## Most Popular Questions of 2009

1. ### Chemistry: Electron Configurations

Write the electron configuration for the following ion. V3+ I got 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. In simplified form, I got [Ar]4s^2. I checked my answer against the answer given in the back of my chemistry textbook, and the two didn't correspond. The

asked by Anonymous on November 4, 2009
2. ### math

what is the title of this picture?

asked by Jena on January 21, 2009

What did the spanish farmer say to his chicken

asked by joe on October 21, 2009
4. ### Chemistry

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)? A) 0.40 M B) 0.10 M C) 0.20 M D) 0.25 M E) 0.36 M The answer is supposedly C, but I got A.

asked by Charlie on December 8, 2009
5. ### Physics

An 80- quarterback jumps straight up in the air right before throwing a 0.43- football horizontally at 15 . How fast will he be moving backward just after releasing the ball? Suppose that the quarterback takes 0.30 to return to the ground after throwing

6. ### Honors Chemistry

"How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2? N2 + 3H2 ---> 2NH3 ==> 28 g N2 x (1 mol N2/14.0 g N2) x (2 mol NH3/1 mol N2) x ( 17.0 g NH3/ 1 mol NH3) = 68 g NH3 25 g H2 x ( 1mol H2/2.0 g H2) x (2 mol NH3/3 mol H2) x

asked by Emily on November 8, 2009
7. ### science

a ball is thrown straight upward and returns to the thrower's hand after 3.00s in the air. A second ball is thrown at an angle of 30.0 deg with the horizontal. At what speed must the second ball be thrown so that it reached the same height as the one

asked by tani on September 8, 2009
8. ### physics

a jet pilot takes his aircraft in a vertical loop. a) if the jet is moving at a speed of 2000 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0g's

asked by jeffery on October 4, 2009
9. ### math ws

what do you call it when someone pays back a loan quickly? thanks for any help

asked by maryanna on March 1, 2009
10. ### Physics

A 75 kg box slides down a 25.0 degree ramp with an acceleration of 3.60 m/s^2. Find coefficient between the box and the ramp. What acceleration would a 175 kg box have on this ramp?

asked by Terrence Eko on November 12, 2009
11. ### spanish help quick!!! i have to submit my answers!

so we are learning the pred. v imperfect but i don't know when to use which i sort of have an idea like habitual inturrupting etcetc but i get them all wrong El lunes pasado yo _tuvé__ una discusión con un compañero de clase. La discusión __comenzaba_

asked by hayden on February 21, 2009
12. ### Physics

In a hydroelectric dam, water falls 26.0 m and then spins a turbine to generate electricity. What is ∆U of 1.0 kg of water? Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must

asked by Zach on November 30, 2009
13. ### physics

A wave of amplitude .30 m interferes with a second wave of amplitude .20 m. What are the largest and smallest displeacements that can occur? What type of interference is demonstrated by each displacement?

asked by Lee on September 8, 2009
14. ### Physics Problem

A runner hopes to complete the 10,000m run in less than 30 minutes. After exactly 27 minutes, there are still 1100m to go. The runner must then accelerate at 0.20 m/s^2 for how many seconds in order to achieve the desired time? I get 80.9 but I know that

asked by Zack on August 30, 2009
15. ### chemistry

Calculate the delta H for the reaction N2H4(l)+ O2(g) --> N2(g) + 2H20(l) Given the following data: 2NH3(g) + 3N20(g) --> 4N2(g) + 3H20(l) N20(g) + 3H2(g) --> N2H4(l) + H20(l) 2NH3(g) + 1/2O2(g) --> N2H4(l) + H20(l) H2(g) + 1/2O2(g) --> H20(l)

asked by kilo on October 28, 2009
16. ### algebra 1 page 167 did you hear about...

i need to finish the riddle. did you hear about... who knows this?

asked by faith on February 22, 2009
17. ### Physics

A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28degrees above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively.

