Questions Asked on
May 1, 2007

  1. chemistry

    i need some help with this i don't even know where to begin A solution of 62.4 g of insulin in enough water to make 1.000 L of solution has an osmotic pressure of 0.305 atm at 25°C. Based on these data, what is the molar mass (MW) of insulin (g/mol)?

    asked by Anonymous
  2. chemistry

    Is teflon a dimer? I know that it is an addition polymer, but I don't know if that classifies it as a dimer. No. A dimer is two monomers hooked together. Teflon is a polymer;i.e., many monomers hooked together. I tried to find the molar mass of teflon was

    asked by DavidG
  3. trigonometry

    A race car is driven around a circular tract at a constant speed of 180 miles per hour. If the diameter of the track is 1/2 miles, what is the angular speed of the car? Express your answer in revolutions per hour. I know the answer is 114.59 revolutions

    asked by michelle
  4. trigonometry

    The minute hand of a clock is 8 inches long. How far does the tip of the minute hand move in 30 minutes? How far does it move in 20 minutes? For 30 min. I got 8pie inches. For 20 mins., I got (16pie/3)inches. but i don't know if these answers are correct.

    asked by michelle
  5. Physics

    A wave traveling in the +x direction has an amplitude of 0.50 m, a speed of 5.7 m/s, and a frequency of 18 Hz. Write the equation of the wave in the form given by either Equation 16.3 or 16.4. (Answer in terms of t and x. Assume standard units.) please

    asked by CJ
  6. science

    explain 3 ways heat is transferred Look up the words conduction, convection, radiation.

    asked by kiara
  7. Chemistry

    1. What will happen if I add water to a FeSCN+2 solution? FeSCN+2(aq) + H2O(l) ???? 2. Will the equilibrium shift to the left or right? The FeCNS++ is red colored. I think adding water will simply dilute the red color. Won't it react in any way? Small

    asked by Fiona
  8. chemistry

    MF16014: What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M methylamine wiht 25.00 mL of 0.10 M methylammonium chloride? Assume that volumes are additive and that Kb = 3.70 x 10-4 for CH3NH2. how do i go about this question? If you know how

    asked by joe
  9. history

    What goals did the United States achieve by fighting in Korea? What goals did it fail to achieve? What goal did it achieve: A strong, independent, and stable Japan. It achieved the goal of fighting "communism" spread by Soviet Union without getting into a

    asked by Anonymous
  10. chem-speed at STP

    Hi- we were given this question and I have no clue how to figure it out...please help! Which gas molecules have the greatest average speed at STP? [a] SO2( sulfur dioxide) [b] NH3( ammonia) [c] O2( oxygen) [d] N20 (Dinitrogen oxide) Ok, at stp, that means

    asked by ty
  11. Chemistry

    A buffer is made up of .300 L each of .500 M KH2PO4 and .317 M K2HPO4. Assuming tha the volumes are additive, calculate a) the pH of the buffer b) the pH of the bugger after the addition of .0500 mol of HCl to .600 L of the buffer. c) the pH of the buffer

    asked by James
  12. chemistry

    i need help on this i don't get it MDJ OB 018: Alice looked in the looking glass and saw her image there. She invited her image to some out but the visit was short since her image found that she was starving to death and that all the food tasted bad. Why

    asked by joe
  13. chemsitry

    How will the osmotic pressure of an aqueous solution change as evaporation occurs? does it even change? or does it increase? evaporation will increase concentration, correct?

    asked by sam
  14. chemistry

    15029 What is the hydronium ion (aka H+) concentration for a solution that is 2.50 x 10-4M in hydroxide. what do i do here? The product of hydroxide and hydronium is a constant, at 25C, it is 1*10^-7

    asked by sam
  15. predication?

    what is difference between predicate predicator and predication? Clean up the most threatened areas. In grammar, the predicate is the main verb and all the words and phrases and clauses that go with it. Scroll down a bit

    asked by jessy
  16. literature

    what is the name of the man in the short story who stayed young and handsome while his painting grew old and ugly? Thank you for using the Jiskha Homework Help Forum. That is the novel by Oscar Wilde, Dorian Gray. Here is a site about that:

    asked by joann
  17. English

    How does business writing differ from academic writing? What qualities make any form of written communication effective? Check out this site. There are several types of writing: Personal and fictional

    asked by Queline
  18. math

    What does it mean by one set of numbers being a subset of the other? If 3, 4,5,6 is a set of numbers, then 4,5 is a subset.

    asked by Caitlyn
  19. Physics HELP!!!!!!!!

