1. Physics

A boy on a 2.2kg skateboard initially at rest tosses a 7.9kg jug of water in the forward direction. If the jug has a speed of 3.2m/s relative to the ground and the boy and skateboard move in the opposite direction at .56m/s, find the boy's mass. Answer in

2. Physical Geography

Will someone please check my work? I cannot seem to post the map that is in the workbook. Assume that a parcel of air is forcd to rise up and over a 4000 meter high mountain.The initial temp of the parcel at sea level is 30*c, and the LCL of the parcel is

3. AP Chem

An electrochemical cell consists of a nickel metal electrode immersed in a solution with [Ni2+] = 1.0 M separated by a porous disk from an aluminum metal electrode. (a) What is the potential of this cell at 25°C if the aluminum electrode is placed in a

4. physics

A 500 {\rm g} ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle, the tension in the string is 14 {\rm N}.What is the speed of the ball at that point?

5. Chemistry

Express the rate of the reaction 2C2H6 + 7O2 -> 4CO2 + 6H2O in terms of: a. Delta [C2H6] b. Delta [CO2] Show work please

6. Chemistry 12

In s 0.30 mol/L HNO3(aq) solution. a) what is the concentration of nitric acid molecules. b)what is the hydroxide ion concentration?

7. Physics

A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 600 N. As the elevator later stops, the scale reading is 396 N. Assume the magnitude of the acceleration is the same during starting and stopping.

8. AP Chemistry

A 500ml saturated solution of MgCO3 (M=84) is reduced to 120 ml by evaporation. What mass of solid MgCO3 is formed? The answer is 0.20g, I just need a detailed explanation. Thanks!

9. chemistry

How many moles of Na2CO3 would be needed to react with 750 mL of 0.250 M H2SO4 solution?

10. chemistry

Balloon X is filled with the carbon monoxide. Balloon Y is filled to the same volume with carbon dioxide. The balloons are left for several days in a room at constant temperature. Which balloon would you expect to be smallest after this period of time?

11. physics

"A 1220-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Find a) the magnitude of the tension in the cable and b) the magnitude of the horizontal and

12. geometry

if ED=10 and DB=3x-8 whats the lenght of EB

13. Chemistry

A titration is performed by adding .600 M KOH to 40.0 mL of .800 M HCl. Calculate the pH before addition of any KOH. Calculate the pH after the addition of 5.0 mL of the base. Calculate the volume of base needed to reach the equivalence point. What is the

14. Algebra

Ernest receives $555 per year from his$7000 investment in municipal and corporate bonds. His municipal bonds pay 6% and his corporate bonds pay 9%. How much money is invested in each type of bond

15. physics

Two hundred liters of gas at zero degrees Celsius are kept under a pressure of 150 kPa. The temperature of the gas is raised to 273 degrees Celsius and the pressure is increased to 600 kPa. What is the new volume?

16. chemistry

how many grams of iron are needed to react with 31.0L of chlorine gas at STP to produce iron(III) chloride?

17. Science

CH4 + 20 2 --> CO2 + 2H2O How many liters of CO2 would be produced if 32 grams of CH4 are combined with oxygen??? How many grams of H2O would be produced when the 32 grams of CH4 are burned???

18. calculus

A missile is fired at an angle of 75 from the horizontal. At one point, its speed was 900 mph. Find its horizontal velocity in miles per minute

19. chemistry

can u mention me 5 acidic salts , 5 basic salts and 5 neutral salts ?

A man standing on a frictionless ice throws a boomerang which returns to him. Asuuming that the boomerang can only move in a a circular path, choose the correct statement: A)Since the momentum of the man-boomerang system is conserved, the man will ocme to

21. Chemistry

A small bottle of propane gas (C3H8) contains 400.0 grams of propane. When the propane is burned in oxygen, how many moles of each product are formed?

22. physics

The diagram represents a snapshot of a standing transverse wave on a flexible guitar string taken when the displacement is at a maximum. (Note: the vertical scale is very exaggerated, the actual sideways displacement of the string is negligibly TINY

23. Science

Suppose all of the apples have a mass of 0.10 kg and one of the apples in the bowl (C) is 1.0 meter off the ground. If the apple (C) falls from the table, what is the maximum kinetic energy it can gain?