asked by Ashley on September 25, 2009
18. ### physics

Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at starting line but has

asked by help on September 27, 2009
19. ### Chemistry

What is the ionic and net ionic equation for Na2CO3 + 2 HNO3 -> 2 NaNO3 + H2O + CO2 (g) This is what i have so far... Na2(aq)+CO3+H+NO3 -> Na+ NO3+ H2O(l)+CO2(g)... i don't know what to do!!!

asked by Christina on November 3, 2009
20. ### Physics

The drawing shows a large cube (mass = 25 kg) being accelerated across a horizontal frictionless surface by a horizontal force . A small cube (mass = 4.0 kg) is in contact with the front surface of the large cube and will slide downward unless is

asked by Litany on November 13, 2009
21. ### PHYSICS

a child sitting 1.10 m from the center of a merry go round moves with a speed of 1.25 m/s. calculate the centripetal acceleration of the child and the net horizontal force exerted on the child (mass = 25 kg).

asked by Sasha on November 3, 2009
22. ### Math

How much longer (percentage) is a one-mile race than a 1500- race?

asked by Carrie on August 28, 2009

Rank these liquids by their expected surface tension. Rank from greatest to least surface tension. 1.CH3CH2OCH3 2.CH3CH2CH2-OH 3.CH3CHOHCH2-OH 4.HO-CH2CHOHCH2-OH So as Dr. Bob mentioned to me before surface tension is how the surface molecules stick

asked by Saira on January 19, 2009
24. ### biology

LIST AND EXPLAIN FIVE USES OF SCIENCE

asked by KATE on September 23, 2009
25. ### chem

Does baking soda and vinegar have a complete ionic equation? HC2H3O2 (aq) + NaHCO3 ===> NaC2H3O2(aq) + H2CO3(aq)----->H2O(l)+CO2(g)+2H2O(l)

asked by Lou on September 30, 2009
26. ### physics

A cylinder that has a 40.0 cm radius and is 50.0 cm deep is filled with air at 20.0°C and 1.00 atm. A 21.0 kg piston is now lowered into the cylinder, compressing the air trapped inside. Finally, a 79.0 kg man stands on the piston, further compressing the

asked by Jessi on August 23, 2009
27. ### Chemistry

write a net ionic equation for? 2KI + Pb(NO3)2 ==>2KNO3 + PbI2 This is my answer below 2I^- + NO3==>2No3 +I2^- can anyone tell me if this is the correct answer

asked by Aparicio on June 10, 2009
28. ### chemistry

Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is

asked by Katie on December 6, 2009
29. ### Chemistry

Identify any incorrect formulas. explain your answer. a. Mg2(SO4)3 b. Rb3As c. BeCl3 d. NaF

asked by Minny on November 5, 2009
30. ### Pre-Algebra

What do they call the International Hula Hoop Championships?

asked by Mikayla on September 15, 2009
31. ### MACROECONOMICS

Which of the problems in the construction of the CPI might be illustrated by each of the following situations? Explain. a. the invention of the Sony Walkman b. the introduction of air bags in cars c. increased personal computer purchases in response to a

asked by SARA on April 12, 2009
32. ### math

What is the greatest prime number you must consider to test whether 5141 is prime?

asked by timothy on July 20, 2009
33. ### maths

a man loses 12.5% of his money & after spending 70% of the remainder , he was left with Rs 210/- . the money he had at the beginning is?

asked by rupesh on October 21, 2009
34. ### Chemistry

In which orbital does an electron in a phosphorus atom experience the greatest effective nuclear charge? a. 1s b. 2s c. 2p d. 3s e. 3p I originally thought 3p, since those are the outer electrons, but that was marked wrong. Why is it not 3p? Is the right

asked by C. on November 14, 2009
35. ### physics

A 0.400 kg ball is shot directly upward at initial speed 40.0 m/s. What is its angular momentum about a point 2.0 m horizontal from the launch point, when the ball is a) at maximum height and b) halfway back to the ground? What is the torque on the ball

asked by jane on June 13, 2009
36. ### chemistry

the quantity of electricity required to reduce 12.3g of nitrobenzene to aniline assuming 50% current efficiency is 1. 115800 C 2. 57900 C 3. 231600 C 4. 28950 C

asked by hriday on March 2, 2009
37. ### chemistry.

