Questions Asked onMarch 9, 2013

1. Chemistry

Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. pKa1: 2.16 pKa2: 7.21 pKa3: 12.32 Hint: Convert

2. Chemistry

A 0.464 gram sample of a metal, M, reacts completely with sulfuric acid according to: M(s) +H2SO4(aq)=MSO4(aq)+H2(g) A volume of 211 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level.

3. Teacher Aide

Which of the following factors contributes to the importance of teacher aides in schools today? a A decrease in the population b The decline of women in the workforce c The financial crisis in the school d Reduced teacher salaries

4. math

At a hockey game, a vender sold a combined total of 192 sodas and hot dogs. The number of sodas sold was two times the number of hot dogs sold. Find the number of sodas and the number of hot dogs sold.

5. physics

You've taken your neighbor's young child to the carnival to ride the rides. She wants to ride The Rocket. Eight rocket-shaped cars hang by chains from the outside edge of a large steel disk. A vertical axle through the center of the ride turns the disk,

6. math

Power companies typically bill customers based on the number of kilowatt-hours used during a single billing period. A kilowatt is a measure of how much power (energy) a customer is using, while a kilowatt-hour is one kilowatt of power being used for one

7. Physics

A 71.1 kg man steps out a window and falls (from rest) 1.24 m to a sidewalk. What is his speed just before his feet strike the pavement? If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.500 cm give in the pads of his

8. chemistry

Sn (s) + 2Cl2(g) --> SnCl4(l).Sn(s) + Cl2(g) --> Sn Cl2(l) DH = -186.2 kJSnCl2(s) + Cl2(g) --> SnCl4(l) DH = -325.1 kJWhat is the change in enthalpy?

9. physics

A toy train rolls around a horizontal 1.0-{\rm m}-diameter track. The coefficient of rolling friction is 0.15. What is the magnitude of the train's angular acceleration after it is released?

10. Finance Math

Jane made a down payment of 1500 dollars toward the purchase of a car. To pay the balance of the purchase price, she has secured a loan from her bank at the nominal rate of 5.8 percent per year compounded monthly. Under the terms of her finance agreement,

11. math

Q: Corbin is playing a board game that requires rolling two number cubes to move a game piece. He needs to roll a sum of six on his next term and then a sum of ten to land on to the next two bonus spaces. what is the probability that Corbin will roll a sum

12. Hamilton

Julia studied math 3 1/3 hours during the 4 days before her last test. what was the average amount of time she studied each day

13. Life orientation

In 15 line critically discuss 5 way which the human problem impact on the community for teenage pregnancy

14. chemistry

Is CF4 polar or nonpolar?

15. Chemistry

NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.050 M in NH4Cl?

16. Physics

A pellet gun is fired straight downward from the edge of a cliff that is 15m above the ground. The pellet strikes the ground with a speed of 27 m/s. How long does it take for the pellet to reach the ground with an initial velocity of 5.9 m/s.

17. Math

Write two unit rates relating meters and kilometers.

18. algebra

Triangles ABC and DEF are similar. Find the area of triangle ABC. Round your answer to the nearest tenth. the answer should be __________m^2 triangle abc has a 12m. triangle def has 12m and 18m.

19. Physics

A 0.157kg ball is thrown straight up from 1.81m above the ground. Its initial vertical speed is 10.40m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time.