24. algebra

Television sets. What does it mean to refer to a 20-in TV set or a 25-in TV set? Such units refer to the diagonal of the screen. A 10-in TV set also has a width of 8 inches. What is its height?

25. Chemistry

Using Volumetric Glassware to Measure, Dilute,and Titrate Acid Solution 1)For each of the following procedural errors, indicate whether the calculated molarity of the HCl solution would be higher or lower than the actual molarity. Briefly explain. a)The

26. physics

A 20.0 \mu F capacitor initially charged to 20.0 \mu C is discharged through a 1.90 k\Omega resistor. How long does it take to reduce the capacitor's charge to 5.00 \mu C?

27. physics

"By means of a rope, whose mass is negligible, two blocks (mass: 11kg and 44 kg) are suspended over a pulley. The pulley can be treated as a uniform solid cylindrical disk. The downward acceleration of the 44 kg block is observed to be exactly one half the

28. Algebra 2

Aki's Bicycle Designs has determined that when x hundred bicycles are built, the average cost per bicycle is given by c(x) =0.1x^2 -0.5x+ 9.295. Where C(x) is in hundreds of dollars, how many bicycles should the shop build to minimize the average cost per

29. physics

At the Indianapolis 500, you can measure the speed of cars just by listening to the difference in pitch of the engine noise between approaching and receding cars. Suppose the sound of a certain car drops by a factor of 2.30 as it goes by on the

30. chemistry - heat absorption (help)

When a vehicle is parked in the sunlight on a hot summer day, the temperature inside can approach 55°C. One company has patented a non-CFC propelled aerosol that can be sprayed inside a vehicle to reduce the temperature to 25°C within seconds. The spray

31. english

Make any necessary corrections to the following paragraph- look for sound alike words, verb tense shift, singular subject/pronoun agreement etc… Tom Greene, Director of Sales, was in the office yesterday. He shows the staff various new products for

32. Physics

At a recent rock concert, a dB meter registered 118 dB when placed 1.60 m in front of a loudspeaker on the stage. (a) What was the power output of the speaker, assuming a hemispherical radiation of the sound and neglecting absorption in the air? Answer in

33. english

Section I: Make all necessary corrections to the following sentences. If a sentence has no errors, mark it correct as written: I did it but need reassurance. first sentence is teachers the second one is mine. 1. I’ve always wanted to go to college, it is

34. physics

"A solid cylinder and a thin-walled hollow cylinder have the same mass and radius. They are rolling horizontally along the ground toward the bottom of an incline. They center of mass of each cylinder has the same translational speed. The cylinders roll up

35. algebra

Retail Sales of Sweatshirts: Sandy's Sweatshirt shop sells college sweatshirts. White sweatshirts sell for $18.95 each and red ones sell for 19.95 each. If receipts for the sale of 30 sweatshirts total$572.90, how many of each color did the shop sell? How

36. physics

"A small 0.5 kg object moves on a frictionless horizontal table in a circular path of radius 1 meter. The angular speed is 6.28 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the

37. Physics

Two masses are connected by a string as shown in the figure. Mass = 3.4 rests on a frictionless inclined plane, while = 5.5 is initially held at a height of = 0.90 above the floor.

38. physics 1001

The pressure in each of your car tires is 2.10 105 Pa. The mass of your car is 1690 kg. Assuming that each of your tires bears one-quarter of the total load, what is the contact area of each tire with the road?

