Most popular questions and responses by Marian
  1. Chemistry

    The chemical reaction of 100 g of salicylic acid, C7H6O3, with excess acetic anhydride produces 50.0 g of aspirin, C9H8O4, according to the equation. What is the percentage yield for the reaction shown below? Please show your work. C7H6O3 + C4H6O3 →

    asked on February 27, 2010
  2. CAPA

    Na+ and Se2-

    asked on November 18, 2012
  3. algebra 1

    h=-16t2+20t+24 gives the height h of the rock after t seconds. how many seconds does it take for the rock to hit the water 24+20=16t 44=16t 44/16=16/16 2.75 seconds

    asked on December 16, 2014
  4. programming concepts

    Input a list of positive numbers ( terminated by 0) into an array, find the mean ( average) of the numbers in the array, and output the result. Use a subprogram to input the numbers, a function to find the mean, and a sub-program to output the result.

    asked on March 27, 2015
  5. physics

    Which of the following is true about frictional forces? 1) They are stored as frictional potential energy. 2) They can decrease kinetic energy. 3) They produce heat potential energy. 4) They eventually convert to electromagnetic potential energy. 5) They

    asked on October 25, 2016
  6. maths

    This question is about plotting two points and drawing the straight line through them. Which two options are correct instructions for plotting two points which can then be used to draw the line y=2x+5. Select one or more. A) Plot the points (1.3) and

    asked on February 9, 2011
  7. Physics

    A 23.9kg box rests on a table. A 16 kg box is placed on top of the first box, as shown. determine the total in N that the table exerts on the first box.

    asked on October 8, 2013
  8. Maths

    Solve the equation, give your answer as a fraction in its lowest terms: x-2= 4x+7/6 (the whole part 4x+7 is over the 6) I'm getting -6 !!

    asked on February 9, 2011
  9. general math

    A souvenir store charges PHP 15.00 per keychain for orders amounting 50 or fewer keychains, PHP 12.50 per keychains for orders of 75 or fewer but more than 50 kechains. Which function best represents the cost K(x) of the x number of keychains. hi. i hope

    asked on July 21, 2016
  10. Battle

    The cost of chicken wings at the local supermarket increased from $1.29 a pound the last month. About what percent increase I'd this?

    asked on August 7, 2015
  11. algebra

    Factorise the expressions 9y^2-25 x^2-x-12 I'm totally stuck!

    asked on March 8, 2011
  12. maths

    x^2-7x = 0 substitue x=7 into the equatiopn and explain why this shows that x=7 is the solution. ok so i do this: if x=7 then the equation becomes 7^2-49=0 7^2=49 49-49=0 so x=7 is correct (is that explanation enough?) now i have to write out a complete

    asked on March 1, 2011
  13. Maths

    Solve the equation: Give your answer as a fraction in its lowest terms: 2x-5=7-6x I'm getting -1/3 but i think that's wrong!?! Would appreciate some help please thanks! M

    asked on February 9, 2011
  14. physics

    What is the rotational speed of the hour hand on a clock?

    asked on October 27, 2016
  15. Stats

    There are two boxes, each with several million tickets marked “1” or “0”. The two boxes have the same number of tickets, but in one of the boxes, 49% of the tickets are marked “1” and in the other box 50.5% of the tickets are marked “1”.

    asked on August 1, 2013
  16. chemistry

    How many moles are in 1.50 x 1023 molecules NH3? A. 2.49 x 10 -1 mol NH3 B. 2.49 x 101 mol NH3 C. 2.65 x 10 -1 mol NH3 D. 2.78 x 10 1 mol NH3 maybe B

    asked on November 10, 2012
  17. maths

    Select the option that is the equation y=2x-2 rearranged to make x the subject of the equation. Select one: x=y+1 or x=-y/2+1 or x=-y+1 or x=-y/2-2 or x=y/2=1 or x=y-2 or x=-y-2              

    asked on February 9, 2011
  18. chemistry

    How many moles of acetic acid are in 100ml of a 0.05M solution of acetic acid?

    asked on September 1, 2010
  19. Algebra

    A coin purse contains 5 centavo, 10 centavo and 25 centavo coin is 3 times as many 5 coinand the 25 centavo coins is two more than 10 centavo. And the total value is 4.90 many of each kund of coins are there?

    asked on October 21, 2014
  20. physics-lenses

    trace and describe the image formed by a convex lens (object between 2f and f)

    asked on March 8, 2014

    TRUE OR FALSE? Simple regression cannot be applied when r of two variables is very low.

    asked on September 13, 2013

    Researchers asked questions in 1001 randomly selected adults in Russia. We found a statistically significant, strong positive correlation between income and the number of recycling bins filled their houses per week (r = 0,77). Choose the best

    asked on September 6, 2013
  23. chemistry

    How many atoms of H are in 6.0 moles of H2O? A. 7.22 x 1024 atoms B. 7.12 x 1027 atoms C. 7.32 x 1024 atoms D. 7.72 x 1024 atoms A

    asked on November 10, 2012
  24. US Government

    Describe 5 customs that Americans and people from India share.

    asked on April 12, 2010
  25. 6th grade

    this is for science what is solubility dependent on

    asked on December 2, 2009
  26. math

    if the manufacture from the question above charge a 4 1/2 late fee, how much would city cellular owe if they did not pay the balance by the net date?