1.) Two people of the same mass climb the same flight of stairs. The first person climbs the stairs in 25 s; the second person does so in 35 s. a) Which person does more work?Explain b) Which person produces more power?Explain 2.) Lee pushes a 20 kg mass

21. Chemistry

In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species. (most to least) H2O HClO H3O OH- OCl-

22. Accounting - Struggling answering this.

Updraft Systems, Inc., makes paragliders for sale through specialty sporting goods stores. The company has a standard paraglider model, but also makes custom-designed paragliders. Management has designed an activity-based costing system with the following

52. math

which of the followng is a rational number a.2 square root 3 b. 2 pie c.3.14444 d.0.123456 how do you figure this out explanation

53. science

I don't understand how to do this problem because i don't see a precipitate. If you could show your work on the problem that would be great so i can follow along! Identify the spectator ion(s) in the reaction Zn(OH)2+ H2SO4→ZnSO4+ 2H2O in aqueous

54. OOP(netbeans)

Write a program that accepts a person’s weight and displays the number of calories the person needs in one day. A person needs 19 calories per pound of body weight, so the formula expressed in Java is Calories = bodyweight * 19;

55. ENGLISH/MATH/SCIENCE HELP!

Is there any websites for teens to read short stories (or long), then you answer ONLY multiple choice questions, grade you, and to have a profile or something to see all of your grades if your making progress each time (to see if your improving). I want to

56. Chem

how many grams of KMnO4 should be weighed out to give 0.100 mole?

57. Math

The outstanding balance on Bill's credit card account is 3690 dollars. The bank issuing the credit card is charging 21 percent of interest per year compounded monthly. If Bill decides to pay off his balance in equal monthly installments at the end of each

58. english

The most obvious difference between online learning and traditional is: A. ease of learning. B. lack of face-to-face interaction. C. anonymity. D. quality of learning. is it D

59. Geometry

ABCDE is a regular pentagon. FAD is an equilateral triangle, such that points F and E are on the same side of line AD. What is the measure (in degrees) of \angle FAB?

60. science

I don't understand how to do this problem because i don't see a precipitate. If you could show your work on the problem that would be great so i can follow along! Identify the spectator ion(s) in the reaction Zn(OH)2+ H2SO4→ZnSO4+ 2H2O in aqueous

61. English

Write a 350-word debate paper in which you discuss the benefits and drawbacks associated with group debates.

asked by Jamie Melching
62. calculus

Use a linear approximation of f(x)=log(x) at x=1 to approximate log(3/4). Express your answer as an exact fraction; remember that log denotes the natural log.

63. calculus

Use a linear approximation of f(x)=^3√x at x=8 to approximate ^3√7. Express your answer as an exact fraction.

64. Biomechanics

A hammer thrower is trying a new throw by adjusting the arm length to increase angular velocity technique1 angular velocity of15.4rad/ s with the hammer being 139.8 cm from the shoulder joint in technique2 they rotate with an angular velocity of 13.9 rad/s

65. lang. Arts

Which sentence contains a prepositional phrase? A.The grasshopper jumped high. B.The criminal held up the gas station. C.The store is closed. D.Mikie drove to the store. Is it B?

66. Biomechanics

A cyclist completes 3.0 revolutions in 1.59s what is the angular velocity?

67. Lang. Arts

Which sentence contains a prepositional phrase? A.The grasshopper jumped high. B.The criminal held up the gas station. C.The store is closed. D.Mikie drove to the store. I think it is A?

Find the largest real number x for which there exists a real number y such that x^2+y^2 = 2x+2y . I think it is a circle, but how am i supposed to figure this out??

69. Lang. Arts

In this article, many kids are quoted on their opinions about popularity. They talk about what in-crowds are like. One middle school student admits, “Lately, I have been feeling so unhip.” Which of the following is a direct quotation? A.“many middle

70. edu

Which of these scenarios best describes a nuclear family? A) Jeremiah is growing up within a cluster of adults and children who maintain their own living quarters but come together for work and meals. Child-rearing is a shared responsibility. B) The

71. calculus

Let f(x)=e^(x2). By the Mean Value Theorem, there exists a point c such that f′(c)=f(6)−f(4)6−4 with c between 4 and 6. Approximate c to within two decimal places; we're asking you to approximate c, because you can't "solve" for c.

72. math

which equation represents a line with slope -2 and passes through(-1,5)? how do you do this?