39. Physics

I have been working on this problem all day and i just cant get the answer. Please help I would really appretiate it. The position of a 230 g object is given (in meters) by x = 4.9t^3 - 8.0t^2 - 44t, where t is in seconds. 1. Determine the net rate of work

40. chemistry - combustion

Write the chemical equation for the complete combustion of each fuel. Then find the enthalpy of combustion, ΔHcomb, of each fuel. Express your answers in kJ/mol and kJ/g. Assume that water vapour, rather than liquid water, is formed in both reactions. CH4

41. accounting

prepare entries to record the following summarized operations related to production for a company using a job order cost system: a. materials purchased on account-$167000 b. prepaid expenses incurred on account-$12200 c. materials pequisitioned: for

42. Org Chem

Which of the following compounds could be meso compounds? a. 2-bromo-4-chloropentane b. 2,5-dimethylheptane c. 2,4-dimethylpentane d. 4,6-dichlorononane

43. physics urgent

an airplane is flying horizontally over ocean at the speed of 200 meters/seconds and at the altiude of 2000 meters.the pilot drops a flare. A. how many second after release does the flare hit the water? b.At what distance from point p,directly under point

44. French - SraJMcGin/Frenchy

Aimez-vous l'art? Pourquoi? Pourquoi pas? English: [Yes, I love art because it is an expression of the soul. It lets you escape reality and look through the eyes of others. Looking at art makes me feel different emotions, it gives me a different way of

45. physics

A car traveling at 24.3 m/s honks its horn as it directly approaches the side of a large building. The horn produces a long sustained note of frequency f0 = 213 Hz. The sound is reflected off the building back to the car's driver. The sound wave from the

46. Calculus (urgent!!)

Consider the function f(x)=12x^5+60x^4−100x^3+4. For this function there are four important intervals: (−INF,A], [A,B] ,[B,C] , and [C,INF) where A, B, and C are the critical numbers. Find A, B, and C. At each critical number A, B, and C does f(x) have

47. math--Tangents

Find the measurement of angle X given that tan X=0.5736 . Round to the nearest degree.

48. Programming

Write a program to do the following: In main, declare a Player Name Array and a Score Array. Declare the size of the arrays to be 100. In the InputData( ) method, input the player name and score into the arrays for an unknown number of players up to 100.

49. physical science

How much work is required to lift a 10kg weight 5m off the floor if the time is 10 sec?

An artillery shells is moving on a parabolic trayectory, when it explodes in midair. The shell chatters into a very large number of fragments. Which of the following statements is true? (Select all that apply.) A) A center of mass of the system of

51. French - SraJMcGin/Frenchy

Aimes-vous peinture " Girl before a Mirror - Picasso? Pourquoi ou pourquoi pas? English: [Yes I like the painting "Girl before a Mirror by Picasso because it is really colorful, and the reflection of the girl is something totally different, its strange but

52. math-triangles

finding the hypotenuse for triangles with only one measure of 7.8 m and two angles with degrees of 90 and 40. The picture is a right triangle with the right angle on the bottom left(labeled S). The hypotenuse goes from the top left(making angle Q with the

53. french 2

I have a quiz monday on the verb VINIR, and on the quiz we have to make a chart on the passe compose, the imparfait, and the venir forms...any suggestions on how to study? this quiz is all on memorization...and i don't really have a good memory when it

54. English

What responsibility do you think the international community has when natural disaster strikes a community as it did in Haiti? Do you feel the international community failed the Haitian people? If so, what should they have done differently?

Two trees stand side-by-side. The shorter tree is feet tall. Its shadow is 9 feet long. The taller tree is feet tall. How long is its shadow?

56. English

After Watching Titanic I like watching movies. I saw the movie Titanic with some of my friends. It was great fun. I especially liked the scenery. The actions of the actors in the movie was realistic. The role of the main actors was romantic. The big

57. physics

The density of a sample of air is 1.235 kg/m3, and the bulk modulus is 1.42 · 105 N/m2. a) Find the speed of sound in the air sample. b) Find the temperature of the air sample. Give answer in °C. Do not enter unit. Yanlýþ. Denemeler

58. math

i really have trouble with math and the algerba really gets me mixed up can u give me some tips for math so i can undrestand plese

24x^2-22x+3

60. sample t-test

A major television network is trying to determine whether to increase or decrease the number of news-based television shows. They conducted a national survey and found that their population watched 8 news shows each week. Now they need your help to

61. MathMate

Are you just a math tutor? Cause you could provide great help in English to jiskha students.

62. maths

ratio in simplest form for 1.1/3:2.1/4

63. English

It took me a while to meet my communication goals, because Mrs. step was not their for a while. Does this sentence need the comma before because?

