the relation, and state whether or not the relation is a function. {(3, 9), (3, 10), (3, 11), (3, 12)}

39. ## Art

Here is the last part of the same summary. Thank you, Writeacher. 1) One day the garage owner discovers his wife’s love-affair. To escape his violent reaction, she runs out of the house, and is run down by Gatsby’s yellow car, driven by Daisy. 2) To

40. ## Science

How do you test the properties of an unknown material?

41. ## English

for narrative essay i want to write about death, like before i used to think my world be perfect everyone be with me I have everything until my great grandmother died, and that be the first time someone in my family die that i be really close to, so that

42. ## statistics

Suppose that a researcher is interested in estimating the mean systolic blood pressure, , of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate . Assuming that the

43. ## physics

A 3.3-kg ball of clay with a speed of 14 m/s is thrown against a wall and sticks to the wall. What is the magnitude of the impulse exerted on the ball?

how did the Cuban revolution affect the Caribbean?

45. ## physics

A spring with a spring-constant 2.2 N/cm is compressed 28 cm and released. The 5 kg mass skids down the frictional incline of height 31 cm and inclined at a 18◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a

46. ## GED-Word Problems

Enrique put \$300 dollars into a savings account at 5% interest per year. The earned interest on the \$300 was added to the account at the end of the year. At the time Enrique made an additional deposit of \$200. How much does have in his account?

47. ## ALGEBRA

Suppose an insurance agent offers you a policy that will provide you with a yearly income of \$280,000 in 20 years. What is the comparable annual salary today, assuming an inflation rate of 5%?. (Round your answer to the nearest cent.)

48. ## Earth Science

Which of the following processes helps to shape the landforms of Earth? - Mass movement - Glaciers - Wind - All of the above

49. ## Math

for the curve y=2(3^x)+1, determine: the horizontal asymptote the y-intercept range end behaviour also, how would i sketch this?

50. ## College

If the line passing through point (a,1) and (8,7) is parallel to the line passing through the points (4,9) and (a+2,1) what is the value of a?

51. ## Chemistry

why would the concentration of ascorbic acid decrease as the temperature rises? Also is there any reason that the concentration would drop suddenly at 30 C then go back up and continue to decrease evenly. ( i repeated these 3set titrations 3 times and all

52. ## Chemistry

What massof iron is contained in 86.6 grams if FeSO4?

53. ## calculus

according to data released by the chamber of commerce of a certain city, the weekly wages of female factory workers are normally distributed with a mean of 575 and a standard deviation of 50. Find the probability that a female factory worker selected at

54. ## SS7R - ANSWER ASAP FINAL EXAM START@1:30 TODAY

what are the advantages of the north and south in the civil war and what's their strategies?

55. ## math

What is the apr if the amount financed \$3500; Interest Charged \$ 675; Number of Payments 24

56. ## Algebra II

Solve 4^(x+2)= 160 How would I round this answer to the nearest hundredth? My answer was 200, I don't believe I worked the problem out correctly.

57. ## Physics

A sphere weighs 200N resting on a wall. It is supported by a rope 20 degrees from the wall. What will be the tension force on the rope?

58. ## ALGEBRA

(a) Write the expression in terms of natural logarithms. (Express all logarithmic functions in terms of ln(x) in your answer.) log_(8.9) \(135\) = (b) Give a calculator approximation (correct to four decimal places). log_(8.9) \(135\) ~=

59. ## Geography

Growth by cell division that makes both ends of a plant longer but not wider is called A secondary growth. B annual ring growth. C vascular growth. D primary growth. is it D? thanks

60. ## Art

Writeacher, here is a summary I urgently need you to check. Thank you. 1) Gatsby is an enigmatic figure, a mysterious “self-made man”, who appears to have achieved the American dream of immense wealth. 2) He is the owner of a palatial mansion where he

61. ## CHemistry

what is a conjugate acid/base pair that would be suitable to prepare an ideal buffer with a pH more than 7? If possible can you include Ka and Kb values to explain why the pH would be more than 7

62. ## algebra

sue nees to find the length & width of a room. the room is 4 meters longer then it is wide. its perimeter is 24 meters. what is the width?

