# Questions Asked onSeptember 18, 2010

1. ## biochemistry

How do you calculate the PH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of 1.0 M sodium lactate?

2. ## math

In a certain town, 25% of people commute to work by bicycle. If a person is selected randomly from the town, what are the odds against selecting someone who commutes by bibycle? A). 3:1 B). 3:4 C). 1:3 D). 4:1

3. ## math

The diameters of ball bearings produced in a manufacturing process can be described using a uniform distribution over the interval 2.5 to 8.5 millimeters. What is the probability that a randomly selected ball bearing has a diameter less than 4.5

4. ## Physics

A wooden boxcar is moving along a straight railroad track at speed v1. A sniper fires a bullet (initial speed v2) at it from a high-powered rifle. The bullet passes though both lengthwise walls of the car, its entrance and exit holes being exactly opposite

5. ## Chemistry

175g of water was heated fro 15 to 88 degrees C. how many kilocalories were absorbed by the water? I got 94.5 kcal. Is this right?

6. ## Chemistry

A volume of 70.0mL of aqueous potassium hydroxide(KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the solution if 19.2mL of 1.50M H2SO4 was needed? The equation is 2KOH+H2SO4->K2SO4+2H20

7. ## math

The tread life of a particular tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2000 miles. What is the probability that a randomly selected tire of this brand will last longer than

8. ## medicine

How many ml of 50% dextrose should be added to 1 L of 0.9% NaCl to make a 5% dextrose solution?

9. ## physics

A car enters the freeway with a speed of 6.5 m/s and accelerates uniformly for 3.5 km in 3.9 min. How fast is the car moving after this time? Answer in units of m/s.

10. ## Chemistry

When a chemical cold pack is activated, a chemical reaction occurs that causes the pack to feel cold. - Describe the transfer of energy betwen a cold pack and the air around it.

11. ## Organizational Behavior

Questions 1. Research conducted by Luthans supports the belief that promotions are base on performance. True or false 2. Tenure is negatively related to turnover. True or False. 3. Age and avoidable absences are negatively related. True or False. 4. Which

12. ## Chemistry

A mixture contains only NaCl and Al2(SO4)3. A 1.45-g sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.107 g.

13. ## math

A class consist of 2/5 freshman,1/4 sophomores, and 1/10 juniors; the rest are seniors. What fraction of class are seniors?

14. ## math

In each of the following, order the decimals from greatest to least: a) 13.4919, 13.492, 13.49183, 13.49199 b) -1.453, -1.45, -1.4053, -1.493

15. ## math

the width of a rectangle is fixed at 4cm. Determine in terms of an inequality those lengths for which the area will be less than 92cm^2 the length must be less than ? cm the solution is {L|L< ? cm

16. ## Chemistry

Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, , can be titrated against a solution of potassium permanganate, . The following equation represents the reaction:

17. ## GPA?

Would taking extra classes online help raise my GPA to a 2.8?? (I'm a junior and i need it raised before the end of my senior year. I have a 1.27 Grade Point Average right now.)

18. ## Psychology

Can you think of any examples of how interactions with a partner or spouse may have been influenced by what you learned by observing other family members or even television? I know one example might be seeing your parents argue when you were a child. But I

19. ## College Chemistry

a)What is the theoretical yield for this reaction under the given conditions? b)What is the percent yield for this reaction under the given conditions? 1.41gH2 is allowed to react with 10.4gN2,producing 2.46gNH3

20. ## math

the signs of the first and second coordinate are always the same in quadrants . Type I ,II,III, or IV. Use a comma to separate answers as needed.

21. ## Physics

A girl notices a ball moving straight upward just outside her window. The ball is visible for 0.25 seconds as it moves a distance of 1.05m from the bottom to the top of the window. How long does it take before the ball reappears? What is the greatest

37. ## chemistry

How do you calculate the number of grams of solute in 0.250 L of 0.175 M \rm KBr?

38. ## Physics

Three Coulombs of charge flow through a wire in 150 ms. If the current ceases to flow (goes to zero Amps) for the following 850 ms, what is the average current over this one-second period?