64. munir

1. Consider a projectile, say a frictionless teddy bear, which is thrown at an angle of theta with an initial velocity of v0.  a) For a fi xed angle, and the maximum height of the teddy bear.  b) Calculate the distance that the teddy bear travels before

65. math/physics

5. Consider a particle moving counter-clockwise around the ellipse x^9/9 +y^2/4 = 1. Find a relationship between dy/dt and dx/dt What are the rates of change of y and x at the times when the other variable isn't . changing at all?

66. Algebra 2

During the first part of a trip a canoeist travels 93 miles at a certain speed. The conoiest travels 5 miles on the second trip at 5mph slower. The total time for the trip is 2 hrs. What was the speed on each part of the trip? I entered 1.999 as answer

67. spanish

Say that the person has his/her/their own book or books. Ella tiene ______ libros.

68. English

1. What is the person doing in Picture 1? He is cutting out a flower on the light green paper with a pair of scissors. 2. A person is joining the red paper to the purple paper. 2-1. A person is joining the red paper and the purple paper with a paper

69. interview questions

can someone critique these questions for me please? Describe yourself: I was born in Somalia, but my family and I moved to the states when I was 7 yrs. I want to major in respiratory care and minor in biology. What are your strength/weaknesses. Well my

70. math

A quadrilater with 1 right angle,1 obtuse angles,and 2 acute angles. AM i correct to say that prallelogram is the answer.

71. English - to JJ

If my thesis is Social networking is a powerfull force in modern society. It helps us stay connected with friends, even if we don't show them the 'real' us and it has shaped current events and our views on these events... will my topic be about facebook or

72. chemistry

volume in liters of oxygen produced at STP when 57.4g of hydrogen peroxide decompose

73. Research Design

I need help describing the similarities and differences between quantitative and qualitative research.

74. Math

Hi, I have to write a research paper and I decided to write about the history/importance of imaginary numbers. I don't know how to get started though, can you please help ! :) thanks

75. Finance/Cost accounting

The XYZ Corporation is contemplating the introduction of a new machine tool which will be used solely in the manufacture of a rotor shaft. 50,000 units per year are expected to be manufactured, and the time study group anticpates a standard of 2.5 hours

76. mat/116

Solve 8x - (4x+4) =4

77. literature

What are the importance of soldiers home between 1865 to present. Can any one give me some points in the form introduction, 3 body paragraph and conclusion for this essay and i really need help in it.

78. french

i have a quiz monday on the verb VINIR, and on the quiz we have to make a chart on the passe compose, the imparfait, and the venir forms...any suggestions on how to study? this quiz is all on memorization...and i don't really have a good memory when it

79. math

Page 9 of 9 What is the probability that a point chosen at random on segment PQ will be between -1 and 3? -5 through 5

80. Environmental Science

I have to determine which kind of natural selection is most likely to begin speciation out of stabalizing, directional and disruptive. I would think Directional, since it favors one extreme which could eventually break away from the norm to the point a new

81. geometry

the area of a right triangle is 12 in ^2. the ratio of the lengths of its legs is 2/3. find the hypotenuse.

82. Stats

With normal approximation method and technology, is it necessary to use the one sample z test for proportion for large sample sizes instead of the binomial formula?

83. Comp/155

What strategies might a writer use to ensure pronouns are used effectively?

84. chemistry

write a balanced equation for this reaction. find out the mass of hydrogen chloride gas needed to react completely with 0.20 g of ammonia gas.

85. chemistry

calculate the mass of CO2 obtained when HCL reacts with 15g CACO3.

86. Math

Please show me how to enter this into scientific calculator the equation is 30*0.6637 - 29*0.6223*e^(-0.05*0.137) and the answer is 1.99 i don't know how to enter the e^(-0.05*0.137) part. please show me detailed steps. my scientific calculator is fx-991w

87. sociology

Why it is ok for Girl to wear boys clothes but deviant behavior for boy to wear girl clothes

88. Math

Hi, I have to write a research paper and I decided to write about the history/importance of imaginary numbers. I don't know how to get started though, can you please help ! By the way I know how to write a research paper so don't give me the links about

plz hurry, call fot help. nike product lines nike marjor accomplishments of the past few years competitive strategies plz give the point form.

