# Questions Asked onNovember 30, 2012

1. ## Chemistry

When solutions of KCl and Pb(NO3)2 are mixed, a precipitate forms. Which of the following is the balanced equation for the double replacement reaction that occurs? a. KCl(aq) + Pb(NO3)2 (aq) ¨ KNO3 (aq) + PbCl2 (s) b. KNO3 (aq) + PbCl2 (s) ¨ KCl(aq)

2. ## science, chemistry

Separate this redox reaction into its component half-reactions. O2+2Cu---->2CuO thought it was: Oxidation 2e-+O2---->2O(-2) Reduction Cu---->Cu(2+)-2e- but this is wrong

3. ## chemistry... HELPP

Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows: C5H5N + H2OC5H5NH+ + OH- The pKb of pyridine is 8.75. What is the pH of a 0.190 M

4. ## calculus

A conical water tank with vertex down has a radius of 12 feet at the top and is 23 feet high. If water flows into the tank at a rate of 20 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 17 feet deep?

5. ## PHYSICS

Light waves are electromagnetic waves that travel at 3.00 108 m/s. The eye is most sensitive to light having a wavelength of 5.50 10-7 m. (a) Find the frequency of this light wave. __________ Hz (b) Find its period. _______________ s

6. ## Math

Which of the triangles described in the table is a right triangle? Triangles: Q, R, S, T Side 1: Q = 25, R = 26, S = 25, T = 25 Side 2: Q = 20, R = 20, S = 20, T = 26 Side 3: Q = 15, R = 26, S = 1,025, T = 650

7. ## Physics

A fire hose 10 cm in diameter delivers water at the rate of 23 kg/s. The hose terminates in a nozzle 3.1 cm in diameter. (a) What is the flow speed in the hose? (b) What is the flow speed in the nozzle?

8. ## math

Find the unit rate. Round to the nearest tenth. 344 miles in 11 hours i try and try i still don't get it please anybody could help me please =(

9. ## physics

A solid sphere is released from the top of a ramp that is at a height h1 = 1.95 m. It goes down the ramp, the bottom of which is at a height of h2 = 1.38 m above the floor. The edge of the ramp is a short horizontal section from which the ball leaves to

10. ## Physics

An organ pipe is open at both ends. It is producing sound at its third harmonic, the frequency of which is 406 Hz. The speed of sound is 343 m/s. What is the length of the pipe?

11. ## MATH

An urn contains 8 pink and 7 red balls. 6 balls are randomly drawn from the urn in succession, with replacement. That is, after each draw, the selected ball is returned to the urn. What is the probability that all 6 balls drawn from the urn are pink? Round

12. ## math

(4,?) is on the line below. Find the other half of the coordinate. y=-3/4x+3

13. ## PHYSICS

A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 11.5 s. (a) How tall is the tower? _________ m (b) If this pendulum is taken to the Moon, where the

14. ## math

Thinking about the different types of numbers you learned in this unit, how would you help someone remember the differences between rational and irrational numbers? PLEASE ANSWER NICE AND NEAT AND CORRECT PLEASE AND THANK YOU!! =)

15. ## Physics

A tow truck is pulling a car out of a ditch by means of a steel cable that is 9.3 m long and has a radius of 0.50 cm. When the car just begins to move, the tension in the cable is 1070 N. How much has the cable stretched? Answer in m

16. ## CHEMISTRY

The standard electrode potential for the reduction of Eu3+(aq) to Eu2+(aq) is −0.43 V. determine which of the following is capable of reducing Eu3+(aq) to Eu2+(aq) under standard-state conditions? (a) Sn2+(aq) (b) ln(s) (c) HCN(aq) (d) La(s)

17. ## physics

Children slide down a frictionless water slide that ends at a height of 1.80 m above the pool. If a child starts from rest at point A and lands in the water at point B, a horizontal distance L = 2.43 m from the base of the slide, determine the height h of

18. ## pre calculus

For a given right triangle, side a = 400 feet and side b = 900 feet. What is the measure of angle B to the nearest degree?

19. ## physics

A car with a mass of 980 kg is initially traveling east toward an intersection with a speed of vc = 18.9 m/s and a 1500 kg pickup is traveling north toward the same intersection. The car and truck collide at the intersection and stick together. After the

20. ## Physics

A 15.0-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 5.00 m/s in 0.460 s. In

A box of weight w=2.0 N accelerates down a rough plane that is inclined at an angle 30 degrees above the horizontal. The normal force acting on the box has a magnitude n= 1.7 N, the coefficient of kinetic friction between the box and the plane is .30, and

22. ## math

3) In the country of Sweden, a bill becomes a law only if 38/50 of the senators approve it. What percentage 38/50? Answer Please !!

23. ## PHYSICS

A spring is hung from a ceiling, and an object attached to its lower end stretches the spring by a distance d = 7.70 cm from its unstretched position when the system is in equilibrium as in the figure below. If the spring constant is 48.0 N/m, determine

24. ## Chemistry

Consider the following: CH4, SiH3Cl, Ar, and CH2F2. (a) Which one will diffuse the fastest? (b) What is the rms speed (m/s) of the slowest-moving atom or molecule at 25°C?

25. ## Pre Calculus

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the measure of angle A to the nearest degree?

26. ## MATH

Harriet needs to ship a small vase. The box she will use has a volume of 216 cubic inches. If the side lengths are all the same, what is the length of each side of the box? Hint: V = S^3 PLEASE ANSWER NICE AND NEAT AND CORRECT PLEASE AND THANK YOU!! =) :-)

27. ## Math

Patsy has cheerleading practice on every fourth school day. She wants to be in the school play, but they have practice on every sixth school day. If both started on September 5th, what would be the first date that she has to choose between cheerleading and

28. ## English

How does Sandburg portray Lincoln as a politician? (in the story 'a Lincoln preface') A. practical B. misleading C. dishonest D. amateurish . I think it is A., What do you think?