39. ## algebra

The sales representative informs you that there are 56 homes for sale with two floor plans still available, Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation.

40. ## physics

the mean radius of the earth is 6,000,000 meters. Express this value in kilometers

41. ## physics

An object is shot from the back of a truck moving at 40 km/h on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the truck. If air resistance is neglected, the object will fall: a. depends on the value of g b. in front

42. ## geography

what is this word unscrambled aemampltfeosne

43. ## Chemistry

I have test procedure to evaluate the clarity of a sodium hydroxide (NaOH) sample that goes like this: Dissolve 10g of NaOH in carbon dioxide free water and dilute to 100ml with the same solvent. Please explain how to perform this test. Do I boil 100ml of

44. ## math

Assume that the weight loss for the first two months of a diet program has a uniform distribution over the interval 6 to 12 pounds. Find the probability that a person on this diet loses between 9 and 12 pounds in the first two months. a. 1/4 b. 1/2 c. 1/3

45. ## Math

How many ml of 50% dextrose should be added to 1 L of 0.9% NaCl to make a 5% dextrose solution?

46. ## Science

What weather would it be when: 1. A thunderstorm is developing spinning winds at it's center 2. A low-pressure center is over the Atlantic Ocean where the water temperature is above 27°C 3. Cold air is pushing warm air where the air is 2°C and the ground

47. ## physics

rewriting this, since it was typed wrong. In reaching her destination, a backpacker walks with an average velocity of 1.34 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.68 m/s, due west, turns

48. ## english

From Texas comes the Star Ruby grapefruit. woule the subject be Texas?

49. ## chem h/w

i did a lab and i need to find out the melting point for lauric acid and lauric acid with another substance. the teacher told us to figure it out using excel. this is my graph. tinypic. com/view.php?pic=1605yev&s=7 can someone help me in figuring out the

50. ## english

definition of the word " instillation" and using this word can someone please make a sentence??..

52. ## College Physics

A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk?

53. ## physics

Highway safety engineers build soft barriers so that cars hitting them will slow down at a safe rate. A person wearing a seat belt can withstand an acceleration of -300 m/s². How think should barriers be to safely stop a car that hits a barrier at 110

54. ## Algebra 2

Perimeter of Triangle: the length of the sides of a triangle are 1/x, 2/x, and 2/3x meters. Find a rational expression for the perimeter of the triangle

55. ## spanish

Hello, I am in spanish 2, and we are studing indirect/direct object pronouns and preterite tense. We were supposed to write a paragraph on what we did this weekend. I was wondering if someone could look over my paragraph and see if there are any errors.

56. ## Physics

What is the period of the minute hand of a clock?

57. ## social studies

How did buddism spread through Asia?

58. ## Art

So I'm trying to answer Leonardo da Vinci's statement on perspective. And the question is: How does our mnemonics trick FOPS (Fading, Overlapping, Placement, Size) Corroborate (confirm) the following statement by the great Renaissance Master Leonardo da

59. ## algebra

2/5x+1/3=3 2/15

60. ## algebra2

1. solve: 5+4x-2x^2=0 2. find k so that the like kx-3y=4k is a. parallel to like 2x-4y=1 - for this i got y=1/2x-1/4... is that right? b. perpendicular to line x-6y=2

61. ## french

is this right: black in french is 'noir' for masculin form and for feminin form it is 'noires' please correct me

62. ## Chemistry

What minimum frequency of light is required to ionize potassium?The energy required to ionize potassium is 419kJ/mol?

63. ## math

the front of a regulations goal for a professional sport is 7ft wide and 3ft high, find its area

64. ## math

20x=4y+9 find the slope

65. ## English

Is the book new shoes for sylvia authentic if so why?

66. ## Algebra 2

Is it possible to solve |2x| + 3 =x? I got x= -3, but it doesn't seem to work when you plug it into the original equation to check it..

