# Questions Asked onJune 8, 2010

1. ## Physics

A ventilation fan has blades 0.25 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade?

2. ## Chem (HELP ASAP)

Phenol C6H5OH partially dissociates in water as shown C6H5OH + H2O --> H3O+ + C6H5O- If Ka is 1.6*10^-10 and the concentration of H3O and C6H5O are both 1.0*10^-5 M at equilibrium, what would be the concentration of phenol?

3. ## Physics

A woman who weighs 500N stands on an 8.0-m-long board that weighs 100N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing?

4. ## Economics

1) Which of the following is an example of a measure of labor productivity? a. Autos get 30 gallons to the mile. b. The growth rate of per capita real GDP is 3.5 percent per year. c. Farm workers produce 30 bushels of wheat per worker per day. d. Wages

5. ## Physics

A Ferris wheel, rotating initially at an angular speed of 0.500 rad/s, accelerates over a 7.00-s interval at a rate of 0.04 rad/s^2. What angular displacement does the Ferris wheel undergo in this 7-s interval?

6. ## Physics

A 3.0-m rod is pivoted about its left end. A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2m from the pivot causing a CCW torque, and a force of 5.2N is applied at the end of the rod 3.0m from the pivot. the 5.2N is at an angle of

7. ## poisson distribution math

Mr Lee is planning to go fishing this weekend. Assuming that the number of fish caught per hour follows a Poisson distribution with mean 0.6, find the number of complete hours that Mr Lee needs to fish so that the probability of catching more than two fish

8. ## algebra

What number is used to complete the square for the equation x^2 + 5x = 0? a) 6.25 b) 25 c) 10 d) 2.5 a

9. ## Physics

What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?

10. ## Algebra

On a standardized test, the distribution of scores is normal, the mean of the scores is 75, and the standard deviation is 5.8. If a student scored 83, the student's score ranks 1. below the 75th percentile 2. above the 97th percentile 3. between the 75th

11. ## Physics

Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?

12. ## geometry

An isosceles trapezoid has bases of 4 and 10. If the base angle is 45°, find the area.

13. ## Stereotypes-workplace

can u please give me websites that talks about: the stereotypes in workplace on: "women works better with men than women" because that way there is less fight and competition. or Stereotypes on GENDER in workplace I've been trying to find as much as i can

14. ## math

In a school 1/5 th of the girls and 1/8 th of boys took part in a school camp. Find friction of the total strength of took part in the camp

15. ## Anatomy

another name and cause of hyperthyroidism

16. ## entropy change (chem)

determine the entropy change for the displacement reaction represented by the following equation : Cl2 + PbBr2 -> PbCl2 + Br2 Cl2 = 223.066 delta S PbBr2 = 182.7 delta S PbCl2 = 131.3 delta S Br2 = 152.231 delta S

17. ## Chemistry

10.0 mol of ammonia gas is injected into a 4.0 L container. At equilibrium 1.2 mol of nitrogen gas is found in the container. The number of moles of ammonia gas left in the container must be which of the following? N2(g) + 3H2(g) 2NH3(g) + 94 kJ a. 8.8 d.

18. ## Chemistry

give the balanced equation for: Liquid nitric acid decomposes to reddish brown nitrogen dioxide gas, liquid water, and oxygen gas. the equation i got was HNO3 --> NO2+ H2O+ O2 is that right? i haven't balanced it yet

19. ## algebra

3x=17 the anser is 5.6. whats that in fraction form?

20. ## physics

the force exerted on a rope pulling a wagon is 49 N. the rope is 35 degrees above the horizontal. find the force that pulls the wagon over the ground.

21. ## College Physics

A point on a rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s^2. What is the angular speed of a point 0.075 m from the center of the disk?

22. ## O-Chem 253

I hydrolized the following compound: cis-norbornene-5,6-endo-dicarboxylic anhydride then took the cis-norborene-5,6-endo-dicarboxylic acid and added H2SO4 to it (warmed it up and cooled it) then added drop by drop water (then I reheated the mixture and

The deltaS for a reaction is 3.0 J/(mol*K) at 25 degrees C. Caluculate the deltaG for the reaction when DeltaH = -394 kL and determine whether it will occur spontaneously at this temperature

24. ## physics

A 2.10-g particle is released from rest at point A on the inside of a smooth hemispherical bowl of radius R = 28.0 cm. Calculate the following: (a) Its gravitational potential energy at A relative to J (b) Its kinetic energy at B. J (c) Its speed at B. m/s

25. ## Math

Find the x-intercepts of the following equation. List the x coordinate only. Y=x^2+2x-3

26. ## Chemistry

I will try these again, as I am really struggling with these compounds. Hard going back to school after all these years. 1. I will list the longest chain and then tell when items are placed above and below CH3-C=CH-CH-CH3 above C is CH3 Below the second CH

27. ## geometry

find the radius of the circle inscribed in a triangle whose sides are 15cm, 17 cm and 8cm?