90. chemistry

How do you find the moler mass of a compound like H2O?

91. Discrete Math

So = 2 S1 = 5 Sn = - Sn - 1 + nSn - 2, n >_ 2 How do I interpret the value of n? Is this number equivalent to S1, S0, or 2? I have tried each option; finding S3 is difficult because I don't know what value to multiply Sn-2 with, when solving for S2. Your

92. english

Not sure how to do this?? can anyone help? Incorporating Statistics, Graphs, and Illustrations o the different types of statistics, graphs, and illustrations that are appropriate for your topic. o Where do these visuals fit most effectively into your

An artillery shells is moving on a parabolic trayectory, when it explodes in midair. The shell chatters into a very large number of fragments. Which of the following statements is true? (Select all that apply.) A) A center of mass of the system of

94. mat/116

In 1195 the life expectancy of males in a certain country was 66.5 years. In 1999 it was 69.1 years. Let E rep. the life expectancy in years t and let t rep. the number of years since 1995

95. Pre-Calc

the equation of lin n is 8x - 14y + 3 = 0. what is k if he graphs of n and kx - 7y + 10 = 0 are perpendicular?

96. English

I did not realize how important it was to collaborate with the staff at school, such as janitors, until I need them in my room. Teachers have so many responsibilities, and for that reason, it is beneficial for evryone to have as much help as possible. Are

97. math

Laura want to purchase 4 shirts and 3 hat the cost of each shirt at Wm is$15.20.the cost of the hat at Wm is$5.200 the cost of the same shirt at Sm is 5 percent more than the cost at Wm the cost of the same hat at Sm is 2 percent more than the cost at Wm

98. english

is this a good tittle for an article.. "Causes and Treatments of Drug Addiction" my article talks about the risk factors and briefly about treatment... any suggested tittles ..

100. Encyclopedia

Does anyone have an encyclopedia at their house right now? Im looking for information on John A. Macdonald, and I signed out many books about him, but I also need a source of encyclopedia. If you have one at your house, could you please post all the

101. geometry

the area of a right triangle is 12 in ^2. the ratio of the lengths of its legs is 2/3. find the hypotenuse.

102. algebra

Joe earns $116 less per week then Tom. The combined income of two is$390 per week. how much does each person earn?

103. English

Explain Bernad Cohen's distinction between the media's telling us what to think as opposed to telling us"what to think about".

104. physics

how does the doppler effect relate to destructive interference?

105. French - SraJMcGin/Frenchy

Que remarquex-vous interessant dans tableau ..Aqueduct and Lock? English: [In painting, "Aqueduct et Lock", the scenery just amazes me, the reflection effect looks really nice] French: [ En tableaux, "Aqueduct et Lock", le paysage juste etones moi, le

106. ENGLISH

These sentences below is about is how the Entrepenuers are making money off of the gold miners. So, the sentences below are some part of a poem, which is: I thought: What will stampeders need? Now I’m a Dawson millionaire! I sell them ALL long underwear.

107. home economics

I have to make a cold dessert. I am thinking of making a trifle. I am not sure whether we will be able to heat the custard, can I use cold custard? Or is there something else I could use instead of custard. Any help would be good. Many thanks.

108. physics

Electromagnetic radiation (light) consists of waves. More than a century ago, scientists thought that light, like other waves, required a medium (called the ether) to support its transmission. Glass, having a typical mass density of ρ = 2770 kg/m3, also

109. Physics

An artillery shells is moving on a parabolic trayectory, when it explodes in midair. The shell chatters into a very large number of fragments. Which of the following statements is true? (Select all that apply.) A) A center of mass of the system of

110. English

Hello. Please help me with articles: "The opposition lost its seats in an/the(?)election last week." "All (the?)electoral bodies in the country are controled by the President." Thank you very much for your help.

111. xbis/219

I'm working on the Club IT Part 3. Is anyone here familiar with it because I can't find any figures to start with but the assignment requires that I create a budget!