67. ## english

definition of the word 'illustrious' and a sentence using the word

68. ## chemistry

why is the ionisation energy of oxgen less than that of nitrogen even if oxygen is to the right hand side of nitrogen?

69. ## chemistry

for an oxygen atom,wich requires more energy,tha addition of two electron or the removal of one electron?explain why

70. ## math

write in standard form using numbers - Two thousand twelve ten-thousandths?

71. ## math

how do you write twenty-two millionths? (in standard form using numbers)

72. ## math

7p-8q=3 determine whether (1,-3) is a solution

73. ## Chemistry

How many calories are required at 0 degrees C to melt an ice cube with a mass of 25g? I got 2000 cal. Could you tell me if this is right?

74. ## Astronomy

If the sidereal period of the moon was 29.0 days(instead of the 27.32 days) what would be its synodic period? HINT: consider how far around the sun the Earth/Moon will have travelled in 29.0 days

75. ## math

56x^3y^5-40x^2y^6+8x^2y^3

76. ## Chemistry

An object made of aluminum has a mass of 8.37g. When it was placed in a graduated cylinder containing 20.0mL, the water level rose to 23.1mL. Calculate the density and the specific gravity of the object. For the density I got 2.7g/mL, and for specific

77. ## math

2x^4y^2+4x^3y^3+2x^2y^4

78. ## math

a^2b^2-2a^2b-15a^2

6x^2+21x-45

6x^2+21x-45

3x^-x-2=0

82. ## Algebra 2

What two equations can you write from |y+3|+5=2y? I know one is y+3=2y-5, which becomes 8. Is there another equation possible?

83. ## PHY

Is that true the net force on the exit sign is 25N

84. ## Physcis

An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b.

85. ## Physics

Three Coulombs of charge flow through a wire in 150 ms. If the current ceases to flow (goes to zero Amps) for the following 850 ms, what is the average current over this one-second period?

86. ## Physics

a)Why is it more important for an aircraft pilot to know the wind velocity than the wind speed? b)Why is it more important for all pilots to use the same conventions when describing velocity?

87. ## English III

who are the two bidding on the monkey music box in the phantom of the oprea?

88. ## college

hello! i need help with homework sociology 1) Which of the following research errors is less prone to being classified as fraud and more likely to be considered as simply sloppy work? A) asking biased questions B) choosing a biased sample c)analyzing the

89. ## Math

The exterior angles of a triangle measure x°, (2x)°, and (3x)°. What is the value of x?

90. ## math

At what time should each boat start so all the boarts will cross the finish line at 100 meters at the same time?

91. ## MATH

from a base elevation of 8600ft a mountain peak in Colorado rises to a summit elevation of 14660ft over a horizontal distance of 15838ft find the grade of the peak

92. ## phy

is that true a block on a flat surface. The normal force on the block and weight of the block make up a third law pair.

93. ## physics

A cheetah runs a distance of 102 m at a speed of 27 m/s and then runs another 102 m in the same direction at a speed of 34 m/s. What is the cheetah's average speed?

94. ## physics

how do you divide 1.49457 x 10^11 by 3.00 x 10^8? thanks for the help

95. ## math

what is the avarage of:89,84,63,79

96. ## physics

Here's a physics problem. I don't care about the answer, i just want to know how to do it. don't have to be too detailed.. but i don't really kno how to start this 1.) A model rocket blasts off from the ground rising straight upward with a constant

97. ## algebra

2y^-3 = 4e^(-x/2)/(1+e(-x/2)) my teacher gave this problem in my chem class and i don't know what he is really asking , does any one have an idea if i have to solve for y or what's going on..

98. ## math

from a base elevation of 8600ft a mountain peak in Colorado rises to a summit elevation of 14660ft over a horizontal distance of 15838ft find the grade of the peak . the grade of the peak is ? %

99. ## pre-cal

Solve (x+2)/(x+1) -2 < 0 I know the LCD is x + 1. (x+2-2x-2)/(x+1) < 0 (-x )/(x+1) < 0 But somehow, I got the wrong answer. The answer is (4, 7]. But I don't know where I went wrong.