    A recording engineer works in a soundproofed room that is 47.5 dB quieter than the outside. If the sound intensity in the room is 1.40 x 10^-10 W/m2, what is the intensity outside? I have done this numerous times and it is still wrong! -47.5 = 10 log (1.4x

    asked by Mary
  20. calc

    let y=2x-8. What is the minimum value of the product xy? I'm not really sure how to do this... I tried taking x*(2x-8), and the min is 0. but then i wanted to see if it was the same when solving for x, and i got a min of -8. How do i do this problem?

    asked by Mischa
  21. Physics

    The fundamental frequency of a string fixed at both ends is 325 Hz. How long does it take for a wave to travel the length of this string?

    asked by Mary
  22. trigonometry

    Find the exact value of each expression(no calculator): 1) sin^2(30degrees) + 1/sec^2(20degrees) 2) sec(50degrees)*cos(50degrees)

    asked by michelle
  23. Calc Help

    q=2500+(600/r+2)-40p Find dq/dp q=3000-100z+(400/p+5) Find dq/dp Please help. Final tom and can't figure this out. I know it's simple. Yes, they are simple. Show your work, I will critique it.

    asked by Evan
  24. Calc Help

    q=(1000/p+1)^2 - 1 find q' Please help. Question on review sheet. I will be glad to help you, or critique your work. What do you think the way to solve it is>

    asked by Evan
  25. algebra 2

    i forget what the n in the factorial theorem (n/r-1) is. Does anyone know? In statistics, "n" typically stands for the number of scores in a sample. I hope this helps. Thanks for asking.

    asked by Bob
  26. Accounting

    Using a perpetual system, how do I determine the FIFO,LIFO, weighted average, and specific identification. Dec. 7, 10 units @ 6.00, Dec 14 20units @ 12.00, and Dec 21. 15 units @ 14.00 cost. trader sells 15 units for 25 each on December 15. Eight of the

    asked by Lynn
  27. Chemistry

    If the oxygen being fed into the system 4NH3(g) + 5O2(g) 4NO(g) + 6H20(g) + 950kJmol-1 is heated, how will the equilibrium shift? The reaction is exothermic, that is gives off heat, or raising the temperature. If heat is added, then the reaction will shift

    asked by Fiona
  28. chemistry

    MF015 59 What is the acid dissociation constant for HA if pH = 2.74? [HA] = 0.020M? MF12063: What is the minimum energy barrier that musts be overcome for a chemical reaction to occur? is it the activation energy? yes

    asked by sam
  29. chemistry

    MF17041: A hot penny is dropped into cold water inside a polystyrene foam cup. Assuming negligible heat loss to the cup and to the surroundings, which of the following statements would be true, if any? | DSpenny | = | DSwater | | DSpenny | > | DSwater | |

    asked by Anonymous
  30. chemistry

    MF16032: What is the percent dissociation of acetic acid if the solution has pH = 4.74 and pKa = 4.74? is it 50% yes, 50%. Do you know how to prove that? Did you calculate it or did you make an educated guess?

    asked by joe
  31. English

    Consider the sentence: Jim wore a red jacket and hat. Does the adjective red apply to both the jacket and the hat? In my opinion it does but it lacks clarity. Is there a reference anywhere to support either side of this argument? There are strong pros and

    asked by Les
  32. immediate constituents

    i really don't understand this..can someone explain? f.e.Divide into immediate constituents: 1.Full-scale computers have a large number of programs 2.We must change all the programs tomorrow 3.Tomorrow will be a holoday free Thank you for using the Jiskha

    asked by bill
  33. social studies

    the theory that government should not intefere in economic affairs is known as? A) popilism B) supply-side economics C) laissez-faire D) capitalism Here's what Populism is (assume that's what you meant): Here's what

    asked by debra

    Read the case study entitled, "Shutdown at Eastland" on page 89 in your text. How would you have handled this situation? In this assignment, propose a plan to close the assembly plant in Eastland, Michigan. In this plan, be sure to explain the following:

    asked by PAPI
  35. english essay

    hello! i have to write an essay about how those 3 articles that i picked position it's readers to respond in a certain way. i am going to write about the lauguage used, tone, verbs used, um...can someone please tell what else should i write about?and how

    asked by Twinkle
  36. english

    It’s hard to believe that a woman her age could accomplish so much. my reply is I believe this sentence is correct so no change It'd be better to leave out the "woman" and "her age" elements. How about this? ~~> It's hard to believe that a person could