    asked on November 22, 2013
  27. MATHS

    The slope of the straight line passing through the points (0,0) and (3,2) is: 2/3 TRUE OR FALSE?

    asked on September 16, 2013
  28. MATHS

    lim(sqrt(x^4-x^2))=0 True or false?

    asked on September 16, 2013
  29. MATHS

    The function f (x) = x^4 has an axis of symmetry the vertical axis y. True or False?

    asked on September 9, 2013
  30. MATHS

    In the values interval [0, 2p] the function f (x) = sin(x) has more periods by the function g (x) = sin(3x). True or False?

    asked on September 9, 2013

    True or False? A researcher is interested in studying whether there is a correlation of IQ with health. For this purpose he selected a sample of 261 people and asked them to complete two questionnaires: one for IQ and one for health. After evaluating the

    asked on September 6, 2013
  32. speech

    what figure of speech is "it is a lovely little bright snake of a word"

    asked on January 20, 2012
  33. maths

    I've put what i think are the answers at the bottom. Consider the inequality −2

    asked on February 9, 2011
  34. maths

    I've put what i think are the answers at the bottom. Consider the inequality −2 ¡Ü d 

    asked on February 9, 2011
  35. maths

    I'm stuck here don't have a clue what to do. I've read all my school textbooks but it doesn't make much sense!! The numbers after the letters are small figures as in they u3 meaning( u x u x u). Ta! Factorise the expression 5 u3v +15 uv2-10v taking out the

    asked on February 7, 2011
  36. maths

    I am trying to understand what to do here.. need help asap!! Thanks! M Solve the following pair of simultaneous linear equations. 3x + 4y =5 2x + 2y =2 Select the option corresponds to the solution. Select one: x = 9 / 7, y = 2 / 7 

    asked on February 7, 2011
  37. space

    What is space exploration?

    asked on November 20, 2008
  38. space

    What is the importance of Space exploration?

    asked on November 20, 2008
  39. Science

    What is the maximum that a shell can hold for electrons? What if there are 31 electrons?? I'm confused...

    asked on September 24, 2008
  40. Music

    Can someone please give me an example of a movie or literature that would make a successful Lied.

    asked on April 15, 2008
  1. physics


    posted on June 25, 2019
  2. Dynamics

    For the angle.. the formula of coefficient of friction is tan θ=f θ=tan^-1(0.60) θ=30.96­­º >>degree of friction the formula to use for the angle from the horizontal is tan(θ(horizontal)-θ(friction))=v²/gr input the values and you will get

    posted on July 20, 2018
  3. Dynamics

    A) V=35.3 mph, angle=31 deg g=gravity, u=coefficient of friction, r=radius, m=mass (which will be cancelled out later) N=m(v^2/r) uN=mg u(m(v^2/r)=mg You will get a formula of √rg/n for velocity v=√50(32.2)/0.6 v=51.8 ft/s or 35.3 mph

    posted on July 20, 2018
  4. accounting

    Customer relations are usually part of: A. the supply chain B. the value chain. C. both the value chain and the supply D. neither the value chain nor the supply chain

    posted on November 29, 2015
  5. MATHS

    thank you steve is correct!

    posted on September 16, 2013
  6. MATHS

    i have limit x->0

    posted on September 16, 2013
  7. MATHS

    Thank you Steve!!!

    posted on September 9, 2013
  8. MATHS

    YES!!!! thank you very much!!

    posted on September 9, 2013

    I state at the first row... True or false?

    posted on September 6, 2013
  10. Stats

    ohhh.. Why? the significance is not 49%?

    posted on August 1, 2013
  11. chemistry

    1. Since it's at the equivalence point, the pH will be 7.00!

    posted on December 4, 2012
  12. chemistry

    my grandmother was being funny

    posted on November 10, 2012
  13. Maths

    Thanks that helps me a lot!

    posted on February 9, 2011
  14. Math

    Is this the full question? It seems confusing, something is missing in the instructions.

    posted on February 9, 2011
  15. Maths

    Thanks. The final answer is 8 (if I'm right) but that means its not a fraction. so do I have to do something else or am I that bad at maths that I'm wrong again!!

    posted on February 9, 2011
  16. Maths

    Maybe I'm reading it wrong but it looks like two DIFFERENT answers. Mykmoloko how'd you come up with the answer -3, I'm trying to understnad the way the methods work. Thanks M

    posted on February 9, 2011
  17. Maths

    Thanks for that. hopefully I'll get a better grasp of equations soon!!

    posted on February 9, 2011
  18. Maths

    Thanks. i got -60 the first time, but when i was checking it I was getting -6 so I'll have to see what i was doing wrong! Thanks!!

    posted on February 9, 2011
  19. maths

    Thanks I understand now!

    posted on February 7, 2011
  20. accounting

    what is the firm's predetermined fixed overhead rate

    posted on November 9, 2010
  21. US Government

    Thanks so much! All I could find was that they also throw rice at weddings. I found a lot of differences in cultures, but couldn't find any specific similarities. Can you think of any more?

    posted on April 12, 2010
  22. Chemistry

    thank you! :)

    posted on February 27, 2010