100. ## parenting

what does this quote mean ''there comes a time when a woman needs to dtop thinking about her looks and focus her energies on raising her children. this time comes at the moment of conception. A child needs a role model, not a supermodel'' by astrid alauda

133. ## math

Explain an error problem in each of the following: a) 13/35=1/5, 27/73 = 2/3, 16/64 = 1/4 b) 4/5+2/3=6/8, 2/5+3/4=5/9, 7/8+1/3=8/11 c) 8 3/8-6 1/4=2 2/4, 5 3/8-2 2/3=3 1/5, 2 2/7-1 1/3=11/4 d) 2/3*3=6/9, 1/4*6=6/24, 4/5*2=8/10

134. ## math help

4(x+5)=3(x-4)+x

135. ## 7th math

how to do 345x 7.899=

136. ## algebra

Help, Can anyone show me how to do the formula to solve these equations? 4x-5y=38 7x-8y=-22 If you can show me the right way to solve, I do not understand how to get the answer.

137. ## Chemistry -help

To determine the sodium carbonate content & total alkali in NaOH, the following steps were performed:- 1) 2.0g of NaOH was dissolved in 80ml of CO2 free water. 2) 3 drops of phenolphthalein indicator were added and the solution was titrated with 1M HCl.

138. ## Biology

In what ways are plasma membranes, cell walls, capsules, and sheaths only the outer limits of a cell and not the cell"s boundaries?

139. ## physics

Here's a physics problem. I don't care about the answer, i just want to know how to do it. don't have to be too detailed.. but i don't really kno how to start this 1.) A model rocket blasts off from the ground rising straight upward with a constant

140. ## Aed 204

Assignment: Creating an At-Risk Program Resources: Ch. 8 of Multicultural Education and Appendix E. Imagine that you have been asked to serve on the advisory board for a new, alternative school program in your school district. The advisory board must

141. ## Biology

In what ways are plasma membranes, cell walls, capsules, and sheaths only the outer limits of a cell and not the cell"s boundaries?

142. ## Biology

In what ways are plasma membranes, cell walls, capsules, and sheaths only the outer limits of a cell and not the cell"s boundaries?

143. ## math-repost

Data regarding the value of a particular color copier is representing in the graph. Find the rate of change of the value with respect to time, in dollars per year. The line goes from 8 vertical to 10 horizontal. The points on the graph are on the value 4

144. ## Biology

Are dicots divided into woody and herbaceous stems?

145. ## math

In a triangle ABC,angle B is 3 times angle A and angle C is 5 degrees less than 6 times angle A. Find the size of the angles.

146. ## phy

Determine the radial acceleration of the car at this time. If the curve were flat, what would the coefficient of static friction have to be between the tires and the roadbed to provide this acceleration with no slipping or skidding?

147. ## Calculus

Our professor wants us to evaluate the limits analytically without using a table or a graph, and if it doesn't exist we must describe the behavor near the limit point. I'm not sure how to evaluate each side of a limit separately without looking at a table

148. ## calculus

A Norman window has the shape of a rectangle surmounted by a semicircle as in the figure below. If the perimeter of the window is 37 ft, express the area, A, as a function of the width, x, of the window. How do you do this problem?

149. ## economics

Are there times when one’s use of the police force diminishes the use for others? If so, can it be defined as a public good?

150. ## Biology

Populations are frequently NOT in equilibrium due to selection or other evolutionary forces. Imagine a population of 100 individuals. Forty-nine of the individuals are homozygous dominant for beady-eye gene, 9 are heterozygous and 42 are homozygous

151. ## history

i have to write a double spaced one page essay on the battle of passchendaele, but i don't know anything about it. help please?

152. ## algebra

help I don't understand the recursive formula

153. ## social studies

I need help with my abc book on california HELP ME!

154. ## math

determine whether (3,7) is a solution of 6p-6q=-2

155. ## U.S. Government

I don't get how the Homeland Security Advisory System is STILL at the "Elevated" level. There could be a significant risk of terrorist attacks in the future?