29. ## pre calculus

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side a to the nearest foot?

30. ## Statistics

The time per week a student uses a lab computer is normally distributed, with a mean of 6.2 hours and a standard deviation of 0.9 hour. A student is randomly selected. a. Find the probability that a student uses a lab computer less than 4 hours per week.

31. ## Physics HELP!!

1. What is the longest wavelength for standing sound waves in a 133.9cm long tube that is open at both ends? b).What is the second longest wavelength? c).What is the third longest wavelength? d).What is the longest wavelength for a standing wave, in the

32. ## pre calculus

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?

33. ## Health

Ken's target heart rate is 122-139bpm. His resting heart rate is 73 bpm. What is his age?

34. ## math

1) Write a translation rule that maps point D(7, –3) onto point D'(2, 5). 2) Triangle ABC has coordinates A(1, 4); B(3, –2); and C(4, 2). Find the coordinates of the image A'B'C' after a reflection over the x-axis. Note: PLEASE ANSWER NICE AND NEAT AND

35. ## CHEMISTRY

Cant figure this out, I feel like the answer I keep getting is way too low. A voltaic cell is constructed that is based on the following reaction: Sn2+ (aq) +Pb(s) = Sn(s) + Pb2+ (a) If the concentration of Sn2+ in the cathode compartment is 1.00M and the

36. ## chemistry

A student measures the conductivity of a KNO3 solution and determines it to be a strong electrolyte. the student incorrectly lists the species in solution as KNO3,K+, NO3. Give the correct list of species in solution? Please help I am lost

37. ## Chemistry

An experiment that led to the formation of the new field of organic chemistry involved the synthesis of urea, CN2H4O, by the controlled reaction of ammonia and carbon dioxide. 2 NH3(g) + CO2(g)= CN2H4O(s) + H2O(l) What is the theoretical yield of urea when

38. ## physics

A projectile is shot straight up from the earth's surface at a speed of 1.50×104 .

39. ## English

1. He wants to be a famous cartoonist because he likes drawing cartoons. 2. He wants to be a famous professor because he likes teaching others and he likes learning from books. 3. He wants to be an architect because he likes drawing buildings. 4. He wants

40. ## math

Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches

41. ## math

1) Write a translation rule that maps point D(7, –3) onto point D'(2, 5). Note: PLEASE ANSWER, NEAT & CORRECT PLEASE AND THANK YOU!! =) :-) AND EXPLAIN IT GOOD STEP BY STEP, PLEASE. :)

42. ## Math

A kite is being flown at a height of 300 ft, and the wind carries the kite horizontally away at a rate of 25ft/sec. How fast must the string be let out when the kite is 500ft away?

43. ## Math

A spherical balloon is inflated with helium at the rate of 100pi ft ^3/min. How fast is the ballon's radius increasing at the instant the radius is 5ft.?

44. ## physics

As shown in the figure below, a 2.25-kg block is released from rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch

45. ## pre calculus

For a given right triangle, side a = 490 feet and side b = 960 feet. What is the measure of angle B to the nearest degree?

46. ## Calculus: Help !

The demand function for a certain brand of blank digital camcorder tapes is given by p=−0.02x^2−0.1x+24 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers'

47. ## Math [Consumer Surplus]

The demand function for a certain brand of blank digital camcorder tapes is given by p=−0.02x^2−0.1x+24 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers'

48. ## JHU

When excess solid Mg(OH)2 is shaken with 1.00 L of 1.2 M NH4Cl solution, the resulting saturated solution has pH = 9.30. Calculate the Ksp of Mg(OH)2

49. ## chem

a.)How many moles of NaOH are required to prepare 2.00L od 0.380M solution? answer is 0.760 mole of NaOH (mole/l * 2.00L) b.)What will be the molarity of a solution if 3.50 g of KOH are dissolved in water to make 150.0 mL of solution? answer is 0.52 M KOH

50. ## physics

Block a is moving with a certain acceleration along a frictionless horizontal surface. When a second block B is placed on top of block A, the acceleration of the combined block drops to 1/5 the original value. What is the ratio of the mass of A to the mass

51. ## physics

A horizontal 790-N merry-go-round of radius 1.30 m is started from rest by a constant horizontal force of 50 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 2.0 s. (Assume it is a solid cylinder.) J

52. ## physics

In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 13.0 oC. The temperature at the inside surface of the wall is 21.1 oC. The wall is 0.19 m thick and has an area of 8.3 m2. Assume that one kilowatt

53. ## math

The management of Ditton Industries has determined that the daily marginal revenue function associated with selling x units of their deluxe toaster ovens is given by the following, where R '(x) is measured in dollars/unit. (a) Find the daily total revenue

54. ## Econ

If a pure monopolist can price discriminate by separating buyers into two or more groups: A.the marginal revenue curve and the total revenue curve will now coincide. B.the marginal revenue curve will now shift to a position above the demand curve. C.the

55. ## literary

Walt Whitman's writing style can best be described as

Answer the following question in your discussion group: Sometimes people say “Give 110% of your effort.” Is it possible to give 110% of your effort? Is there ever a situation where you might have a percent over 100? If no, explain why. If yes, give a

57. ## Chemistry

Is lead non-polar covalent, polar covalent, ionic, network, or metallic and why?

58. ## sat essay

Assignment: Should heroes be defined as people who say what they think when we ourselves lack the courage to say it? Plan and write an essay in which you develop your point of view on this issue. Support your position with reasoning and examples taken from

59. ## Physics HELP!!

