Questions Asked on
September 19, 2009

  1. physics

    The height of a helicopter above the ground is given by h = 3.40t^3 , where h is in meters and t is in seconds. After 2.05 s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground?

    asked by Anonymous
  2. chemistry

    how to calculate delta h for the reaction 2B(s)+3H2(g)arrow B2H6(g)given the following data: 2B(s)+3/2O2(g)arrowB2O3(s) deltaH=-1273kj B2H6(g)+3O2(g)arrowB2O3(s)+3H2O(g) deltaH=-2035kj H2(g)+1/2O2(g)arrowH2O(l) deltaH=-286kj H2O(l)arrowH2O(g) deltaH=+44kj

    asked by georgina
  3. physics

    Secretariat ran the Kentucky Derby with times for the quarter mile of 25.2 s, 24.0 s, 23.8 s, and 23.0 s. (a) Find his average speed during each quarter-mile segment. (b) Assuming that Secretariat's instantaneous speed at the finish line was the same as

    asked by Anh
  4. Science

    suppose that you are given hand specimens of the carbonates calcite and dolomite. described two tests that would allow you to identify the samples. can someone help me on the question. plz and thank you

    asked by iNeedHelp
  5. Science

    can someone help one this question? suppose you are given two liquids and told that one is a compound and the other is a mixture. how might you determine which was which? describe one method you could use. please and thank you

    asked by iNeedHelp
  6. chemistry

    SrH2 (s)+ 2H2O (l) >>> Sr(OH)2 (s) + 2H2 (g) Calculate the mass of hydrogen gas that can be prepared from 5.22 grams SrH2 and 4.35 grams of H2O. I keep getting 0.729 grams but its wrong...

    asked by Some kid
  7. niagra falls geography

    what are the physical& human features of the Niagra falls

    asked by sirana loni
  8. English

    A question from Sir Knight and the Green Knight After the Green Knight addresses King Arthur and his Knights, King Arthur says, "By Heaven, Sir, your request is strange". What is the Green Knight's request?

    asked by Rick
  9. Physics (Trig Bit)

    A boy and a girl carry a 12.0 kg bucket of water by holding the ends of a rope with the bucket attached at the middle. FI tehre is an angle of 100.0 degrees between the two segments of the rope, what is the tension in each part? I do not understand the

    asked by Physics (Trig Bit)
  10. Chemistry

    The acid-base reaction between phosphoric acid, H3PO4, and calcium hydroxide, Ca(OH)2, yields water and calcium phosphate. For each mole of calcium phosphate produced by this reaction, how many moles of water are also produced?

    asked by Anonymous
  11. spanish

    I have to fill in the blanks using ser, estar and tener and Im having trouble with a few can somebody help me please. Ana y yo____bajas. Vosotros____buenos. Uds._____simpaticos Donde____mis cosas? De donde_____usted?

    asked by Jasmine
  12. chemistry

    How many milliliters of 0.418 M HCl are needed to react with 52.7 g of CaCO3? 2HCl (aq) + CaCO3 (s) >>> CaCl2 (aq) + CO2 (g) + H20 (l) I got .00252 mL but its wrong. This is what I did: 52.7 g x (1 mol CaCO3/100.09 CaCO3) x (2 mol HCl/ 1 mol CaCO3)= 1.05

    asked by Some kid
  13. math

    two joggers start at the same time from opposite ends of a 10-km course. One jogger is running at 6 km/h and the other is running at 10 km/h. How long after they begin will they meet?

    asked by taylor
  14. physics

    Sally travels by car from one city to another. She drives for 24.0 min at 63.0 km/h, 36.0 min at 45.0 km/h, and 44.0 min at 49.0 km/h, and she spends 13.0 min eating lunch and buying gas.

    asked by berha
  15. physics

    If you are holding a dumbbell in your hand, there are three forces acting, Weight of the arm pulling the arm down, a tension force that the muscle in the shoulder exerts on the arm, and the force that the dumbbell exerts on the fist.. which of these forces

    asked by sara
  16. physics

    A passenger walks from one side of a ferry to the other as it approaches a dock. If the passenger's velocity is 1.70 m/s due north relative to the ferry, and 4.5 m/s at an angle of 34.0° west of north relative to the water, what are the direction and

    asked by Anonymous
  17. chemistry.