156. ## algebra

save a 100 a month for 30 yrs at 3% interest compounded monthly how much do you have at the end of 30 years what are the steps to solve this problem

1/3 x 1/3 ?

158. ## math

solve each equation 3/8+b/3=5/12

159. ## visual

Choose three (3) works of art from three artists from the Baroque period through the Postmodern era. Your three (3) works of art should come from the time periods or art movements covered in the reading from Unit 4 and Unit 5. Your choices must comply with

160. ## history

I have to do a research aper on any topic in American history. One part of history that I enjoy studying is when new inventions came around or when things become more modern (think housewife using vacuum type scenario if you get what I mean) or like when

161. ## Algebra 2

Is the solution to 0 ≤ |4u - 7| u ≥ 7/4?

162. ## Science

A passenger in a moving train drops an apple. Describe how a man standing by the train tracks sees the apple falling when he looks through the window.

163. ## chemistry

If you mixed equal volume of .1 M HCl and .20 M Tris (pka=8.3), IS THE RESULTING SOLUTION A BUFFER SOLUTION? Why? or Why not?

164. ## Physics

When the dried-up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 2.64 m/s at an angle of 30.0˚ below the horizontal. The seed pod is 0.465 m above the ground. How long does it take for the seed to land? What

165. ## calculus

x = 6 h(x) = (x-1/2 + 5x)(1 - x-1)

166. ## Math

value of \$25000.00 compounded semi annually at 7% for 5 years

167. ## parenting

what does the following parenting quotes mean; when you have brought up kids, there are memories you store directly in your tear ducts by robert brault your children need your prescence more than your presents by jesse jackson to bring up a child in the

Why? Write a 200- to 300-word response to the following questions based on “Superhero in the Cubicle” in the Electronic Reserve Readings: o What technological advancements in communication were discussed in the article? o Choose two communication types

169. ## English

Can you please tell me if the following description of a classroom is correct? 1) My classroom is on the ground floor, just opposite the teacher's room. 2) It is very large and full of light (sunny??) since it has got two big windows overlooking the

170. ## english

Last night Dad prepared spaghetti and a salad for supper. ? is prepared spaghetti and salad for supper the predicate?

171. ## math

Find the total weight of the boxes of pecans in a shipment of 3 lb boxes of pecans and 2 lb boxes of walnuts. 1)there were 24 fewer 2 lb boxes of walnuts than 3 lb boxes of pecans. 2)The total weight of the shipment was 462 lb. How do I set this up in a

172. ## English

In the United States, people enjoy a wide varietypf food. ? would the predicate be In the United State enjoy a wide variety of food?

173. ## geometry

1£©sketch six points a b c d e and f, no three of which are collinear. name the lines defined by these points. how many lines are there¡£¡£ 2£©describe a way to find points that divide a segment into fourths¡£ 3£©a classmate tells you " finding

174. ## chemistry

how would one do this problem.. 2y^-3 = 4e^(-x/2)/(1+e(-x/2))

175. ## Physics/math

A deep mountain valley is separated by two vertical cliffs. One cliff is 600 meters high and the other is 400 meters high. A cable car runs from the foot of each cliff to the top of the other cliff. At what height above the ground do the two cable cars

176. ## CALCULUS

Use the product rule to calculate the derivative. dh dx x = 4 , h (x) = (x^(-1/2) + 7x)(9 - x^-1) very weird.. i know how to do it, i used product rule and got an answer in decimal but the website is not accepting it. Can any one help me?...

177. ## Chemistry

Draw Bohr diagrams of the following: A) O and O2- I know how to draw the regular O bohr diagram. 2 electrons in the first shell, and 6 in the outer one, but I don't get how to draw a 02- diagram. Do I just take away 2 electrons from the outer shell?

178. ## English

Tomorrow Erica will make German potato salad. Would the predicate be Tomorrow will make German potato salad?