A loudspeaker is placed between two observers who are 113m apart, along the line connecting them. If one observer records a sound level of 51.8dB and the other records a sound level of 75.8dB, how far is the speaker from each observer? Enter the longest

60. ## Physics HELP!!

Sound enters the ear travels through the auditory canal and reaches the ear drum, The auditory canal is approximately a tube open at only one end. The other end is closed by the eardrum. A typical length for the auditory canal in an adult is about 2.775

61. ## Math

how do i figure out this equation? Joy knits a square blanket that has an area of 1,500 square inches. What is the approximate length of each side of the blanket? HELP !! Ms Sue! a 16 in b 27in 39 in 42 in i don't understand how to solve this!

62. ## Math

If A represents the number of apples purchased at 15 cents each, and B represents the number of bananas purchased at 10 cents each, which of the following represents the total value of the purchases in cents? a) A+B b) 25(A+B) c)10A+15B d) 15A+10B

63. ## Economics

Your pay stub deducts money for FICA. What does this mean? A. Money is being withheld for personal exemptions and deductions. B. Money is being withheld for excise and estate taxes. C. Money is being withheld to fund Social Security and Medicare. D. Money

64. ## Physics

A 17kg child slides down a 2.7m -high playground slide. She starts from rest, and her speed at the bottom is 1.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?

65. ## physics

a 150N boy rides a 60N bicycle a total of 200m. The frictional force against forward motion bicycle is 35N. How much work does boy do?

66. ## Math

Water is flowing at the rate of 50m^3/min from a concrete conical reservoir of base radius 45m and height 6m. How fast is is the water level falling when the water is 5m deep?

67. ## pre calculus

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side c to the nearest foot?

82. ## physics

A hydraulic brake system is shown. The area of the piston in the master cylinder is 6.32 cm^2, and the area of the piston in the brake cylinder is 1.83 cm^2. The coeﬃcient of kinetic friction between the brake shoe and the wheel drum is 0.443. How large

83. ## chemistry

Reaction: CaCO3 + 2 HCl -> CaCl2 + CO2 + H2O Calculate the molarity of hydrochloric acid solution if an initial mass of 4.568g of CaCO3 was reacted with 25.0mL of the acid and 2.678g of CaCO3 remain after the reaction is complete.

84. ## pre calculus

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?

85. ## Precalculus

invests 7000 for 1 year part at 5% part at 11% and the remainder at 13% total amount of income from these investments was $774. The amount of money invested at 13% was$1200 more than the amounts invested at 5% and 11% combined find the amount invested at

86. ## CHEMISTRY

Use the Nernst equation and data from Appendix D to calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4. (a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s)

87. ## math

Area of the four walls of a room is 108 m2. If the height and length of the room are in the ratio of 2 : 5 and the height and breadth in the ratio 4 : 5, then the area, in m2, of the floor of the room is :

88. ## pre cal

For a given right triangle, angle B = 46± and side c = 30 feet. What is the length of side a to the nearest foot?

89. ## physics

A 2.5m long pole is balanced vertically on it's tip. If it falls over with it's bottom never slipping. Find the speed of the top end of the pole just before it hits the ground.

90. ## math

Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches

91. ## physics

A 280-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest? rad/s

92. ## Physics !:(

A carbon dioxide laser is an infrared laser. A CO laser with a cavity length of 48.6cm oscillates in the m=100,000.0 mode. What is the wavelength of the laser beam? b). What is the frequency of the laser beam?

93. ## pre calculus

For a given right triangle, side a = 400 feet and side b = 900 feet.What is the measure of angle A to the nearest degree?

Part A: A cardinal (Richmondena cardinalis) of mass 4.50×10^−2 kg and a baseball of mass 0.142 kg have the same kinetic energy. What is the ratio of the cardinal's magnitude p(c) of momentum to the magnitude p(b) of the baseball's momentum? Part B: A

95. ## English

1. At school, I enjoy chatting with my close friends. 2. At school, I enjoy cleaning with other classmates. 3. At school, I enjoy playing soccer in the playground. 4. At school, I enjoy eating cookies at the school shop. 5. At school, I enjoy playing

96. ## physics

An object is projected upward from the surface of the earth with an initial speed of 2 km/s. The acceleration of gravity is 9.81 m/s^2. Find the maximum height it reaches. Answer in units of km.

97. ## physics

A 0.330-kg block of wood rests on a horizontal frictionless surface and is attached to a spring (also horizontal) with a 29.5-N/m force constant that is at its equilibrium length. A 0.0600-kg wad of Play-Doh is thrown horizontally at the block with a speed

98. ## Physics

A small ball is attached to one end of a spring that has an unstrained length of 0.202 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.18 m/s. The spring remains nearly parallel to the ground

99. ## math

Solve the proportion using cross products. 20 Miles 15 Miles ________ = __________ 50 Miles h Hours Please Answer!!!!

100. ## Math

If a 32 ft rope is cut into two sections with one section 7 times as long as the other section, how long is the shorter piece?

101. ## pre calculus

For a given right triangle, angle B = 46 degrees and side c = 30 feet.What is the measure of angle A to the nearest degree?

119. ## physics

A star the size of the sun has a mass 8 times as great. It rotates on its axis once every 12 days. It then collapses into a neutron star of radius 10km, losing three quarters of its mass in the process. How long does it take to rotate once after collapse?

120. ## PHYSICS

A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 8.31 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect

121. ## Physics

A loudspeaker diaphragm is producing a sound for 2.0 s by moving back and forth in a simple harmonic motion. The angular frequency of the motion is 8.55 104 rad/s. How many times does the diaphragm move back and forth?

122. ## maths

A girl buys 9 apples for Rs.9.60 and sells that at 11 for Rs. 12. What does she gain or loss.