    A chromium compound 28.4% by mass of sodium 32.1% by mass of chromium, the rest being oxygen. Determine the empirical formula of the compound?...Can any one help me for that?

    asked by Ochaya
  18. physics

    A large conducting plate of area equal to 4.0 m^2 has an evenly distributed surface charge of + 3.4 micro coulomb on its surface.A point charge of mass equal to 5.3 x 10^-6 kg and carrying a charge of 1.2 nC is held at 10 cm above the center of the

    asked by sandhu
  19. physics

    A thin ring of radius equal to 25 cm carries a uniformly distributed charge of 4.7 nC. What is the electric field and potential difference at the center of the ring?

    asked by sandhu
  20. com 220 essay writing

    what are some examples of bias, fallacies and specific rehortical devices in the Citizen kane speech. how did the speaker address arguments and counter arguments? were the speakers arguments effective? I just need help with the last part about

    asked by chris
  21. AP English

    Can I get an opinion on the following paragraph I wrote? This is a paragraph analyzing rhetorical strategies in Abraham Lincoln's Second Inaugural Speech. Lincoln addresses firmly that the sooner the Civil War will come to an end, the sooner Americans can

    asked by Anonymous
  22. MATH 157

    List the elements in the sample space of this experiment: a 6 sided die is rolled. the sides contain the numbers 1,2,3,4,5,6. list the sample space of rolling one die.

    asked by ggift
  23. physics - HELP

    A car accelerates at 2.25 m/s^2 along a straight road. It passes two marks that are 27.8 m apart at times t=3.80 s and t=5.25 s. What was the car's velocity at t=0?

    asked by Anonymous
  24. MATH 157

    If an 8 inch wide rectangle is to approach the golden ratio, what should its length be?

    asked by ggift
  25. Physics

    A car is traveling over the top of a hill, which we will model to be a piece of a circular arc of radius R. For each case below, draw careful to-scale motion maps and use them to construct the velocity vectors at the following three points: the top of the

    asked by Sonya
  26. Physics

    (a)A car travels exactly once around a circle of radius 5.0 m at constant speed of 3.0 m/s. What is the car’s average velocity (magnitude and direction) during this interval? Explain/justify. (b)Repeat the calculation of average velocity if the car

    asked by Sonya
  27. physics

    A particle moves along the x-axis according to the equation x = 50.0t + 10.0t^2, where x is in meters and t is in seconds. Calculate the average velocity of the particle during the first 2.30 s of its motion.

    asked by Anonymous
  28. math

    In a science class of 16 students, 11 are on the basketball team, and 7 are on the track team. What is the least number of students in this class who are on both teams? I got 2, is that right?

    asked by Michael
  29. math

    How many different integers can be expressed as the sum of three different numbers in the set (1,2,3,4,5,6,7)? Can anyone explain this one to me??? Thank you!

    asked by Michael
  30. Statistics

    The Econ Dpt final has 30 questions that are multiple choice. There are 5 possible answers. If you guessed the answers to all the questions, how many would you expect to get right. Choices are 6, 7.5, 7?

    asked by Jennifer
  31. history during the lives of early people

    I need help in how I can approach this assignment,so that I cover all the areas that are to be included and still write an interesting and quality paper, showing the ways of life during this time in history. The assignment reads like this:You are to write

    asked by Andy
  32. physics - HELP

    A parachustist jumps from an airplane and freely falls y=51.8 m before opening his parachute. Thereafter, he decelerates at a=1.86 m/s^2. As he reaches the ground, his speed is 3.04 m/s. a)How long was the parachutist in the air? b)At what height did the

    asked by Anonymous
  33. physics - HELP

    A very silly person, intent on catching pigeons on the roof of an apartment building, trips and falls a distance of 43.0 m. She lands on a metal garbage can, crushing it to a depth of 0.457 m and walks away without having been seriously hurt. What

    asked by Anonymous
  34. algebra

    how to factor 8x^3+27?