112. English

Can you check these please? 1)It would be nice if our Italian students could start an e-mail exchange with their new American friends. 2)The committe has organized a buffet farewell party to wish the American students a good journey home. 3) What time are

113. French - SraJMcGin/Frenchy

In class we looked through some paintings of artists. After looking at them, we were given questions to answer, here they are. La Galerie D'art 1. Quelle est ta peinture preferee? Pourquoi? In English, this is what I want to say. [ My favourite painting

114. French - SraJMcGin/Frenchy

Avez-vous un(e) peinture favorite? English: [No I don't have a favourite painter. I like all the different kinds of styles that artists use in their paintings. Some appeal to me, and some do not, but there are many artists out there, which I really like.]

115. ENGLISH

What do these lines mean: I thought: What will stampeders need? Now I’m a Dawson millionaire! I sell them ALL long underwear.

116. physics

Electromagnetic radiation (light) consists of waves. More than a century ago, scientists thought that light, like other waves, required a medium (called the ether) to support its transmission. Glass, having a typical mass density of ñ = 2690 kg/m3, also

117. Math

If (e^x)^-2 X (e^x)^2 X e^x = 1/e^2 find x? I have no idea how to do this.

118. Geometry

what is the length of any diagonal of a regular pentagon with a side of 20mm?

119. mat/116

find the slope x= -6

120. Modern HIstory

Hi can someone explain to me how to do a research question/hypothesis for an analytical essay about Hitler? Thank-you The teachers explaination confused me!

121. grammar

Which one is correct? We will follow up the patient with a postop phone call? or We will follow up with the patient with a postop phone call?

122. math

What is the area of the trapezoid given top is 14, one side is 7, and bottom corner is 65°?

123. chemistry

what is fe+s+hcl=

124. phyiscs

Two persons watch the same object move john says that it accelerate straight downward, but Samantha claims that it falls Along curved path.describe the conditions under which each person would be reporting correctly what they see. Thanks and please please

125. precalc

find an equation of the tangent line to the parabola at the given point..show work y=(-2)x^2 (-1,-2)

126. French - SraJMcGin/Frenchy

I'm posting questions related to those paintings one by one. Detestez-vous une peinture? Laquelle? Pourquoi? English: [Yes, I hate the painting, "A Japanese Bridge", because it is not clear.] French: [Oui, je deteste la peinture, A Japanese Bridge, parce

127. chemistry

TNT (trinitrotoluene), an explosive, occurs naturally as an intermediate product of the decomposition of certain types of organic matter. Why does it not explode?

128. chemistry

TNT (trinitrotoluene), an explosive, occurs naturally as an intermediate product of the decomposition of certain types of organic matter. Why does it not explode?

129. physics

state 8 object each used in sport and welfare

130. physics

state 8 object each used in sport and welfare,which may be considered as projectile

131. english

Can someone check my answer and let me know if it is missing something? Make any necessary corrections to the following paragraph- look for sound alike words, verb tense shift, singular subject/pronoun agreement etc… Tom Greene, Director of Sales, was in

132. math

find mass of 2.7 grams of aluminum if mass is 1 cubic meters

133. algebra

algebra, write a quadratic equation in the variable x having the given numbers as solutions -ã10, 6ã10

134. computers

how can i make a website on telecommunication and its effects on society with the help of share point designer 2007

135. english

Would i capitalize son in a sentence?

136. Math

The length of a rectangle is fixed @ 21 cm, what widths will amke the perimeter greater than 78cm?

137. english

how to do an oral presentation on to decribe a formal wear superstore. i had to submit this assigment on monday 4th april.

138. college

x=(5m/s)t+ (0.75m/s3)t3 how do u find coordinates 4 the graph o u differentiate first?

139. Finance/Cost Accounting

You are given the following data: Annual demand is 1600 pieces Cost per piece is \$50 Cost of money factor is 30 percent What is the EOQ point?

140. physics -- waves

How does rarefraction affects the frequency of waves ?

If (e^x)^-2 X (e^x)^2 X e^x = 1/e^2 find x? I have no idea how to do this

a sentence describing a service with the word eminence.