123. ## Physics

A 71.4cm long tube has a 71.4cm long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. As the insert is slowly pulled out, the sound from the tuning fork creates standing waves in the tube when the total length L is

124. ## physics

in ydse, two parallel slits are made 1mm apart and a screen is placed 1m away. what is the fringe seperation when blue green light of wavelength 500 nm is used?

125. ## math

The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. p=-0.01x^2-0.1x+6 Determine the consumers' surplus if

135. ## History

How did the compromises made when writing and ratifying the Constitution encourage the development of political factions? Compare and Contrast the effectiveness of Washington’s and Adams’ presidencies in obeying and promoting the Constitution during

136. ## Calculus [Finding volume of solid]

Find the volume of the solid formed by rotating the region enclosed by x=0 x=1 y=0 y=4+x^5

137. ## politics

why did politics fall out of favor? is it now back?

138. ## math

Find the vertices, foci and eccentricity of the ellipse.Thank you 9x^2 + y^2 = 81

139. ## physics

Block A (mass 40 kg) and block B (mass 80 kg) are connected by a string of negligible mass as shown in the figure. The pulley is frictionless and has a negligible mass. If the coefficient of kinetic friction between block A and the incline is μk = 0.27

140. ## health

2. A nutrient that helps control the amount of fluid in your body sodium calorie protein nutrition I thinks its A

141. ## math

A rectangle has an area about 225m^2. the width is about 40m less than the length. Find the approximate dimensions of the playing surface. use factoring.

142. ## Adult Development and life Assesment

After seeing how she interacts with the little Maltese dog next door, Ellie's parents decide to get her a dog too. Ellie'snew Golden Retriever is much bigger and looks different, but because it is new but very similar, she understand ghow to interact wiyh

143. ## maths

The difference of compound interest and simple interest on an amount at the rate of 12% per annum for 2 years is Rs. 90/- then the amount will be -

144. ## General Chemistry

Titration between iodine and thiosulphate. Why starch solution has to be added when the solution just turned pale yellow, but not at the beginning of reaction?

145. ## Physics

A copper rod (length = 1.3 m, radius = 3.70 10-3 m) hangs down from the ceiling. A 8.3-kg object is attached to the lower end of the rod. The rod acts as a "spring", and the object oscillates vertically with a small amplitude. Ignoring the rod's mass, find

146. ## CHEMISTRY

What is oxygen extensive properties?

147. ## SAT Essay

Mainly directed to Mr. Pursley and Write Teacher but feel free to critique! Thank you so much. Assignment: Do you think that ease does not challenge us and that we need adversity to help us discover who we are? Plan and write an essay in which you develop

148. ## Chemistry

consider 1.0 L of a solution which is 0.55 M HF and 0.2 M NaF (Ka for HF = 7.2 x 10-4), Calculate the pH of this solution

149. ## math urgent urgent urgent

1)let f(x) be a polynomial function explian how to use the factor theorem to check if (x-c) is a factor of F(x) 2) use synthetic division to factor X^2-2x^2-9x+18 completly

150. ## physics

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 250 N applied to its edge causes the wheel to have an angular acceleration of 1.053 rad/s2. (a)

151. ## Math

A boat travels 1 km upstream and 1 km back. The time for the round trip is 4 hours. The speed of the stream is 5 km/hr. What is the speed of the boat in still water?

152. ## physics

1. During storm roof of house is blown off 2.It is dangerous to stand near the railway track when a train is moving with high speed

153. ## programming logic raptor

1. a.input names of students from the user, terminated by "zzz", 0,0,0, and create a data file grades with records of the following form: student (string), test1 (integer), test2(integer), test3 (integer) b. display the contents of the file grades created

154. ## Physics Help

A 3.50-inch floppy disk in a computer rotates with a period of 2.02E-1 s. What is the angular speed of the disk?

155. ## physics

A thin uniform stick having a mass of 0.680 kg and a length of 1.50 m is at rest, hanging vertically from a strong, fixed hinge at the uppermost end of the stick. The stick is free to swing back and forth in an Up-Down-East-West plane. Suddenly, the

156. ## Math

Could someone explain how to graph the following problem? I don't quite understand what "Graph H for 0 ≤ t ≤ 3 and 300 ≤ H ≤ 340" is asking me to do... The National Oceanic and Atmospheric Administration (NOAA) has been measuring atmospheric carbon

157. ## chem

What is the difference between a weak acid and a dilute acid: a strong acid and a concentrated acid? Give an example of each

158. ## college algebra

find functions f anf g so that fog equals H H(x)=ãx^2+17 please show work

159. ## Math-II ( Joint and Combined Variation)

1. R varies jointly as S and t. If R=1/6,S=1/8 and T=3, find R when S=2 and T=11. formula: R=KST 2. U varies jointly as L and H and inversely a S. If U=1.8, L=6.4, H=1.5 and S=-7.2, find U when L=4.3, H=5.1 and S=-2.2. formula: U=KLH/S Please Help!!

160. ## Calc 1

integrate from 0 to pi/4 (sec^2x)/((1+7tanx)^2)^1/3 integrate form pi^2/36 to pi^2/4 (cos(x^1/2))/(xsin(x^1/2))^1/2 integrate from 0 to pi/3 (tanx)/(2secx)^1/2

161. ## maths

When two cube of side 12 cm are joined end to end to form a cuboid then the total surface area of cuboid is

162. ## Physics

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

163. ## Calculus

integral (sqrt(100x^2-324)/x)dx

164. ## chemistry

Calculate the molarity of a solution containing 58.5mg of NaCl in 2.50mL of solution.