    asked by Nene
  37. literature

    what is the name of the man in the short story who stayed young and handsome while his painting grew old and ugly? Thank you for using the Jiskha Homework Help Forum. It is not necessary to post the same question twice, unless you wait hours without an

    asked by joann
  38. Social Studies

    how many Us representatives are there? Thank you for using the Jiskha Homework Help Forum. Read carefully for your answer:

    asked by Dylan
  39. written communication

    Can someone check to see if these are correct and give me some ideas Rewrite the following sentences, focusing on the grammar area specified in the left column. To enter your answer, click next to the number and begin typing. If the sentence is already

    asked by Nene
  40. Business Concepts

    Can you please help me with this question? A credit card processor for e-businesses is concerned about the recent series of thefts of customer identities in the market. They are also concerned about the responsibilities around customer privacy. Privacy is

    asked by Charlene
  41. Art Appreciation

    Choose three examples of Roman engineering (any combination of public works and/or private houses) and provide the following information: Describe the item, including how it stands (arches, columns, vaults, free form, etc.). I need help with this question!

    asked by Charlene
  42. algebra word problem

    A small company produces both dollhouses and sets of doll furniture. The dollhouses take 3 hours of labor to produce, and the furniture sets take 8 hours. The labor available is limited to 400 hours per week, and the total production capacity is 100 items

    asked by TAMMY

    Deliverable Length: 2 PPT files (5-6 slides each with speaker's notes) Details: Choosing a topic (a hobby you enjoy, a business you own or would like to start, an idea for a new product) of your choice, create two simple (5-6 slides) PowerPoint

    asked by PAPI
  44. Music

    What major scale has b flat in it? Thank you for using the Jiskha Homework Help Forum. Would you believe "B Flat Major!"

    asked by Hannah
  45. Calculus

    q=(1000/p+1)^2 - 1 find q' I will be happy to critique your thinking.

    asked by Evan
  46. Calculus

    find anitderivative of 30sqroot(x+4) What is the derivative of (x+4)^(3/2) ?

    asked by Evan
  47. physics

    The fundamental frequency of a string fixed at both ends is 375 Hz. How long does it take for a wave to travel the length of this string? Please check my answer Solution: f=v/2L v=2Lf t=1/2f=l/v 1/2(375hz)= .0013 sec

    asked by Coreen
  48. physics

    An organ pipe is open at both ends. It is producing sound at its sixth harmonic, the frequency of which is 257 Hz. The speed of sound is 343 m/s. What is the length of the pipe

    asked by Coreen
  49. physics

    An organ pipe is open at both ends. It is producing sound at its sixth harmonic, the frequency of which is 257 Hz. The speed of sound is 343 m/s. What is the length of the pipe The open pipe has to be of length lambda/2, and odd number. Fundamental L=

    asked by Coreen
  50. Economics

    What does it mean when one currency is falling against another currency? That means that in the exchange market, that currency is losing value when exchanged for the other currency. Here is an exchange table showing the value of the American dollar when

    asked by Economics student
  51. physics

    The width of the doorway is 83 cm, and the speed of sound is 343 m/s. Find the diffraction angle when the frequency is each of the following. (a) 4.8 kHz If theta is the diffraction angle. Sine(theta)= lambda/slit width where lambda = wave length so you

    asked by Cavin
  52. microeconomics

    Given demand curve P=400-.05Q, at what price is total revenue maximized? There are a number of ways to do this problem. Let me use simple calculus. Total Revenue is P*Q=400Q-.05Q^2. Take the first derivitive wrt Q. MR=400-.1Q To maximize, find Q when

    asked by greg
  53. science chem

    give one example of two elements that would be placed incorrecty if they were in order of their relative atomic masses. and explain why placing these two elements like this would not be correct. Pleasw could someone help me. Co/Ni is one. Ar/K is a second

    asked by sam
  54. Economics

    Demonstrate how currency traders can leverage a small investment to produce a high rate of return. Check this site. a monopolist should produce (more, less or the same) to increase its profits?

    asked by Economics
  55. History

    In the early 1800s, Americans felt a growing sense of pride in their new nation. How did this feeling help Americans define their identity as a people? What obstacles did they face in developing this national identity? Americans were proud of the

    asked by brie
  56. math 3rd grade

    what is an arrary ? look for the answer in the back of your math book...there may be a glossary An array is a table of numbers. can you help me with my math homework on internet

    asked by angel
  57. chemistry

    In a 70-30 mix of isopropyl alcohol and water, which is the solvent? Or are they both solvents? GENERALLY, we call the one there in the larger about the solvent and the other one the solute.