What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass?

asked by mary. on September 27, 2009
38. ### sat essay

Can any obstacle or disadvantage be turned into something good? Obstacles, which are the essential part of our lives, often seem to prevent us from reaching our goals and frustrate us. Therefore, most people think that difficulties are bound to exert

asked by Mercedes on November 5, 2009
39. ### math

Why couldn't the two elephants go swimming together?

asked by bob on March 17, 2009
40. ### Physics

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.00 m/s and angle of 20.0 degrees below the horizontal. It strikes the ground 3.00 s later. (a) If the base of the building is taken to be the

asked by Vico on September 21, 2009
41. ### Math

What did they call the duck who became a test pilot? (no it is not firecracker) (its 13 letters) (the worksheets box thing is sk y s af e il ly be er st qu it i a du ck mb in h er up)

asked by skoolgurl on January 5, 2009
42. ### chem.

A sample of argon at 300. °C and 50.0 atm pressure is cooled in the same container to a temperature of 0. °C. What is the new pressure? 105 atm 45.5 atm 54.9 atm 23.8 atm 42.7 atm

asked by Anonymous on September 29, 2009
43. ### Home Economics(sewing)

1)what does the term "disposal of fullness" mean? 2)What are 4 methods of controlling fullness and how is that method done? 3)What are 5 reasons why people dispose of fullness? 4)CAN YOU SEND ME THE NAME OF A WEBSITE(S) THAT HAS PICTURES OF GARMENTS

asked by kerry-Ann on April 9, 2009
44. ### chemistry

Nitrogen (N2) and hydrogen (H2) react to form ammonia (NH3). Consider a mixture of six nitrogen molecules and six hydrogen molecules in a closed container. Assuming the reaction goes to completion, what will the final product mixture be? number of NH3

asked by lyne on January 23, 2009
45. ### ap us history

list ten political and economic reforms the Populists proposed in their platform during the populist movement

asked by electra on November 20, 2009
46. ### Chemistry

Le Chateleir`s Principle Please check if my answers are right and i dunt know some of them: Consider the following system at equilibrium: A(aq)+B(aq) 2C(aq) Classify each of the following actions by whether it causes a leftward shift, a rightward shift, or

asked by Saira on February 5, 2009
47. ### Physics

A potter’s wheel with rotational inertia of 45 kg m2, is spinning freely at 40 rpm. The potter drops a lump of clay onto the wheel where it sticks a distance 1.2 m from the rotational axis at the wheel’s center. If the subsequent angular speed of the

asked by Sarah on June 29, 2009
48. ### Univ-Phys

One car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 5.0m/s, they then have the same kinetic energy. What were the original speeds of the two cars?

asked by Taylor on October 7, 2009
49. ### physics

A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 38.0 directed at an angle of 41.0 below the horizontal and the chair slides along the floor.Using Newton's laws, calculate , the

asked by Mary on September 23, 2009
50. ### Chemistry

A dry mixture of kno3 and sand could be separated by 1. adding water to the mixture and filtering 2. adding water to the mixture and evaporating 3. heating the mixture to a high temperature 4. cooling the mixture to a low temperature

asked by . on April 13, 2009
51. ### english

What is a simile, idiom, or metaphor for relief?

asked by Dani on February 3, 2009
52. ### Physics

a model of a helicopter rotor has four blades, each 3.40 m in length from the central shaft to the tip of the blade. The model is rotated in a wind tunnel at 550 rev/min. A) what is the linear speed, in m/s of the blade tip? B.) what is the radial

asked by Sarah on June 7, 2009
53. ### physics

you are standing on one side of the river. Figure out the width of the river. All calculations have to be made on the side you are standing on. You cant step into the river or cross it. You may use the 2 laws ( sine and cos ). no guessing allowed. has to

asked by just wondering on September 12, 2009
54. ### chem

Arrange the following amines in order of decreasing base strength. NH3, NH2Br, CH3NH2, (CH3)2NH

asked by help!!! on February 16, 2009
55. ### AP GOVT

The 25th amendment describes the sequence of events that would install the vice president as acting president against the will of the president. Outline that sequence of events.