165. ## history

Do you think that the Korean War was merely a civil war in which the United States supported one side, or should it be considered an international war in which the United States used the United Nations to further its anticommunist policie? Can someone

166. ## Physics

What is the difference between converging and diverging waves? What happens to a converging wave after it has converged?

167. ## Physics

A source of sound (1140Hz) emits uniformly in all directions. An observer 3.09m from the source measures a sound level of 38.2dB. Calculate the average power output of the source.

168. ## Physics

A standard man shouting loudly produces a 87.4dB sound at a distance of 7.05m. At what rate does he emit sound energy? Express the result in J/s.

169. ## English

What do you have to do before you go to bed? 1. I have to vacuum the floor of my bedroom 2. I have to make the bed. 3. I have to take out blankets and a pillow from the wardrobe. 4. I have to wash my face and brush teeth. 5. I have to close all the windows

170. ## Into. Chemistry

I'm trying to do this precipitation reaction problem, but I don't understand part of it. The question is: Does a precipitate form when aq. soultions of potassium nitrate (KNO3) and sodium iodide (NaI) are mixed? Then it lists the solutions for the two:

171. ## public speaking

For communication to take place, there has to be: A. transmission of the message. B. medium. C. sharing of meaning. D. absence of noise

172. ## Finance

risk free rate 5.5% market premium 6% beta 0.8 expected dividend $1.00 common stock$25.00 growth 6% bond yeild 6.5% capital struture 25% debt 15% preferred stock 60% common equity tax rate 40% preferred stock price $95 preferred dividend$11. what firm

174. ## English

Which of the sentences below uses italics and quotation marks correctly? “You see,” he said, “there are two versions of the novel Zombie Prom at the bookstore.” “You see” he said, “there are two versions of the novel Zombie Prom at the

175. ## chemistry

The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 5.591×10−3 M−1s−1. What is the initial rate of reaction in a reactor

176. ## Adult Development and life Assesment

The training of animals (like teaching dogs to open doors for the disabled) uses principles of psychology. 1. cogntive 2. analytic 3. social 4. behavioral I think it's behavioral

177. ## Physics

My experiment setup was like this: i48.tinypic. com/14n31pl.jpg FYI, there is sandpaper between the ruler and the wall. I calculated the coefficient of friction to be 0.468. Is that correct? A second question asks that as the hanging weight is moved closer

178. ## Calc 1

integrate from 0 to pi/2 (3sinxcosx)/(1+3sin^2x)^1/2

179. ## science

1.Leeuwenhoek’s invention of the _____ made the development of the cell theory possible. * telescope * microscope * cork * magnified glass 2. Chlorophyll can be found in organelles called______. * amino acids * chloroplasts * Golgi bodies * ribosomes

Questions 1­–2 are based on "Loser." Questions 3–5 correspond to "Friends Forever." 1. What event caused the main character to change? (1 point) his date with Jenny his parents' deaths his strange talent finding the lost boy 2. How did Jenny react

181. ## math

im trying to complete this input output table input 0 output blank input 3/2 output 17/6 input 11/4 output blank input 3 output 13/3 input blank output 13/2

182. ## Algebra

Tanya is 1 year less than three times the age of her sister Jessica. Jessica is five years old. How old is Tanya? Need an equation

183. ## Algebra2

Is this right?! G(x)=x^3+2 ; x=-2.-1.0,1,2 g(-2) ; -2^3+2=-6 g(-1) ; -1^3+2=1 g(0) ; 0^3+2=2 g(1) ; 1^3+2=3 g(2) ; 2^3+2=10

184. ## 7th grade language arts Ms. Sue

1. If the following sentence was rewritten to be more specific, which would be the best revision? "It was a privilege and not a right, and you messed it up." (1 point) "It was a privilege and not a right, and you don't have it now." "It was a privilege and

185. ## physics

how much would a stationary vehicle have to accelerate in order for it to catch up to another vehicle traveling 74 miles per hour in a distance of .5 miles? what would its final speed be?

186. ## healthcare commumication

What are the advantages and disadvantages of using traditional, electronic, and social media for health care communication What are the effects of HIPAA and other regulations on the use of these media for health care communication

187. ## sslope interception form

write slope interception form the equation of the line thay passes through (0,-2) and is perpendicular to the line 3y-2x=5

188. ## Chemistry

Your x-ray lab has a monochromator consisting of a single crystal of nickel cut so that the (001) plane lies in the cube face. At what angle (in degrees) should the cube face be tilted with respect to the incident beam in order to select radiation with a

On January 1, 20X1, Parent Company acquired 80% of the common stock of Subsidiary Company for $560,000 On this. date Subsidiary had total owners' equity of$540,000, including retained earnings of $240,000. During 20X1, Subsidiary had net income of$60,000

190. ## math

the circumference of a circle is 4 inches. Find the radius and area..

191. ## Physics

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

192. ## physics

Heat Q flows spontaneously from a reservoir at 481 K into a reservoir at 298 K. Because of the spontaneous flow, 2760 J of energy is rendered unavailable for work when a Carnot engine operates between the reservoir at 298 K and a reservoir at 249 K. Find

193. ## Physics

An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 23.6dB. Assuming a porpoise emits sound at a rate of 0.0359J/s, what is the maximum distance at which the animal will still be

194. ## math

Find the area of the region under the graph of the function f on the interval [4, 10]. f(x)=10x-5 ? square units

195. ## math

Of the 85 seventh graders, 27 are going on the class field trip. What percent of the seventh graders are going on the field trip?

196. ## programming

How to convert VB2008 project in Windows Application (*.exe file)?

197. ## math

Write the percent 82.33% as a decimal.