    asked by chekosm
  35. physics

    A large conducting plate of area equal to 4.0 m^2 has an evenly distributed surface charge of + 3.4 micro coulomb on its surface.A point charge of mass equal to 5.3 x 10^-6 kg and carrying a charge of 1.2 nC is held at 10 cm above the center of the

    asked by sandhu
  36. Physics

    A thin ring of radius equal to 25 cm carries a uniformly distributed charge of 4.7 nC. What is the electric field and potential difference at the center of the ring?

    asked by sandhu
  37. math

    (5x)+14=14+(5x)is this associative property of addition?

    asked by natasha
  38. American History

    If Governor George Wallace Was Alive During Reconstruction, What Would His Plan For The South Be After The Civil War? I am taking on the roll of Wallace in a Reconstruction Roundtable and i need help answering this.

    asked by Jake
  39. Economics

    1. What effect would a decrease in consumer savings have on the aggregate demand curve? The curve would level off. The curve would shift to the right. The curve would shift to the left. The curve would not change 2. If there is an increase in aggregate

    asked by Chris
  40. physics

    A very silly person, intent on catching pigeons on the roof of an apartment building, trips and falls a distance of 43.0 m. She lands on a metal garbage can, crushing it to a depth of 0.457 m and walks away without having been seriously hurt. What

    asked by Anonymous
  41. trig

    I'm trying to see if the teacher didn't give us the right problem or if I'm just not getting it. The problem is "re-write the expression without a fraction: 4/(1-sin x)". I can do it if the problem is sin squared x but I don't know how to solve the problem

    asked by Priscilla
  42. physics

    A car accelerates at 2.25 m/s^2 along a straight road. It passes two marks that are 27.8 m apart at times t=3.80 s and t=5.25 s. What was the car's velocity at t=0?

    asked by Anonymous
  43. chemistry

    Potassium permanganate reacts with sulfuric acid as per the equation shown below. Indicate the excess reactant after the reaction of 7.60 g KMnO4 and 10.32 g H2SO4. 4 KMnO4 (aq) + 6H2SO4 (aq) + 2K2SO4 (aq) + 4MnSO4 (aq)+ 6H2) (l) + 5O2 (g) I have no idea

    asked by Some kid
  44. math

    There is a rectangular piece of land that measures 40ft by 70 ft in the middle there is a square sandbox that is 6 ft on each side the rest of the land is covered in grass what percent of the land is covered by grass rounded to the nearest tenth of a

    asked by p
  45. writing messages

    informative,negative,positive messages

    asked by Anonymous
  46. Algebra

    Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour, and your city is the first stop on the tour. You need to supply information about projected ticket sales to the box office

    asked by Jerry
  47. math

    1. kristi jogged for 3/5 of an hr,swam 1/2 of an hr, rode her bike 3/4 of an hr how long did she exercise?=1 7/20 2.the intersest rate on an equity line of credit was 7 7/8% last month this month the interset rate is 10 3/2% how many percentage points has

    asked by p
  48. Government

    What are 15 ways in which the US government helps us in our daily lives? Local, state, and federal?

    asked by .
  49. math

    lcm of 150,36,245 =44100 ?

    asked by p
  50. Trigo!

    Ok, i did this maths trigo question, that says sinx-cos=2/3. I squared it on both sides to get sin2x=5/9 and did the sum. In the end i got two solutions, 16.9 and 73.1. However, when i substituted the answers back into the equation, only one of the 2

    asked by help!
  51. chemistry

    How many moles of excess reactant are present when 3.50 x 10^2 mL of 0.216 M sulfuric acid reacts with 0.510 L of 0.202 M sodium hydroxide to form water and aqueous sodium sulfate?