asked by Jordan on August 17, 2009
56. ### statistics help needed

In the game of roulette, a steel ball is rolled onto a wheel that contains 18 red, 18 black, and 2 green slots. If the ball is rolled 24 times, find the probability of the following events. A. The ball falls into the green slots 4 or more times.

asked by Jordana on February 22, 2009
57. ### Chemistry

Consider the following equilibrium process at 700°C: 2H2 + S2 ↔ 2H2S Analysis shows that there are 2.50 moles of H2, 1.35x10^-5 mole of S2, and 8.70 moles of H2S present in a 12.0-L flask. Calculate the equilibrium constant Kc for the reaction.

asked by Chris on March 9, 2009
58. ### Calc

The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function below, where I is the light intensity (measured in thousands of foot-candles). P = (120 I) / (I^2 + I + 1) For what light intensity

asked by Aaron on November 30, 2009
59. ### Math

why didn't klutz do any home work on saturday also what did the girl melon say when the boy melon proposed marriage

asked by Sam on April 15, 2009
60. ### physics

A man can throw a ball a maximum horizontal distance of 97.8 m. The acceleration of gravity is 9.8 m/s2 . How far can he throw the same ball verti- cally upward with the same initial speed? Answer in units of m.

asked by Letisha on November 25, 2009
61. ### Physics

Christian is making a Tyrolean traverse. That is, he traverses a chasm by stringing a rope between a tree on one side of the chasm and a tree on the opposite side, 25 m away. The rope must sag sufficiently so it won't break. Assume the rope can provide a

asked by Precilla on September 23, 2009
62. ### Calculus

The population of a region is growing exponentially. There were 40 million people in 1980 (when t=0) and 50 million people in 1990. Find an exponential model for the population (in millions of people) at any time t, in years after 1980. P(t)= Predicted

asked by Z32 on October 6, 2009
63. ### chem

6) How many significant figures should be retained in the result of the following calculation? 12.00000 x 0.9893 + 13.00335 x 0.0107 A) 2 B) 3 C) 4 D) 5 I thought it was 3, but it is 4. Can you please explain to me

asked by Loi on March 11, 2009
64. ### Chemistry

For the reaction shown, compute the theoretical yield of product (in grams) for each of the following initial amounts of reactants. 2Al(s) +3 Cl2(g) ---> 2 AlCl3(s) A. 2.5gAl , 2.5g Cl2 B. 7.7 g Al , 25.2 g Cl2 C. 0.240 g Al , 1.10 g Cl2

asked by anonymous on February 11, 2009
65. ### Physics

A race car moves such that its position fits the relationship x = (5.0 m/s)t + (0.75 m/s3)t3 where x is measured in meters and t in seconds. (a) Plot a graph of the car s position versus time. (b) Determine the instantaneous velocity of the car at t = 4.0

asked by annemarie on August 8, 2009
66. ### Alegra II

Why isn't a snowman very smart?

asked by Sue on February 10, 2009
67. ### physics

a 330 kg piano slides 3.6 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. the effective coefficient of kinetic froction is 0.4. calculate a) the force exerted by the man, b)the work done

asked by Nat on April 27, 2009
68. ### Physics

A 2.0 kg mass starts from rest and slides down an inclined plane 8.0 X 10^-1 m long in .50s. what net force is acting on the mass along the incline. I have no idea how to do this I don't know why they just didn't say .8m the back of the book says 13 N down

asked by physics on January 28, 2009
69. ### 12th Physics

A 55 kg ice skater is at rest on a flat skating rink. A 198 N horizontal forceis needed to set the skater in motion.However, after the skater is inmotion, a horizontal force of 175 N keeps the skater moving at a constantvelocity. Find the coefficients of