198. ## math

If f(a) = (6-4a2)/a for all nonzero a, then f(2) = a

199. ## CHEMISTRY

Use the Nernst equation to calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4. (a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s) ____________ (b) Mg(s) |

200. ## chem

What is the difference between a weak acid and a dilute acid: a strong acid and a concentrated acid? Give an example of each

201. ## math

A motorist travelling at a steady speed of 120km/h covers a section of the highway in 30min. After a speed limit is imposed he finds that when travelling at the maximum speed allowed he takes 20 min. longer than before to cover the same section. Calculate

202. ## math

(x-3)/(6)-(7)/(15)≤(3x-1)/(10)

203. ## English

What does the quote, ""The world is not interested in what we do for a living. What they are interested in is what we have to offer freely - hope, strength, love and the power to make a difference!" mean?

204. ## PUBLIC RELATION

Can someone tell me what is the differences between public relation and legal ethics? i know there is, lawyer practise in court of aw where there is fairness and equal representation while PR work in court of opinion. Lawyers advise clients on what they

205. ## chemistry

I need the pre lab anwsers to 22, I have been studying for a test and have not finished them

206. ## MIS Nooona MBA

1- I need some ways the company use data on computers before discarding them ? 2- I want three programs that can destroy data on hard disk ? 3- Which method or program is the best for destroying data so that no body can recover it ?

207. ## AP Physics

A flagpole is to be installed on the front of an office building as shown below. The pole itself weighs 150 N and is 2 meters long. The support wire is attached at a 60º angle at a point 0.5 meters from the building. A. Find the value of the tension in

208. ## Math (Calculus)

Use implicit differentiation to find the slope of the tangent line to the curve y/(x–9y)=x^6–2 at the point (1,-1/-8). Can someone please help me? I don't understand

209. ## math

Find the vertices, foci, and eccentricity of the ellipse. Thank you. x^2/16 + y^2/25 = 1

210. ## health

1. A sickness resulting from eating food that is not safe to eat empty-calorie foods nutrition foodborne illness nutrient density

211. ## college algebra

write the expression as a single logarithm 1. In(x/x*2)+In(x+2/x)-In(x^2-4) solve the following logarithmic equation. 2. log_9(x-2)+log_9(x+1)=2 what is the exact solution? What is the decimal approximation for the solution when rounded three decimal

212. ## maths

The perimeter of the base of a cylinder is as same as the perimeter of a square whose one side is 11 cm. If the volume is 98π cm3, the height of the cylinder will be :

213. ## Analytical Chemistry

How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

214. ## Analytical Chemistry

How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

4. Which of the following is a prepositional phrase? (1 point) he didn't feel safe leaving us behind without supervision 6. Which of the following is not an interjection? (1 point) oops awesome maybe My answers: 4. without supervision 6. maybe

216. ## College History

Which of the following was NOT a result of the great migration of blacks in the 1920s? A) Blacks found they someetimes were able to work in jobs that has been closed to them in the South. B) African American consciousness was raised, providing feelings of

218. ## Darin

a teacher knows that 80 percent will score no more than 5 points above or below the class average 85 percent on the test which inequality represents the test score of 80 percent of her student.

219. ## psychology

Myelination of your brain began before you were born and will continue in a part of your brain until you are at least 70 years old. Because of this process: A your brain cells will not be pruned back and die, so you will learn more. B you will retain the

220. ## math

Walking on the circumference of a circular field a man completes one round in 400 steps. If the length of a step of the man is 66cm., the radius of the field is -

Post a 150-200 word response to the following question: Internet search engines, such as Google and Bing, have a great deal of influence and control over how we access information online. A new term, search neutrality, proposes that search engines should

222. ## statistics

Working on "Inferences from Dependent Samples" trying to find the standard deviation of the difference data. Differences: 24, 53, 100, 40, -10,71,77,70, 39, 50 n=10 d=51.4 sd=??? (Answer suppose to be 30.8336 but not coming close to this number at all)

223. ## college algebra

solve the following logarithmic equation. 1. 2log(lower2) (x-2) + log(lower2)^2=3 I do not know how to make the 2 by the g on my computer. 2. log(lower729^x) + log(lower27^x) + log(lower3^x) =9 again I do not know how to make the numbers lower case please

224. ## Physical Chemistry

Calculate DS if the temperature of 3 moles of an ideal gas with Cv,m = 1.5R is increased from 200 K to 500 K under conditions of (a) constant pressure and (b) constant volume.

225. ## Adult Development and life Assesment

Your instructor asks you to compare positive and negative reinforcement and explain your conslusions in class. what will you report . Positive reinforcement increases the frequency of responses and negative reinforcement decreases the frequency of

226. ## math

factor, 4x^2-8xy-5y^2

227. ## chemistry

Calculate the density of atoms along [011] in molybdenum (Mo) . Use only the information provided in your class Periodic Table, and express your answer in units of atoms/cm

228. ## Math

The bakery has a full tray of brownies. One customer comes in and buys 1/4 of the tray. The next customer buys 1/5 of what remained in the tray. How much did they buy and how much remains in the tray?

229. ## algebra 2

Write an equation in slope-intercept form for the line that satisfies the following condition. passes through (11, –15) and (16, 5)

A Carnot engine operates between 170°C and 23°C. How much ice can the engine melt from its exhaust after it has done 4.5 104 J of work? _____kg

231. ## physics

If an object wishes to travel 165 km at a rate of 45 mi/hr...how long will it take the object to reach their destination in hours and minutes.

232. ## Math

Mechanics are reboring a 6in deep cylinder to fit a new piston. The machine they are using increases the cylinders radius one-thousandths of an inch every 3 min. How rapidly is the cylinder volume increasing when the bore is 3.800 in.?