According to the doctrine of supply , the amount________ will increase as the _________decreases. I'm stuck on this question. I can't seem to find it in my text book

64. ## Chemistry

why would the concentration of ascorbic acid decrease as the temperature rises? Also is there any reason that the concentration would drop suddenly at 30 C then go back up and continue to decrease evenly. ( i repeated these 3set titrations 3 times and all

I have this assignment of constructing a business plan. I have chosen to make a flower shop which sells mainly different types of flowers, flower perfumes, flower scented soaps, air fresheners, etc. Would this business be in the primary, secondary,

66. ## statistics

. Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190

67. ## physical science

Which of these is the balanced equation for this reaction? A. B. C. D.

68. ## calculus

to find the possible relative extrema of the function f(x,y) subject to the constraint g(x,y)=8, the lagrangian function based on the lagrange multiplier λ is given by....

69. ## math equations

Solve x = log3 15

70. ## early childhood

When learning a finger play children usually learn the ----------first 1 actions 2 rhythm 3 words 4 rhymes is 1 right

71. ## physics

A spring with a spring-constant 2.2 N/cm is compressed 28 cm and released. The 5 kg mass skids down the frictional incline of height 31 cm and inclined at a 18◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a

72. ## Foreign languages

Writeacher, I urgently need you to check these sentences, though I believe they don't make sense. Although I'm not a mechanic, I don't think the use of scientific English is correct. 1) I would like to focus on a kind of technology which is used to

73. ## Medical Office Procedures

Which screen do you use to set the reason for the visit?

74. ## DeskToping

The _______ symbol is contained on the numeric keypad. A. ) B. % C. + D. \$ I got C. If you press the down-arrow key ( ): A. You will jump to the previous page B. You will jump to the next page C. The inseration point will move down one line D. The

75. ## to ms.sue

ok and thank you!

76. ## Physical Edu

The principle of progressive overload is described by an improvement in physical fitness which requires a gradual increase in physical activity and working the body beyond accustomed levels. is it True

77. ## Math

(2/3)^-2 + (-4)^-2

78. ## Earth Science

How old is the Gneiss in Greenland?

79. ## Math

Suppose the modified quota is 6.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower

80. ## math

a c-shaped tile (2 in the top row, 1 on the second, 2 on the bottom) can be placed on a number chart so that the sum of the numbers covered is 29. show how this can be done

• A compound is known to contain only C, H, and N. • On combustion of a sample of 12.5 mg, 22.3 mg of CO2 and 15.2 mg of H2O were produced. •Use this data to find the empirical formula for the compound. (Please show working out)

82. ## geometry

Show all work. Mary purchased a package of 15 different plants.but she only needed 10 plants for planting. In how many ways can she select the 10 plants from the package to be planted?

83. ## calculus

find the average value of the function f(x,y)=e^(-x^2) over the plane region R which is the triangle with vertices (0,0), (1,0) and (1,1)

84. ## calculus

find the derivative of the function f(x) = e^(3x) sec (7x)

85. ## chemistry

The first-order rate constant for photodissociation of A is 5.97 1/h. Calculate the time needed for the concentration of A to decrease to the following quantities. a. 5% of its original value h b. one-third of its initial concentration h

86. ## calculus

find the derivative of the function f(x) = x^2 cos (7x)

87. ## math

how do you graph f(x)=sin(x)-5

88. ## math 2

how do you solve the fowlling question

The question is Is the point (-3, -2) a solution of the intersection of the following set of quadratic equations: Y < -X^2 X^2 + Y^2 < 16 I guess I am somewhat confused by the way it's written. Would I be graphing this to find out? I'm so confused with

90. ## science

an electrical energy supplied to a toy car was 240 joules.If the car weighing 40N moved through a distance of 5m,calculate the efficiency

91. ## math

Determine the period, amplitude and phase shift for each given function: A)y = -4 cos 3x + 5 B)y = 2/3 sin (30x-90)-10 c)y = -0.38 tan (x/3+pi/3) d)y = pi cos(2x)+ pi

92. ## Statistics

A stoplight at the corner of Lincolnway and Duff Avenue is red 20% of the time. For someone who drives through this stoplight 10 times a week, what is the probability that they will stop at least three times?