asked by Melissa on December 8, 2009
70. ### CALCULUS

Rate of Change You are given the dollar value of a product in 2008 and the rate at which the value of the product is expected to change the nest 5 years. write a linear equation that gives the dollar value V of the product in terms of the yeart.(let t= 0

asked by kim on September 26, 2009
71. ### calculus

A man launches his boat from point A on a bank of a straight river, 3 km wide, and wants to reach point B, 2 km downstream on the opposite bank, as quickly as possible. He could row his boat directly across the river to point C and then run to B, or he

asked by Avilene on December 4, 2009
72. ### Chemistry

Consider each of the following reactions and decide whether the standard entropy change for the reaction will be, (a) Positive; or (b) Very close to Zero; or (c) Negative. Matching pairs N2 (g) + 3 H2 (g) = 2 NH3 (g) Mg (s) + CO2 (g) = MgO (s) + CO (g)

asked by Chem Lover on November 28, 2009
73. ### phys

An airplane is heading due south at a speed of 590 km/h. If a wind begins blowing from the southwest at a speed of 65.0 km/h (average). Calculate magnitude of the plane's velocity, relative to the ground. Calculate direction of the plane's velocity,

asked by physics on September 15, 2009
74. ### Chemistry-Repost

Write formula equations and net ionic equations for the hydrolysis of sodium carbonate in water. Responses Chemistry - DrBob222, Friday, April 24, 2009 at 10:50pm The hydrolysis of Na2CO3 ends us as the hydrolysis of the carbonate ion. The molecular

asked by anonymous on April 25, 2009
75. ### Chemistry

What is the final concentration (M) of a solution prepared by diluting 50.0 mL of a 6.00 M KCl solution to a volume of 0.500 L? A. 1.67 B. 0.600 C. 0.0167 D. 3.0 E. none of these My initial thought was to take the 6.00 M KCl/0.500 L, for an answer of 12.

asked by Coug on November 21, 2009
76. ### math

why did Simeon Wrench sleep under his car?

asked by fgytf on July 6, 2009
77. ### Chemistry

What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction? 2C6H6(l)+15O2(g)-->12CO2(G)+6H2O(g) :delta:Hrxn=-6278kj

asked by Gweedo8 on July 6, 2009
78. ### chem

Arsenic acid (H3AsO4) is a triprotic acid with Ka1 = 5 10-3, Ka2 = 8 10-8, and Ka3 = 6 10-10. Calculate [H+], [OH -], [H3AsO4], [H2AsO4-], [HAsO42-], and [AsO43-] in a 0.20 M arsenic acid solution. i cant do this. i don't even know how to start.

asked by Cab on February 15, 2009
79. ### math

8 basketball players are selected to play in a special game.the players will be selected from a list of 27 players .if the players are selected randomly ,whats the probability that the 8 tallest players will be selected.

asked by rency on October 27, 2009

how do you know when something has energy?

asked by hanna on April 15, 2009
81. ### physics

if a car is accelerating downhill under a net force of 3674 N, what force must the brakes exert to cause the car to have a constant velocity?

asked by regular joe on October 31, 2009
82. ### Physics

Two dogs pull horizontally on ropes attached to a post; the angle problem 1 between the ropes is 60.0 degrees. If dog A exerts a force of 270N and dog B exerts a force of 300N find the magnitude of the resultant force and the angle it makes with dog A's

asked by Sarah on June 8, 2009
83. ### english

what does these quote mean? 1.)"my life for itself and not for a spectacle" 2.)An institution is the lengthened shadow of a man. 3.) Life only avails, not the having lived. 4.) Insist on yourself; never imitate Thanks for your help!