179. ## phy

A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 340 km/h in a semicircular arc with a radius of 196 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant

180. ## maths

What is 174.36 rounded up to nearest tenth

181. ## math

Can someone help me please? I have 4 equations that need to be matched up to different graphs. I need to know how to work the equations so I can match them to the graphs. 6y>15-3x 5x-3=2y -x y+x

182. ## algebra

5square root 27 plus 7 square root 3

183. ## Finance

I need to write an essay on if I think producing more money will help or hurt my local economy. The essay needs to clearly state the reasons behind my theory on how much money I should produce for my economy. It also needs to have one internet site that

184. ## English

Sometimes Mom makes chow mein. Would the predicate be sometimes makes chow mein?

185. ## Physics

A shell is launched at 140 m/s 56.0 degrees above the horizontal. When it has reached its highest point, it launches a projectile at a velocity of 110 m/s 35.0 degrees above the horizontal relative to the shell. 1) Find the maximum height (in m) about the

186. ## shiloh

a rock on earth has a mass of 250kg.what is its mass and weight on the moon?

187. ## CALC BC

How do I find the derivative of x^ (1/(x-1)) is it (1/(x-1)) x^[1-(1/(x-1))] * (-1/ (x-1)^2) ?? If not, can you please write out what rule I should use? Thank you very much!

188. ## math

how to find the x and y intercept of cubic functions

189. ## Chemistry

Consider a 1.50-g mixture of magnesium nitrate and magnesium chloride. After dissolving this mixture in water, 0.500M of silver nitrate is added dropwise until precipitate formation is complete. The mass of the white precipitate formed is 0.641 g.

190. ## Chemistry

How does a compound's properties compare to those of its component elements? Provide an example. I don't get this q.

191. ## Science

Imagine that a group of factories and power plants lies 200 kilometers to the west of a forest where the trees are dying. Describe three steps in a process that could be causing the trees to die.

192. ## Physics

A 48V battery delivers power to a golf cart. The golf cart drives for 45 seconds while the batteries deliver 12A of current. How much energy (in Joules) is delivered during the drive?

193. ## physics

Here's a physics problem. I don't care about the answer, i just want to know how to do it. don't have to be too detailed.. but i don't really kno how to start this 1.) A model rocket blasts off from the ground rising straight upward with a constant

194. ## philosphy

Cathy owes six overdue movies to her local video store. Since each of Cathy’s overdue videos is a comedy, only comedies are currently overdue at Cathy’s local video store. Which one of the following premises, if added to the statements above, would

195. ## english

Beyond those distant mountains lies an ancient American Indian village. would the subject be ancient American Indian Village?

196. ## math

A roulette wheel has 18 red slots and 18 black slots numbered alternaetly with the numbers 1 through 36. Two green slots are numbered 0 and 00. The winning number is determined by the slot into which a single marble rolls. Players are not allowed to bet on

197. ## english

In Florida, citrus trees grow an important crop. would the subject be Florida?

198. ## Calculus

Is there a number "a" such that the limit as x approaches -2, f(x) approaches (3x^2+ax+a+3)/(x^2+x-2) exist?

199. ## college

I need to site from two essay one is the Famine,affluence,and morality(pete singer) and the other is Garrett hardin the Lifeboat. I have read both essay.Now I need to cite from them and put in apa format can some please help me

200. ## college-history

What parallels, or differences, can you identify between Athenian expansionism in the age of the Peloponnesian War and the contemporary career of the American republic?

201. ## phy

is that true faster objects have a greater acceleration than slower objects?

202. ## Chemistry

Which intermolecular forces between the war and protein are affected by the addtion of strong acids and bases?

203. ## geometry

What does angle QPT = 120degrees 48minutes and 30 seconds mean?

204. ## Science

What weather would it be when: A. a cold front is moving into an area that has warm, moist air. B. A warm front is moving into an area that has cold, dense air. C. A cool sea breeze is blowing inland, causing warm, humid air to rise. D. Air pressure is

205. ## english

After three to five years, fruit grows on the new trees. would the subject be grows on the new trees?