28. ## algebra

which quadratic formula would be used to solve the following quadratic equation? 4x^2 - 5x = -2 can you show me the correct answer and how do it please

29. ## algebra

solve 2x^2 = 9x. round to the nearest tenth. a)x = 0 or x = -4.5 b)x = 4.5 c)x = 1.5 or x = 3 d)x = 0 or x = 4.5 i think the answer is d but i could be wrong

30. ## Chemistry

consider 2 sample of nitrogen gas. sample 1 contains 1.5 mol of N2 and has a volume of 36.7L at 25C and 1 atm. sample 2 has a volume of 16.5L at 25C and 1 atm. calculate the number of moles of N2 in sample 2 do i use the pv= nrt equation? and do i only use

31. ## History 125

Create a five to seven-point bullet point list of the factors that led to political stalemate and the subsequent farmer's revolt in the late 19th century

32. ## Chemistry

Help with the equation for the synthesis 2-chlorobutane from 1-butene and hydrogen chloride for bromobenzene from benzene and bromine I came up with 1C6H6+1Br2->1C5H6Br+1HBr is this correct?

33. ## algebra

simplify the following radical expression: 3 sqrt () -216x^2/x^2 a) sqrt() -6x b)-6 c)-6 sqrt()x d) 6 sqrt()-x

34. ## college physics

The flywheel of a steam engine runs with a constant angular speed of 165 rev/min. When steam is shut off , the friction of the bearings and of the air brings the wheel to rest in 2.30 hrs (a) What is the constant angular acceleration of the wheel, in

35. ## physics

A 5 m long see saw has a child whose mass is 25 kg sitting on one end. How far in meters from the center should a 70 kg adult sit on the opposite side for the see saw to balance?

36. ## algebra

Simplify: sqrt() 27 - sqrt() 8 + 2 sqrt() 2 a) 0 b) 3 sqrt () - 2 sqrt() 2 c) 3 sqrt () - 4 sqrt () 2 d) 3 sqrt () 3

37. ## chem - precipitation problems

When hydroge sulfide gas is passed through a solution of lead (II) nitrate, lead (II) sulfide precipitates out. Write a balanced equation for this reaction and calculate an average rate, in mol/s for the reaction from this data: 1) at 0 seconds, mass of

38. ## help with molar mass in CHEMISTRY

200 g of a non-electrolye is dissolved in 1000 g of water. The boiling point of the solution is then measured to be 101.5 C. What is the molar mass? (the Kb for water is 0.51 C/m) I know deltaT = 0.51 C/m but where do I go from there?

39. ## Math

Solve: x^2+7=43

40. ## science

what six conditions can affect the rate of chemical reactions?

x^2+7=43

42. ## Math

Solve by completing the square: x^2=5x+2

43. ## Math

Solve by using the quadratic formula: x^2=5x+2

x^2+16x+69=6

45. ## Biology

Which phyla have the different types of body symmetry that animals have?

46. ## Algebra 1

Hello. Can someone show me how to 'multiply and express the product in simplest form.' If I can get a detailed example for the first one, I could go my own way for the other two. 1. x - 3 (_______)^3 . 1 2 (______)^2 x - 3 2. x^2 - 9 _______ . x^2 - 4 x +

47. ## Physics

Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!

48. ## Chemistry

write a balanced equation for solid ammonium nitrite is heated, it produces nitrogen gas and water vapor. i haven't balanced it yet, but is this equation right? NH4NO2 ---> N + H2O

49. ## math

Find the vertex of the parabola. y=x^2-6x+7

50. ## Algebra

Find the axis of symmetry. x^2-9x+3

if a rectangular prism has a vloume of 36 cubic centimeters list 4 possible dimensions it could have

52. ## math

what is the height of a triangle whose sides are 13 , 20 and 21 cm

53. ## Math

Are all linear equations functions? Why or why not?