73. Physics

a boat crosses a 2 km wide river by starting out at the south shore and heading directly for the north shore if the river flows at 0.8 m/s and the boat can go at 1.4 m/s in still water, where on the opposite shore will the boat land?

74. chemistry

the molar mass of NaOH is 40g/mol, how many grams ofNaOH are required to yield 0.65 mol?

75. Biomechanics

During the support phase of walking the absolute angle of the thigh has the following angular velocities frame 38 0.6167s 1.033rad/s frame 39 0.6333s 1.511rad/s 40 frame 0.6500s 1.882rad/s calculate the angular acceleration at frame 40 from frame 38

76. Skills for the effective Teacher Aide

Has anyone taking this course, need help with this question. According to the SMCR model, problems in communication can arise when the speaker fails to do a maintain eye contact with the receiver b speak on the level of the receiver c have outside interest

77. Lang. Arts

What evidence from the article best supports the article’s main idea: that middle school students should concentrate on a few good relationships and not worry about being popular? A>“[You] need to see that liking [yourself] is more important than being

78. Lang. Arts

4. Identify the appositive phrase in the following sentence. Mrs. Talavera, an eighth grade teacher at Rosewood Middle School, led the community meeting about childhood obesity. A.Mrs. Talavera B.an eighth grade teacher at Rosewood Middle School C.led the

105. Teacher Aide

Which statementis true regarding the structure of the school system in the U.S. a its centralized under the Dept of Education b It's decentralized c It's controlled by the teacher's and their unions d It's managed by the state

106. English

You should mark the blank in the smile emoticon column if you like the activity. If you don't like an activity, you should check the box in the sad emoticon column. By doing that you should complete the table on the page. After you finish completing the

107. Critical Points

find values for a, b, and c so that the function f(x) = x^3 + ax^2 + bx+ c has a critical point at (1,5) and an inflection point at (2,3). I got a as -6, but I don't know what b and c are. For b and c I just have b + c= 10. I do not know how to proceed

108. College Algebra

Consider only the discriminant, b2 - 4ac, to determine whether one real-number solution, two different real-number solutions, or two different imaginary-number solutions. 2x2 = -2 -5 Thank you

109. chemistry

find the concentration of Pb^2+ in equilibrium with PbBr_2_ and 0.10M Br^-

110. chemistry

Find the concentration of Ag^+ in a saturated solution of AgBrO_3_ that also contains 0.02M LiNO_3_, .02M KClO_4_ and .01M NaF

111. Algebra

area of a triangle with a base of 1 4/5 yards, and a height of 5/7 yards.

112. Biomechanics

A golfer at the tee swings their driver and completes a downswing in 0.27s through a range of 196.1degree. What is the average angular velocity of the club head

113. Astronomy - Physics

Now, wait until the planet is at the winter solstice (12:00am). a) How many hours of daylight are there on the winter solstice with the inclination at 45 degrees? Use the same criteria for the length of day that you used for the previous question.

114. grammar

So I am writing my paper and I am confused I know you use fewer when you have something countable like items. and less when its not a countable things. For my example would I say that 5% concentration of coffee had less of an effect of fewer effects than a

115. civics

Hi, I'm really confused. I have to explain all of the major provisions of the bill of rights. But what does it mean by "provisions"? Does the question just mean to explain each of the 10 amendments in the bill of rights?

116. General English Part 11

Describe how the poem is structured, or arranged in lines and stanzas.

117. 5th grade math (word problems)

I got these problems wrong in class. but, think i have the right answer now. Can you check? 1. Jim's mother made pizzas for his birthday. SHe sliced the pizzas into 50 slices. She served Jeff and his 7 guests the same number of slices and she ate the rest.

118. geometry

How many square inches are in the lateral surface area and total surface area of an aluminum can with 2 1/2 in. diameter and 4 3/4 in. height? I've worked on this until I'm crossed-eyed and it's not coming out right!