    asked by anonymous
  58. math

    Please help! Simplify the rational expression. State any restrictions on the variable. 6c^2+9c ------- 3c divide 3c into each of the numerator terms. 2c + 3 Another way: Factor the numerator to get 3c(2c + 3) now you have 3c(2c + 3)/3c= 2c+3 Are there any

    asked by Rose
  59. physics

    I need to find the centripetal acceleration of my clothes dryer. How would I go about doing it... Would the tangential speed just be 2pi*R*number of rotations/time, or how would I find that? Put a shoe in the dryer. Count the number of times the shoe

    asked by Mischa
  60. economics

    Perfect competition is described at its 1. worst 2. most efficient 3. totally outdated in understanding real economic world or 4. both 1 and 2. Who is describing perfect competition?

    asked by kustudent
  61. economics

    pure monopolies are relatively rare in the real world because a. most goods have close substitutes b. monopolization of market is not profit maximizing c. only publicly owned companies can be pure monopolies d. all of the above? What do you think the

    asked by kustudent
  62. social studies and an essay thanks

    A revolution is an overthrow of the government or politic system by the people who they govern. Violence is an act of aggression and anger. Violence is never the way for justice; but according to a reactionary violence is the way. They argue violent

    asked by gube
  63. Criminal LAw

    Explain the differences between completed and incomplete criminal acts. If you can explain the difference between complete and incomplete homework, you can explain the question you asked. I need help in defining this question: Explain the differences

    asked by Christy
  64. Math

    How do you find surface area? well all you have to do is first find the pythagorom (if that is how you spell it)of the triangle then you have to find the area of everything else. ONce you are done then you have to add up all of the sides areas. After that

    asked by Tina
  65. Water Chemistry

    Can someone explain what it is meant for a solution to be supersaturated with respect to calcite? and then what is meant for a solution to be in equilibrium with calcite? Many Thanks A supersaturated solution contains more solute than is normally soluble.

    asked by Mary
  66. chem

    So I was given this question that I havetried to solve multiple times but I just can't get it. Here it is[it's a long one!] Nitroglycerin is a shock-sensative liquid that detonates by the reaction: 4 C3H5(NO3)3 -> 6 N2 + 10 H20 + 12CO2 + 02 Calculate the

    asked by amy
  67. math-factoring

    hi i was reading through the tutorials and havent really understood how to factor out a trinomial like 12x^4 - 5x^2y^2 - 2y^4 what would the 1st few steps be? Do a substitution: let v= x^2 and u= y^2 Now you have... 12v^2 - 5uv - 2u^2 (3v -2u)(4v+u) then

    asked by luke
  68. trigonometry

    How do you find: cot(-5pie/4)? you have to know that cotx = 1/tanx so you could just trustfully change your calculator to radians enter 5*pi/4, press =, press +/-, then press Tan, =, then the 1/x key you should get -1 or... you could do it the more

    asked by michelle
  69. english/ Romeo and Juliet

    anyone know an oxymoron in Romeo and Juliet in Act1? sorry for such a random question.... thxs act 1 scene i line 170 Feather of lead, bright smoke, cold fire, sick health!

    asked by Emily
  70. SAT

    What are some of the helpful mathematical formulas that we should memorize for the SAT? If you go to and wander around a bit, you'll find links to help you get ready for the SAT. There's the obvious one at the right, and more in

    asked by Anonymous
  71. Math

    what is the answer to the multplacation question ........... the question is what is the answer to 1,859 * 30 = Please do the multiplication -- either manually or with a calculator. Or put 1,859 * 30 in the Google search window.

    asked by Jessica
  72. Physics

    suppose that the separation between speakers A and B is 5.80 m and the speakers are vibrating in phase. They are playing identical 135 Hz tones, and the speed of sound is 343 m/s. What is the largest possible distance between speaker B and the observer at

    asked by Mary
  73. math-word problems with quadratics

    I have 5 questions... 1) The sum of two numbers is 12. Their product is 36. Find the two numbers. 2) The sum of two numbers is -15. Their product is -100. Find the two numbers. 3) The sum of two numbers is -8. Their product is 12. Find the two numbers. 4)

    asked by Dakota
  74. Homeowork

    I basically just have trouble staying focused and doing my homework, and often get discouraged when it looks long- how can I keep myself on track, because hw is my biggest issue? Go here , with your mom.

    asked by Travis