54. ## Geometry HELP

A line passes through points (x, 7) and (3, 2). The slope of the line is 1/2. Find x. a.)5 b.)13 c.)3.5

55. ## Maths

I got this question, and found what I believe to be the solution, but want it confirmed. I started with: log[base5](2x+1) + log[base5](x-1) = 1 And used the product law: log[base5]((2x+1)(x-1)) = 1 log[base5](2x^2-x-1) = 1 Then I changed to exponential

56. ## Math

The height h in feet of an object after t seconds is given by the function. h=-16t^2+40t+9

57. ## Biology

I need help with a few questions involving my study guide for my exam.. some things are old so i need help to remember them. Do all cells reproduce the same way? Why/How does DNA decide everything? What enzymes are involved in replication? please help me

58. ## CHM 152

How many gram of Fe+3 are required to make 1.0 L of an aqueous solution of 10 ppm Fe+3? Assume density of water is 1.00 g/mL.

59. ## CHM 152

An automobile antifreeze contains equal volumes of ethylene glycol (d=1.114 g/mL and FW = 62.07) and water (d=1.00 g/mL) at 25oC. The solution has a density of 1.06 g/mL. What is the molarity of ethylene glycol in the solution?

multiply. assume that expressions under radicals are non negative. √x+3 * √x-3

Find the equation of a line that passes through the point (1,2) and has a slope of 1/3. Show how you found the equation. Would the equation be: y-2=1/3(x-1) Do I need to finish this? I am not sure how.

62. ## Math

Canyu canoe co rents canoes for 8 dollars plus 3 dollars per hour or any part of an hour. for how many hours can you rent a canoe if you want to spend no more then 25 dollars?

63. ## Chemistry

200 g of a non-electrolye is dissolved in 1000 g of water. The boiling point of the solution is then measured to be 101.5 C. What is the molar mass? (the Kb for water is 0.51 C/m) I know deltaT = 0.51 C/m but where do I go from there?

65. ## Geometry HELP

Find the slope of the line that contains points (3, 2) and (-3, 6). a.)3/2 b.)Undefined c.)-2/3

111. ## math

Quadrilateral PQRS is a parallelogram. If adjacent angles are congruent, which statement must be true? A. PQRS is a square. B. PQRS is a rectangle. C. PQRS is an isosceles trapezoid. D. PQRS is a rhombus

112. ## wgu

How did the moon landing help to change the way scientists understand an aspect of the natural world.

113. ## Physics

a runner moving at a speed of 5.60 m/s rounds a curved track with a 60.0 m radius. what is the runners acceleration?

114. ## more physics..

find the kinetic energy of an airplane traveling at a speed of 648 km/h if the mass of the airplane is 5,000 kg.

115. ## chemistry

Would the reaction of NaOH and HCl be arrhenius, bronsted-lowry, or lewis? What about NaOH and H2SO4?

116. ## Sci

What's the point of having a ecosystem diagram for the global warming?????? And I do then whats my hypothesis going to be??? Also then what is going to be my reason and concern on why I have sataed to have coosen this type of science project for the

117. ## CHM 152

A 0.750 L bottle of a French Merlot is said to contain 12.5% alcohol by volume. How much of the liquid, in mL, in the bottle is water?

118. ## Grammar

Identify the function of the relative pronoun in the adjective clause. The game was designed by Zack, who studies computer programming...

119. ## Grammar2

Identify the function of the relative pronoun in the adjective clause. We all enjoyed the play that you wrote. Thomas Edison, whose accomplishments are legendary, will be our focus next week. On the Internet, we researched our ancestors about whom we know

120. ## Physics

A projectile is launched horizontally with a speed of 80.0 m/s. If the projectile is launched 1.5m above the floor, how long does it take the projectile to hit the floor?

121. ## algebra please check :(

find the midpoint of the line segment having the given endpoints(0,5) and (0, -8). (0+0/2, -8+5/2) = (0/2,-3/2)= (0,-1.5) P = (0, -1.5)

122. ## homework help

how much power is developed by an electric motor that moved a 500N load a distance of 20 meters in 10 seconds?

123. ## math pre-ALG

how to write 72,700 in word form

124. ## Punnet Squares

Could some science teacher please have a moment to look at my punnet squares post, I really do need help on it. I will appreciate all the help you could give me, thanks a lot:-)

okay, heres the deal tomorrows my english exam in which i need to write a DESCRIPTIVE paragraph. i reaaaallllllly need a BROAD topic to write about, anyone got any ideas?