    asked by larry
  52. math

    There is a rectangular piece of land that measures 40ft by 70 ft in the middle there is a square sandbox that is 6 ft on each side the rest of the land is covered in grass what percent of the land is covered by grass rounded to the nearest tenth of a

    asked by p
  53. social studies

    do i have to do all my homework its so hard! i hate this! i hate this subject!

    asked by miley
  54. writing

    how do i write a rough draft using apa style format for a project mananger

    asked by james
  55. math

    I have to put these estimates on a circle graph. These are estimated deaths in canada in 1996. Do I add them all up first then divide them by the answer? murders 510 alchcol 1900 car accidents 2900 suicides-3900 Tobacco 45,000

    asked by sophia
  56. 11th grade

    Is malleability an extensive property or an intensive property? Explain.

    asked by stephany
  57. 7th grade

    Truck Company charges $40 per day & an additional $2 for each mile driven. Make a table of the charges for renting a truck for 5 days and driving it 0.25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, and 300 miles.

    asked by Sharon
  58. latin

    what is the latin abbbreviations for speak at will, and the rest, against, afterthought, and others, take this, and which see? what is the meaning of the latin words ad lib, vs, cf, and q.v.

    asked by anthony
  59. physics

    A parachustist jumps from an airplane and freely falls y=51.8 m before opening his parachute. Thereafter, he decelerates at a=1.86 m/s^2. As he reaches the ground, his speed is 3.04 m/s. a)How long was the parachutist in the air? b)At what height did the

    asked by Anonymous
  60. physics

    Tension is: ---------A contact-free force ---------A contact force ---------A specific form of energy ---------A pressure value corrected for the air pressure

    asked by Hannah
  61. math

    sove for x. 1. 2/3(x+4)=8 round the results to the nearest tenth and then to the nearest hundredth: 2. -57.124/10.104 3. -13.254(-3.145)

    asked by naz
  62. Algebra I

    The sum of three numbers is 147. The second number is 4 more than two times the first number. The third number is five less than three times the first number. Find the three numbers. Can you please solve it? I have no idea how to do this. Thanks a lot for

    asked by katya
  63. math

    just want to chack my answers: 1. Find the least common multiple of 3, 6, and 9. A-36? 2.Add. Write the answer in simplest form.3/11+9/11+1/11= 1 2/11? 3.Four buttons have diameters of 5/8,3/4 ,9/16 ,7/8 and inches. Which button is smallest? A~9/16?

    asked by A~
  64. business

    with what information do I use to create an table that lays out a day-by-day plan to use as a job aid for an employment search, spanning 3 weeks?

    asked by Anonymous
  65. socials

    charles I and the civil war 2 1642-49 what advantages had the king? nobles and country squires made good horse-soldiers. They brought the men on their estates into battle for the king, and Rupert,the king's nephew, was an excellent cavalry leader. this is

    asked by sara
  66. Criminal Justice

    why organization is important to the effectiveness of the police department. Topics include the following: area purpose and time

    asked by Amanda
  67. algebra

    F=G((mM)/(d^2)), solve for d

    asked by Eleonora
  68. math

    F=G((mM)/(d^2)), solve for d I need to know the steps, so I know how to do it in the future. Thanks

    asked by Elie
  69. english

    what is the purpose for writing of plymouth plantation by william bradford?

    asked by bindiya farswani
  70. College Algebra

    Knowing the given conditions, write the equation of the circle. Center at (5,3) and tangent to the y-axis.

    asked by Adrian
  71. spanish

    who wrote don quijote?

    asked by reymond
  72. Technology

    I need help with my entry essay, "The Twentieth Century brought an explosion of discoveries and inventions in math, science, and technology. Choose one such discovery or invention, identify it, and name the people responsible. Then explain how this

    asked by Aaron
  73. ap chemistry

    give an example of an organic compund made from inorganic substances

    asked by Izzy
  74. math

    Which chart would be more effective a bar graph or pie chart?

    asked by candy
  75. MATH

    Show that if the equation of the line can be written as x/a + y/b = 1, then the line intersects the x-axis at (a, 0) and the y- axis at (0,b). i`m lostt.

    asked by DiANA
  76. essay

    I am writing an essay for school and I need some more ideas about why do we need healthcare? can you give me some ideas how to start it off to make a very good essay

    asked by chris
  77. chemistry.