233. ## Chemistry

consider 1.0 L of a solution which is 0.55 M HF and 0.2 M NaF (Ka for HF = 7.2 x 10-4). Calculate the pH after 0.10 mol of HCl has been added to the original solution. Assume no volume change on addition of HCl. Goes along with the last one i posted, i

234. ## Physics

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

235. ## pre calculus

For a given right triangle, angle B = 46 degrees and side c = 30 feet.What is the length of side b to the nearest foot?

236. ## Physics

When a metal pipe is cut into two pieces, the lowest resonance frequency in one piece is 244Hz and that for the other is 454Hz. What resonant frequency would have been produced by the original length of pipe? (Assume the speed of sound in air is 345 m/s)

237. ## statistics

Find the z-score for the standard normal distribution where: P(z< -a) = 0.2451

238. ## yield

what is the theoretical yiled for 0.0300 moles of nitrobenzene if 3 ml was used.

239. ## programming

There are several types of room in a hotel. The HotelRoom Class of Previous Programming Problem was not specific regarding the type of room. Assume that a hotel has guest rooms and meeting rooms. Modify the HotelRoom class as follows: remove the capacity

240. ## math

Mrs. Jones is building a deck behind her house. Top 28 ft; Right 25 ft; Bottom 4 ft. What is the length of the unlabeled Left side of this deck? Ans. 7 ft. Book's explanation: 〖25〗^2-〖24〗^2=625-576=49=7 Where did they get 24 from? Thank you for

241. ## Math

Simplify: (n+4)! / (n+3)! =?

242. ## CHEMISTRY

cell diagram:H2(g,1atm) Pt Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits. Enter scientific notation as 1.23E4. (a) What is Ecell if the unknown solution in the half-cell on the left has pH = 4.94? ____________ (b)

243. ## math

While walking outside on a hike 66% or 20, of the students in the class wore jackets. Find the number of students in the entire class.

244. ## CHEMISTRY

Use the Nernst equation and calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4. (a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s) ____________ (b) Mg(s) |

245. ## math

for the line segment DE one edpoint is D(3,1) and the midpoint is M (0,-4). find the coordinates of endpoint E.

246. ## math

what is the dross product of c/28=49/16

247. ## Calculus [rotation of region bounded by curves]

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=3x^2, x=1, y=0 about the x-axis

248. ## English

Which of the following sentences is punctuated correctly? David wants to go skiing; however he can’t go with you this weekend. David wants to go skiing, however, he can’t go with you this weekend. David wants to go skiing; however, he can’t go with

249. ## Math :/

Point E is located at (–2, 2) and point F is located at (4, –6). What is the distance between points E and F? Please help, I have no idea!

250. ## English

1. He is a member of the swimming club 2. 2. He is a member of the Swimming Club 2. 3. He is a member of Swimming Club 2. 4. He is a member of a swimming club 2. (Which one is correct? There are two swimming clubs here. In this case which expression should

251. ## chem

Calculate the H+ ion concentration given the following pH readings: a) 2.00 b) 9.50 c) 10.40 d)-125(is this a reasonable question neee help

252. ## chem101

Processed cheese must be at a pH of 5.5 to 5.9 to prevent growth of unwanted microorganisms. If a sample comes back with [OH-]of 7.76e-9 as a control supervisor would you send the cheese back? Justify your answer. My asnswer is no but I don't know how to

253. ## chem101

Processed cheese must be at a pH of 5.5 to 5.9 to prevent growth of unwanted microorganisms. If a sample comes back with [OH-]of 7.76e-9 as a control supervisor would you send the cheese back? Justify your answer. My asnswer is no but I don't know how to

254. ## chem101

Calculate the H+ ion concentration given the following pH readings: a) 2.00 b) 9.50 c) 10.40 d)-125(is this a reasonable question neee help

255. ## Calculus

Find the limit lim x->2 (2x^2 +1)/(x^2 + 6x -4)

256. ## Algebra 2

Ryan moved into a new house with a 1750 gallon pool and needs to fill it. He can't figure out how to close his pool drain. It fills up in 1458 minutes,but it drains in 2187 1/2 minutes. When will it be full?

257. ## physics

As shown in the figure below, a stick of length L = 0.330 m and mass m = 0.205 kg is in contact with a rough floor at one end and a frictionless bowling ball (diameter d = 21.50 cm) at some other point such that the angle between the stick and the floor is

258. ## chemistry

what is cryogenetics

259. ## Calculus [Finding volume of solid]

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=x^2 y=0 x=3 about the y-axis

260. ## Calculus

What do they mean about this question below::: Find the length of the portion of the parabola bounding R Would I have to use the arc length formula or some other formula in order to solve this problem

261. ## Math

A rectangle area spans . The length must be 20ft more than the width. What are the dimensions?

262. ## social studies

Dr. Skinner is a behaviorist. Your co-worker, Terry, asks the good doctor why Baby Herbie gives a happy yell, smacks his lips, and grins every time Terry opens the cookie jar. Dr. Skinner is most likely to answer that Herbie: A is in the oral stage and is

find the domain of the composite function of fog f(x)=x^2+8;g(x)ãx-5

I forgot my class notes and I can;t find this acronym in my book. Can someone please tell me what the acronym C.L.A.S.S. stands for. I looked it up on an acronym website but has way to many. Thanks

265. ## Use of english

List fifteen differences between common noun and proper noun

266. ## hvac school

What temp would a fixed volume of gas need to be heated in order to double its pressure if it starts out at 25?

267. ## math

factor 9-900f^2

268. ## math

factor 9-900f^2

269. ## Algebra 2..

Simplify. 4i (imaginary number)

270. ## english

innnniytevebcaaasdd phrase, 3 words first 8 letters second two letters third, 9 letter question: what does basketball and hockey have in common? -------- -- --------- please answer i need it tomorrow!

