Marian
Most popular questions and responses by Marian
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 
CAPA
Na+ and Se2
asked on November 18, 2012 
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 
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 subprogram to output the result.
asked on March 27, 2015 
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 
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 
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 
Maths
Solve the equation, give your answer as a fraction in its lowest terms: x2= 4x+7/6 (the whole part 4x+7 is over the 6) I'm getting 6 !!
asked on February 9, 2011 
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 
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 
algebra
Factorise the expressions 9y^225 x^2x12 I'm totally stuck!
asked on March 8, 2011 
maths
x^27x = 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 7^249=0 7^2=49 4949=0 so x=7 is correct (is that explanation enough?) now i have to write out a complete
asked on March 1, 2011 
Maths
Solve the equation: Give your answer as a fraction in its lowest terms: 2x5=76x I'm getting 1/3 but i think that's wrong!?! Would appreciate some help please thanks! M
asked on February 9, 2011 
physics
What is the rotational speed of the hour hand on a clock?
asked on October 27, 2016 
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 
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 
maths
Select the option that is the equation y=2x2 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/22 or x=y/2=1 or x=y2 or x=y2
asked on February 9, 2011 
chemistry
How many moles of acetic acid are in 100ml of a 0.05M solution of acetic acid?
asked on September 1, 2010 
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 pesos.how many of each kund of coins are there?
asked on October 21, 2014 
physicslenses
trace and describe the image formed by a convex lens (object between 2f and f)
asked on March 8, 2014 
STATISTICS
TRUE OR FALSE? Simple regression cannot be applied when r of two variables is very low.
asked on September 13, 2013 
STATISTICS
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 
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 
US Government
Describe 5 customs that Americans and people from India share.
asked on April 12, 2010 
6th grade
this is for science what is solubility dependent on
asked on December 2, 2009 
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 
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 
MATHS
lim(sqrt(x^4x^2))=0 True or false?
asked on September 16, 2013 
MATHS
The function f (x) = x^4 has an axis of symmetry the vertical axis y. True or False?
asked on September 9, 2013 
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 
STATISTICS
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 
speech
what figure of speech is "it is a lovely little bright snake of a word"
asked on January 20, 2012 
maths
I've put what i think are the answers at the bottom. Consider the inequality −2
asked on February 9, 2011 
maths
I've put what i think are the answers at the bottom. Consider the inequality −2 ¡Ü d
asked on February 9, 2011 
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 uv210v taking out the
asked on February 7, 2011 
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 
space
What is space exploration?
asked on November 20, 2008 
space
What is the importance of Space exploration?
asked on November 20, 2008 
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 
Music
Can someone please give me an example of a movie or literature that would make a successful Lied.
asked on April 15, 2008

physics
Water
posted on June 25, 2019 
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 
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 
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 
MATHS
thank you steve is correct!
posted on September 16, 2013 
MATHS
i have limit x>0
posted on September 16, 2013 
MATHS
Thank you Steve!!!
posted on September 9, 2013 
MATHS
YES!!!! thank you very much!!
posted on September 9, 2013 
STATISTICS
I state at the first row... True or false?
posted on September 6, 2013 
Stats
ohhh.. Why? the significance is not 49%?
posted on August 1, 2013 
chemistry
1. Since it's at the equivalence point, the pH will be 7.00!
posted on December 4, 2012 
chemistry
my grandmother was being funny
posted on November 10, 2012 
Maths
Thanks that helps me a lot!
posted on February 9, 2011 
Math
Is this the full question? It seems confusing, something is missing in the instructions.
posted on February 9, 2011 
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 
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 
Maths
Thanks for that. hopefully I'll get a better grasp of equations soon!!
posted on February 9, 2011 
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 
maths
Thanks I understand now!
posted on February 7, 2011 
accounting
what is the firm's predetermined fixed overhead rate
posted on November 9, 2010 
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 
Chemistry
thank you! :)
posted on February 27, 2010