    Deduce the number of each sub-atom particle in an atom of 84Kr?.

    asked by Cool boy.
  78. math

    It takes 125 identical wooden cubes to fill a cubical box. How many of these cubes does it take to cover the bottom of the box? Could someone explain this one to me?

    asked by Michael
  79. math

    can you check please/ 1.Rochelle purchased an appliqance that cost $815.56 with interest included. She paid $250.00 as a dwn payment and agreed to pay the remainder in 18 monthly payments. What amount will she be paying per month? =31.42 2.find the

    asked by p
  80. Math thanks, Reiny

    Thanks Reiny!

    asked by Michael
  81. science

    what is the similarities and difference between an igneous rock and a metamorphic rock? please help and thank you =)

    asked by help
  82. Ecology

    A space can hold a maximum of 256 paramecia before over-crowding. The paramecium undergoes 8 cell divisions before over-crowding. Suppose that the paramecium takes 2 hours to divide one, how many hours will it take the paramecium to reach maximum capacity?

    asked by Brooke
  83. math

    can you check please/ 1.Rochelle purchased an appliqance that cost $815.56 with interest included. She paid $250.00 as a dwn payment and agreed to pay the remainder in 18 monthly payments. What amount will she be paying per month? =31.42 2.find the

    asked by p
  84. english canterbury tales

    I took a practice quiz from an online site and I cant figure out these three quotes - the person they were said about is at the end of the quote. 1. This little proverb he would add thereto That if gold rust, then what will iron do?' parson 2. 'A thumb of

    asked by sam
  85. french

    Hi, I just have these few sentences or fragments that I cannot figure out whats wrong, can someone help? J¡¯ai assist¨¦ ¨¤ six semaines programme ¨¦t¨¦ au RISD (I attended a six week summer program at RISD) ! Je n'ai pas vu beaucoup de lieux

    asked by French Help please!
  86. social studies

    what impact did the establishment of french and dutch colonies in north america have on native americans?

    asked by ac
  87. world history

    (This is not a homework question just curious) Did Christopher Columbus change the lives of the native americans

    asked by Carrie
  88. Physics

    Could someone tell me the formula for finding distance when time is given and the acceleration is constant?

    asked by Anonymous
  89. physics

    A baseball pitcher throws a ball with a maximum speed of 150. km/h. If the ball is thrown horizontally, how far does it fall vertically by the time it reaches the catcher's glove 20. m away? Give your answer numerically in meters using decimal notation

    asked by Michael
  90. Math

    Solve the equation using order of operations. -22+105+(-37)+23+22+37+(-105)

    asked by Annia
  91. Science

    What is the Newtons Laws

    asked by Madison
  92. accounting

    Review the following illustrations found in Ch. 6 of your text: 6-12, 6-15, 6-17, 6-18, 6-19, & 6-20.  Write a 350- to 700-word paper, using APA guidelines, that addresses the following: o Explain the components of cost-volume-profit

    asked by lady
  93. gr.10 math!

    factor the equation: -6x^2+15x+36 please show me the steps in answering this problem. thanksss..)

    asked by Saira
  94. religion

    How do contemporary Buddhist practices reflect the foundations of the religion?

    asked by ron
  95. socials

    charles I and the civil war 2 1642-49 name a parliamentary victory of 1644 on july 2nd 1644 when the royalist forces were busy cooking their suppers, the roundheads made a surprise attack , scattered the royalist forces and won the vital battle of marston

    asked by sara
  96. Physics

    A spaceship approaches Starbase Beta with an initial velocity moving in the +x direction. The ensign sets the ship’s computer to initiate a braking program starting at time t = 0. After this time the computer controls the ship’s x-velocity according to

    asked by Sonya
  97. Trigo help!