271. ## psychology

Dr. Skinner is a behaviorist. Your co-worker, Terry, asks the good doctor why Baby Herbie gives a happy yell, smacks his lips, and grins every time Terry opens the cookie jar. Dr. Skinner is most likely to answer that Herbie: A is in the oral stage and is

272. ## Calculus

integral[13,4]sin^2(8x)cos^2(8x)dx

273. ## Economics

Can there be inflation with without an increase in the money supply? How?

274. ## CHEMISTRY

2.05 Grams of a liquid vaporized at 80 c in a 1 liter flask and a pressure of 1 atm. what is the molar mass of the gas?

275. ## Physics

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

276. ## Calculus

Use the substitution x=3tan() to evaluate the indefinite integral 93dx/(x^2sprt(x^2+9))

277. ## Algebra2

Is this right?? 1. f(x)= |x-5| if x≤1 ; (1)/(x+1) if x>1 f(-5) = |-5-5| = 10 f(1) = |1-5| = 4 f(3) = 1/4

278. ## Calculus

integral[7 sqrt 2/2,0]sqrt(49+x^2) dx

279. ## physics

A submarine is patrolling the ocean. Each hour, it descends 25 feet and then ascends 10 feet. At 7:00 AM, it is at a depth of –100 feet. What will its depth be at 11:00 AM?

x^6+x^7/x

286. ## Health

Depression is treatable in ________ of cases. A. 90% B. 20% C. 80% D. 50%

287. ## Math

Could someone explain what each part of this formula represents? H(t) = 0.058t^2 + 0.41t + 516 + 2.5 sin(2π)(t)

288. ## chemistry

a. what is the effect on the Kc when the temperature of an exothermic reaction is lowered? b. according to Le Chatelier's principle, how is equilibrium in part a established.

289. ## computers

what part of a presentation slowws you to add charecter data?

290. ## College History

I have quite a few that I couldn't figure out on my assignment. 1) The leading symbol of reforming state governments in rhe early 1900's was A) Theodore Roosevelt B) Woodrow Wilson C) Robert La Follette D) Upton Sinclair 2) Wilson's first dealings with

291. ## Macroeconomics

When is a large deficit desirable?

301. ## Statistics

Explain how the error term in a repeated measures ANOVA is actually an interaction

302. ## Statistics

Explain how the error term in a repeated measures ANOVA is actually an interaction

303. ## algebra

f(x)=-2+5 sketch a graph

304. ## MATH

Working on "Inferences from Dependent Samples" trying to find the standard deviation of the difference data. Differences: 24, 53, 100, 40, -10,71,77,70, 39, 50 n=10 d=51.4 sd=??? (Answer suppose to be 30.8336 but not coming close to this number at all)

asked by Inferences from Dependent Samples
305. ## Math

There are both white and brown eggs in the refrigerator. The ratio of the number of white eggs to the number of brown eggs is 3/4. Which of the following could be the number of eggs in the refrigerator?

306. ## math

46 is what percent of 280

307. ## CHEMISTRY

Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits. Enter scientific notation as 1.23E4. (a) What is Ecell if the unknown solution in the half-cell on the left has pH = 4.94? ____________ (b) What is Ecell if the unknown

asked by sabrina:yes i couldn't post the cell diagram H+
308. ## Chemistry

not much of a question but more of an appreciation, thanks for helping i was really confused before today

309. ## Algebra 2 ..

Solve (-16)^1/4

310. ## math urgent urgent urgent

perpendicular to line -2x+y=7 contains the point (-4,-2) the equation of line is

311. ## psychology -statistics

why can we use the same multiple comparison procedures for between subjects, repeated measures, and mixed designs without changing the formulas

312. ## Fraction to decimal question

Is there any way to convert to a decimal if you can't find a denominator that works your way? like 21/34 ? can you explain???

313. ## Pre Algebra

If you have 256 ft of fence for your yard. The lenth is 12 feet longer than twice the width. What are the dimensions?

314. ## Math

Determine the slope and y-intercept of the following linear equations.

315. ## Math

Determine the slope and the y-intercept of the following linear equations. 1. y = (3/2)x - 4 2. 2x + y - 3 = 0

316. ## English

Which of the items below uses apostrophes correctly? Is this jacket Kevin’s? Wait, I think it’s actually your’s. Is this jacket Kevin’s? Wait, I think it’s actually yours. Is this jacket Kevin’s? Wait, I think its actually yours. I think it is

317. ## English

Which of the items below uses apostrophes correctly? Before she could address the invitations, Jessie needed everyone’s addresses. Before she could address the invitations, Jessie needed everyones’ addresses. Before she could address the invitations,

318. ## chemistry

The number of moles in 15.39g of C2H6O?

319. ## CHEMISTRY

Co(s) will oxidize Fe(s) while leaving Cu(s) unreacted, please write a balanced equation for the reagent involved?

320. ## English

Which of the following sentences is punctuated correctly? Mom thinks we need to arrive by seven o’clock; but I don’t think that’s necessary. We will end up waiting around for the others; that will be boring. I think we should get there at eight

321. ## Math

(x)/(3)+(5)/(6)

322. ## elementary

i need help making a story with these play,fry,stays,fried,spies,spy,stay,cry spelling words

323. ## Physics

A boy throws a stone with an initial velocity of 14.6 m/s and it returns to his hand in 3 seconds. What maximum height does the stone reach?

324. ## Algebra2

is this right? 27. h(x)= |x-3| ; x=0,1,2,3,4,5,6 h(x); |0-3| =3 h(x); |1-3|=2 h(x); |2-3|=1 h(x); |4-3|=1 h(x); |5-3|=2 h(x); |6-3|=3

325. ## Algebra2

Help? f(x)=5 ; x=3,-2,-1,0,1,2,3