asked by jess on January 4, 2009
84. ### Physics

A bowling ball weighing 71.2 N is attached to the ceiling by a 3.80 m rope. The ball is pulled to one side and released; it then swings back and forth like a pedulum. as the rope swings through its lowest point, the speed of the bowling ball is measured at

asked by Sarah on June 15, 2009
85. ### Chemistry Equations

What's the equation for the formation of NO2(g) from its elements in its standard states? What's the equation for the formation of BF3(g) from its elements in its standard states? What's the equation for the formation of C2H5OH(l) from its elements in its

asked by Kyle on November 5, 2009
86. ### chemistry

The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal contact and the combination is isolated. The final temperature of both objects is:

asked by matt on June 22, 2009
87. ### physics HELP

which unit is equivalent to meters per second? a. hz*s b. hz*m c. s/hz d. m/hz

88. ### chemistry

how can i Specify what ions are present in solution upon dissolving each of the following substances in water: ZnCl2, HNO3, (NH4)2SO4,Ca(OH)2

asked by nina on October 4, 2009
89. ### Geomtric Series

The midpoints of the sides of a series of a square of side 1 are joined to form a new sqaure. This procedure is repeated for each new square. a) find the sum of the areas all the squares b) find the sum of the perimeters of all the aquares

asked by Janet on March 18, 2009
90. ### chemistry

The element rhenium (Re) has two naturally occurring isotopes, 185Re and 187Re, with an average atomic mass of 186.207 amu. Rhenium is 62.60% 187Re, and the atomic mass of 187Re is 186.956 amu. Calculate the mass of 185Re. am i supposed to multiply the

asked by lyne on January 5, 2009
91. ### Chemistry

At 900 K the following reaction has Kp=0.345; 2 SO2(g) + O2 (g) -> 2 SO3 (g) In an equilibrium mixture the partial pressures of SO2 and O2 are 0.145 atm and 0.455 atm, respectively. What is the equilibrium partial pressure of SO3 in the mixture?

asked by Anonymous on September 7, 2009

how do you write a song that will knock over a cow?

asked by wyatt on April 1, 2009
93. ### PHYSICS!!

An amusement park ride consists of a rotating circular platform 8.26 m in diameter from which 10 kg seats are suspended at the end of 1.14 m massless chains. When the system rotates, the chains make an angle of 16.2 degrees with the vertical. The

asked by bubba on November 16, 2009
94. ### Chemistry

How many moles of ions are released when these samples are dissolved in water? a. 0.37 mol of NH4Cl b. 3.55 * 10^18 formula units of Ba(OH)2 * 8H2O I need to know what steps to take to get to the answer. Thanks!

asked by Nancy on November 2, 2009
95. ### chemistry

Consider a system consisting of a cylinder with a movable piston containing 10^6 gas molecules at 298K at a volume of 1L. Consider the following descriptions of this system: 1. Initial system 2. Starting from the initial system, the volume of the container

asked by CHEMistry on March 16, 2009
96. ### math

Accoring to math teachers, what did the acorn say when it grew up? there is ten questions and 15 boxes

asked by joy on September 8, 2009
97. ### physics

A flock of ducks is trying to migrate south for the winter, but they keep being blown off course by a wind blowing from the west at 6.0m/s. A wise elder duck finally realizes that the solution is to fly at an angle to the wind. If the ducks can fly at

asked by Angela on October 11, 2009
98. ### Physics 221

A 20g particle is moving to the left at 30 m/s. How much net work must be done on the particle to cause it to move to the right at 30 m/s. The answer is 0J of work, and i understand the method of equations, but i don't understand the logic behind it.

asked by K on December 8, 2009
99. ### physics

10. A cannon elevated at an angle of 35º to the horizontal fires a cannonball, which travels the path shown in the diagram below. [Neglect air resistance and assume the ball lands at the same height above the ground from which it was launched.] If the

asked by Physics Student need help on November 12, 2009
100. ### Chemistry

A sample of Oxygen has occupies 1.00x10^6mL at 575mm Hg is subjected to a pressure of 1.25atm. What will the final volume of the sample be if the temperature is held constant v2=(p1)(p2)/p2 I'll have to convert 1.25atm to mm first 1.25atm*760mm/1.0atm =

asked by Chopsticks on March 18, 2009