    Ok, i've tried this question, and it brings me to no answers. Please help! Prove the following: secY(1+tanY)=6cosecY my workings: LeftHandSide: secY + tanY/cosY = 1/cosY + sinY/cos^2Y =(cosY+sinY)/cos^2Y = ??? How should i attempt this question?? Am i even

    asked by help!
  98. physics

    Three vectors are given by = 1.0 + 3.0 + -4.7, = 2.0 + 2.0 + -4.0, and = 3.0 + -4.2 + -4.0. Find (a)·( × ) and (b)·( + ).

    asked by blah
  99. science

    What are two organisms that are classified in the same class will alwas be classifed in the same

    asked by Camille
  100. hygiene

    what is the ideal temperature for a freezer

    asked by danielle drury
  101. health care

    What role do health care workers play in determining quality care?

    asked by jaackie
  102. Math

    1) If you have an inhomogeneous, linear equation like f''(x) + f'(x) + f = x you can find the general solution by finding a particular solution (with no constants of integration)to this equation and adding it to the general solution to the homogeneous

    asked by Sonya
  103. algerbra

    what is 3x+45=62?

    asked by lola
  104. Geography

    How does Geography impact the lives of people?

    asked by Troy
  105. scince

    what does the cross in the warning signs mean?

    asked by liam
  106. science

    What does in science the 'cross' mean in the warning sounds?

    asked by zack
  107. 7th grade

    what do geographers want to know about peoples movement?

    asked by maxine
  108. religion

    how does the typical person define the word 'Christian'?

    asked by gregg
  109. religion

    what do yuou think when you hear the word 1) jewish 2) muslim 3) christian 4) righteousness NO LINKS PLEASE all answers are appreciated

    asked by NEED HELP
  110. art

    I just need to know who made the'bauta mask"?

    asked by lily
  111. U.S. History

    What exactly were the colonists' reactions after the King issued the Proclamation of 1763? I know "shocked" and "feeling like they can't doing anything without England stepping in" are the obvious ones, but was there anything really specific? On the

    asked by Nikki
  112. Criminal Justice

    Should the government be able to give up its responsibility for the custody of an individual and engage in contracts with private organizations to provide privatization of prisons in jail?

    asked by Sherri
  113. Math

    Which is closer to 14%,1/6 or 1/8?

    asked by Annia
  114. Math

    What is the average of seven numbers if the average of the first two is 9 and the average of the last five is 15?

    asked by Rebecca
  115. 6th grade

    Multiply 13*(-7)

    asked by Amber
  116. Microeconomics

    How do u make a graph using type of prodution ABCDE automobiles 02468 and forklifts 30 27 21 12 0

    asked by Eshanna
  117. Economics

    Can it ever be wise to produce even if total cost exceeds total revenue?

    asked by Jay Tillman
  118. Microeconomics

    How do u make a graph using type of prodution ABCDE automobiles 02468 and forklifts 30 27 21 12 0

    asked by Eshanna
  119. Microeconomics

    How do u make a graph using type of prodution ABCDE automobiles 02468 and forklifts 30 27 21 12 0

    asked by Eshanna
  120. History

    Which amendment banned discrimination between genders?

    asked by Don
  121. Algebra

    Find the x and y intercepts: y=x^2-3

    asked by Help
  122. psychology/english

    what would you say is the definition of biological psychology?

    asked by frankie
  123. geography

    tips on how las vegas can conserve water?

    asked by Abee
  124. Chemistry

    ? CaSO_4 + AlCl_3 ---> CaCl_2 + Al_2(SO_4)_3 How do I balance this equation so that there are the same number of sulfate ions on both sides of the equation?

    asked by Cory
  125. MATH 157

    Wouldn't you use milligrams to express the mass of a flower petal?

    asked by ggift
  126. Trigo!

    Ok, i've tried this sum a million times and i cant get an answer. Somebody please check my workings and tell me what i did wrong! Thanks! Given 4≤y≤6, find the value of y for which 2cos((2y)/3) + √3 = 0 Here's my workings: 2.666≤(2y/3)≤4

    asked by help!