93. ## ALGEBRA

If the principal P = \$900, the rate r = 4 1 2 %, and time t = 1 year, find the following. (a) What is the amount of interest? \$ (b) What is the future value?

94. ## Foreign languages

This is the second part of the paragraph. Though I don't think it makes sense at all, I would like you to have a look at it. I added a sentence on nanotechnology I'd like you to check, Writeacher. 1) So this element of the composite torque is not under

95. ## Math

The perimeter of triangle B is how many times greater than the perimeter of triangle A?

96. ## math

I don't understand this question. I am suppose to be simplifying this: u^4-1/u^3-1 I put (u^2+1) (u+1)(u-1) for the top but the bottom, I can't figure out why my book put (u^2+u+1)(u-1) when it's only u^3...where did the extra u come from?

97. ## Social Studies

Does anyone have any information about Sulawesi artifacts? I am having trouble finding facts about an ancient ceremonial mahogany grass bowl. Thanks.

98. ## to ms.sue-project

about my summer poject, my teacher said we had to go to the library to borrow book or go somewhere to buy it.

99. ## Elementary Statistics

Given a level of confidence of 95% and a population standard deviation of 13, answer the following: (A) What other information is necessary to find the sample size (n)? (B) Find the Maximum Error of Estimate (E) if n = 82.

100. ## Desktoping

The ______ symbol is used to represent mulitipication A. Asterisk B. At (@) C. Number (#) D. Tilde (~) I got C.

101. ## chemistry

A solution has H+ = 5.0 ´ 10–5 M. Assume temperature of the solution is 25 Centigrade.The pH of this solution is?

102. ## chemistry

What volume of LR(Lactated Ringer's) solution would be required to make 1.0L of a solution that was .050M in chloride ion?

103. ## physics

A 58-kg astronaut inside a 9-m-long space capsule of mass 550 kg is floating weightlessly on one end of the capsule. He kicks off the wall at a velocity of 3.6 m/s toward the other end of the capsule. How long does it take the astronaut to reach the far

104. ## English

What does HiRobo look like? 1. He is long and strong. 2. His arm is long and strong. 3. He has a long and strong arm. 4. He has a long strong arm. (Are the answers all correct? What about #3 and #4? Which one is correct? are both OK?)

105. ## english

i need help to finding a ballad pome

106. ## probability

two dice are tossed. find the probability that the sum is odd given that the sum is 5 or less

107. ## math

What is the range of f(x) = log(x – 3)?

108. ## history

which of the following was characteristic of the old stone age

109. ## physics

m1=4kg and m2=2kg and angle is 42 degrees.if the mass m2 is moving down with 0.5 m/s^2 acceleration, find the coefficient of the friction

110. ## math

If the value of x is 0, then what is the value of y in the function y = 3x - 5x2 + 9x3 - 8?

111. ## early chidhood

It is likely that a preschooler who learns to read early 1 will watch a lot of television 2 will enjoy playing outdoors as do other children 3 will watch less tv than other children 4 will enjoy playing outdoors as do other children and will watch less tv

112. ## math 2

how do you solve the fowllowing question 6+(2x-7) fraction 2 over 3 =31

113. ## geometry

L is a point on . CN = 85, CL = 32 – x and LN = 4x – 7. What is CL?

114. ## Math

Please round the number 43,678.426785 to the nearest ten thousand