126. ## chem 121

if an electrically atom can be shown to posses 16 electronswhat is its atomic number and what is the element

127. ## Chemistry

Calculate the mass defect and the binding energy/nucleon of the nuclide 9/4 Be, which has a mass of 9.01218224 amu. The mass of the proton is 1.00726747 amu and the mass of the neutron is 1.00866490 amu. I've gotten this far... mass of proton + mass of

128. ## Algebra: did I do this right

find the other endpoint of a line segment with the given midpoint (6,4) endpoint ((3, 5). 6= 3/2 and 4 = 5/2 12=6 and 8 = 10 12-6 and 8 - (-10) End Point = (6, 18)

129. ## statistics

Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggest you make a drawing and label first… a.Percentage of scores less than

130. ## Alg

6m/2m would this equal 4m or 3m

131. ## statistics

that last post, the last number is 120

132. ## child growth and development

Dr.Smartz has been intensely engaged in a study of the twins Annette and Brad for the last two years. You would most accurately sayb that Dr.Smatz is engaged in a/an? A. gender experiment B. correlational study C. cross-lagged method D. case study

133. ## algebra

sqrt() x + 7 = 2sqrt()x a) {3/7} b) {0} c) {7/3} d) 0

x^2-7+10=y

135. ## biology

what's an example of competition between humans and other species?

136. ## trigonometry

A construction worker working at 300 feet from the ground, drops a nail onto the ground below. The function, s(t) = -4.9t2 + 300, gives the height (in meters) of the object as it falls to the ground. The velocity at time t = 3 seconds is given by lim(t->3)

137. ## child growth and develpoment

If there is concern about a neural tube defect in the fetus, which of the test is leat usable? A. ultrasound B. Blood test C. AFP assay D. Fetoscopy exam I think it is c

138. ## COM 220

strategies to help a writer spot his or her own errors.

139. ## trigonometry

A construction worker working at 300 feet from the ground, drops a nail onto the ground below. The function, s(t) = -4.9t2 + 300, gives the height (in meters) of the object as it falls to the ground. The velocity at time t = 3 seconds is given by lim(t->3)

140. ## child growth and development

In comparison to concordance rates for autism in dizygotic twins, monozygotic twins are___likely to developthe same illness?A. significantly B. somewhat less C.significantly more D. somewhat more I think it is c

141. ## Operations management

how does finance marketing and personnel support product stategy in an organization

142. ## COM 220

o What was your experience with the Center for Writing Excellence in the past? In addition to the College for Writing Excellence, what other writing tools are available for revising a research paper? · How can you become your own editor and review your

143. ## English

Can you please check these sentences for me? Thank you very much in advance. 1)The meeting was held in spite of the rain. 2)In spite of the fact that/although it was raining, the concert wasn't postponed. 3) The meeting was put off because of/due to/owing

144. ## Science

Who was regarded as a mad scientist?

145. ## geometry

In the accompanying diagram of triangle ABC side DE is parallel to AC. If BD is 8 and BA is 18, that is all on side d is the midpoint of BA and BC is 27 with the midpoint E what is the length of BE??

146. ## Physics

At what speed will a car round a 52-m-radius curve, banked at a 45 degree angle, if no friction is required between the road and tires to prevent the car from slipping? (g=9.8m/s^2)

147. ## Geometry

Write an equation of the straight line whose slope is 2 and whose y-intercept is the same as that of the line represented by the equation y=4x-2. What is it ?

148. ## statistics

A local tire store suspects that the mean life of a new discount tire is less that 39,000 miles. To check the claim, the store selects randomly 18 of these new discount tires. When they are tested, it is found that the mean life is 38,250 miles with a

150. ## College Physics

A 0.30-m-radius automobile tire rotates how many radians after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 5.0-s interval?

151. ## geometry

Find the area of a parallelogram with sides of 6 and 12 and an angle of 60°.

152. ## Physics

A 2 kg ball of putty moving to the right at 3m/s has a head-on inelastic collision with a 1 kg ball of putty moving to the left at 3m/s. What is the final magnitude and direction of the velocity of the stuck together balls after the collision?

153. ## english

Is Where to? a complete sentence or a fragment?

154. ## college

A 2 kg ball of putty moving to the right at 3m/s has a head-on inelastic collision with a 1 kg ball of putty moving to the left at 3m/s. What is the final magnitude and direction of the velocity of the stuck together balls after the collision?