119. algebra

solve A)p(x)= x(x+2)(x-4) b)p(x)=(x+2)^3(x-1)

120. Maths B

Andrew got 68 for both English and Maths. The mean for english was 52 and the mean for Maths was 55. The standard deviations were 10 and 8 respectively. Determine the subject in which andrew did better

121. Photography help

Im sorry i posted this here, but i really need help! I need a free app for ( ipad 2 ) that can pause while making the video,,.. So i can edit.. :) please and thank youu

122. chemistry

How many electrons in a cesium atom can have the quantum numbers of n = 3 and ml = -1

123. math

Einsteins famous formula E=mc^2 relates energy E,mass m and the speed of light c. solve the formula for c.

124. Teacher Aide

A common characteristics of regional educational agencies is that they a don't hire aides b provide many services that individual school districts couldn't afford c serve all of the school districts in a state d are located in Eastern states

125. Algebra

six times a number minus twice the same number.

126. algebra

Last semester, a certain professor gave 11 As out of 226 grades. If one of the professor's students from last semester were selected randomly, what is the probability that student received an A? (Assume that each student receives one grade.)

127. Science need help

all but one of the following statement about the melting and crystallization of magmas is correct.identify the one statement that is incorrect. 1)the presence of water decreases the melting temperature of magma. 2)the upper part of magma in a magma chamber

128. Account

Updraft Systems, Inc., makes paragliders for sale through specialty sporting goods stores. The company has a standard paraglider model, but also makes custom-designed paragliders. Management has designed an activity-based costing system with the following

129. science help?

a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?................ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?................ms^-1

130. Astronomy - Physics

Finally, we will look at a system that is in an orbit comparable to the Earth to see how the angle that the light strikes the surface and the length of day contribute to the total amount of energy that we receive from the Sun at the two solstices. Recall

131. Life orientation

5 practise of contravention of basic condition of employment act

asked by Maine refilwe
132. English

A key to the student’s ability to apply strategies so that school requirements, assignments, and exams are met in a timely fashion is: A. critical thinking. B. time management. C. self-motivation. D. communication. is it A

133. English

Is there anything wrong with this sentence? The color-coded table of contents will provide an easy access search for instructions.

asked by Bernie B
134. Math-geometry

If a dice has 3 on the top, right back 6, right front 2, bottom 4, left front 1, left back 5 and is rotated by +180 about the z axis and +90 about the x axis, how many dots does each face have after the rotation?

135. Math-geometry

If a dice has 3 on the top, right back 6, right front 2, bottom 4, left front 1, left back 5 and is rotated by +180 about the z axis and +90 about the x axis, how many dots does each face have after the rotation?

136. Absolute Extrema

Find the minimum and maximum values of the function f(x)= 2/3 sin pix on the interval [1,2] (domain). I got (1.5, -2/3) as the minimum and no maximum on the interval. Is it correct? Thank you.

137. algebra

p(X)= X(X+2)(X-4) P(X)=(X+2)^3(X-1)

138. science

how do i find the area for light?

139. Humanities

I need some suggestions of a 20th-century figure whose work or artistic contributions can be classified in both the Age of Modernism and the Age of Pluralism for a paper I am writing.

asked by Mr. Need Help
140. chemistry

find the concentrations of Ca^2+ and F^- in a saturated solution of CaF_2_

141. math

describe the transformation of y=8^x+2 from the graph of y=8^x then state the asymptote and domain and range.

142. Math

5/8+3\4-7\12 Simplify

asked by Ashrith.N Kashyap
143. Biomechanics

A diver is trying a new more and is attempting to increase his angular acceleration in order to increase the angular displacement and thus produce more rotations from a standing start on the board the diver accelerates at 950 degree/s/s.what is the angular

144. maths

Solve for m:E=mgh+1\2mu

145. math

the angle of a quadrilateral are in the ratio 4:5:3:8. find the measure of each angle