# Questions Asked onSeptember 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?

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

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

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

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

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...

7. ## niagra falls geography

what are the physical& human features of the Niagra falls

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?

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

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?

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?

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

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?

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.

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

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

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?

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

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?

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

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

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.

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?

24. ## MATH 157

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

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

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

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.

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?

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!

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?

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

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

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

34. ## algebra

how to factor 8x^3+27?

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

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?

37. ## math

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

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.

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

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

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

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?

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

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

45. ## writing messages

informative,negative,positive messages

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

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

48. ## Government

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

49. ## math

lcm of 150,36,245 =44100 ?

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

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?

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

53. ## social studies

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

54. ## writing

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

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

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

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.

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.

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

60. ## physics

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

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)

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

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?

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?

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

66. ## Criminal Justice

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

67. ## algebra

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

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

69. ## english

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

70. ## College Algebra

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

71. ## spanish

who wrote don quijote?

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

73. ## ap chemistry

give an example of an organic compund made from inorganic substances

74. ## math

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

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.

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

77. ## chemistry.

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

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?

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

80. ## Math thanks, Reiny

Thanks Reiny!

81. ## science

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

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?

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

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

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

86. ## social studies

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

87. ## world history

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

88. ## Physics

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

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

90. ## Math

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

91. ## Science

What is the Newtons Laws

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

93. ## gr.10 math!

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

94. ## religion

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

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

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

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

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)·( + ).

99. ## science

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

100. ## hygiene

what is the ideal temperature for a freezer

101. ## health care

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

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

103. ## algerbra

what is 3x+45=62?

104. ## Geography

How does Geography impact the lives of people?

105. ## scince

what does the cross in the warning signs mean?

106. ## science

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

what do geographers want to know about peoples movement?

108. ## religion

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

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

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

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?

113. ## Math

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

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?

Multiply 13*(-7)

116. ## Microeconomics

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

117. ## Economics

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

118. ## Microeconomics

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

119. ## Microeconomics

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

120. ## History

Which amendment banned discrimination between genders?

121. ## Algebra

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

122. ## psychology/english

what would you say is the definition of biological psychology?

123. ## geography

tips on how las vegas can conserve water?

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?