155. ## Physics

Little Norma has mass 20kg and wants to use a 4.0-m board of mass 10kg as a seesaw. Her friends are busy, so Little Norma seesaws by herself by putting the support at the system's center of gravity when she sits on one end of the board. How far is she from

156. ## geometry

Find the area of a regular pentagon with side equal to 3 and apothem equal to K.

157. ## geometry

The sides of a rhombus with angle of 60° are 6 inches. Find the area of the rhombus.

158. ## geophysical science

if you walked 20m, took a book from a library table, turned around and walked back to your seat, what are the distance traveled and displacement?

159. ## English

Write an essay explaining how epics reveal a civilization's customs, manners, and values. Support your ideas with at least three references from The Odyssey.

160. ## Geometry HELP

1.) Given points A(-4, 5), B(2, 3), C(0, 4) and D(5, 0), decide if AB and CD are parallel, perpendicular or neither. 2.)Given the equations y = 1x + 7 and y = 3x - 2, decide whether the lines are parallel, perpendicular or neither. 3.) Given the equations

161. ## Algebra: pleace check

find the other endpoint of a line segment with the given midpoint (6,4) endpoint ((3, 5). 6= 3/2 and 4 = 5/2 12=6 and 8 = 10 12-6 and 8 - (-10) End Point = (6, 18)

162. ## Physics

Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!

163. ## math

Solve by completing the square: x^2=5x+2

164. ## trig

Find the focus, directrix and axis of the parabola with equation x= 2y^2+3? Thank you for helping me!

165. ## Algebra HELP:(

I am terrible at word problems. How do I work this? A large park is to be built in the shape of a rectangle. The length is to be 5 m shorter than three times the width. The perimeter of the park is to be 750 m. What will be the length and width of the

166. ## Geometry HELP

A line has a slope m=1/3 and it passes through the point (3, 4). Find the equation for the line in slope-intercept form. a.)y = 1/3x + 3 b.)y - 4 = 1/3(x - 3) c.)y - 3 = 1/3(x - 4)

167. ## human service management

What considerations should managers be aware of when administering progressive discipline? What considerations should managers be aware of when administering positive discipline? Explain the effect of the employment-at-will principle on the progressive and

168. ## L.A

Read the poem "Annabel Lee" and write why you think Allan's grief for his wife has made him unable to go on with his own life. Use examples from the poems.-Thanks

169. ## Geometry HELP

Write the equation for the line in slope-intercept form:Slope: m=3; Y-intercept: B=7 a.)y - 3 = 7(x - 3) b.)y = 3x + 7 c.)y = 7x - 3

170. ## college

The first difference of a sequence is 6, 10,14,18. The sum of the first two terms of the original sequence is 24. Find the first three term of the original sequence. the first term of the original sequence is?

171. ## CHEMISTRRY

What is the molarity of an HCl solution if 49.0 mL is completely titrated by 68.4 mL of an NaOh solution whose concentration is 0.333 M?

172. ## Geometry

I'm given a rhombus (BCDE) and I am supposed to make a proof. There is a diagonal across the rhombus from C to E. I am given that CE bisects angle BCD and BED. I am supposed to prove that BE is congruent to DE. If you could help me at least start writing

173. ## math

express these ratios as a fraction in simplest form 1. 25 to10 2. 14:70 3. 11:66 4. 12 to 64 5. 90 to 33 6.50 : 100

174. ## biology

What diseases can mitochondrial DNA cause? Are they hereditary?

175. ## Macroeconomic

The idea that creating incentives for individuals and firms to increase productivity leading to an increase in the long-run aggregate supply curve is a. the Ricardian equivalence theorem. b. demand-side economics. c. consistent with crowding out. d.

176. ## Literature - The Metamorphosis

The Metamorphosis is a novel by Franz Kafka which has lots of religious symbolism. For example, when an apple is thrown at Gregor and embedded in his skin. I heard that in religious symbolism, apple terms for sin. What, however, is the significance when

177. ## algebra

A man (we'll refer to him as man 1) starts from his home at 8 A.M. and drives a steady rate of 50 MPH. An hour later a second man ( man 2) starts to follow him. Draw a graph to represent these facts. From the graph find when man 2 overtakes man 1. Okay, I

178. ## Math

Describe each set of points for the given mathematical statement. (x + 3)^2 + (y - 4)^2 = 9 How would I figure this out? Any help would be great, thanks! :)