Saturday

January 31, 2015

January 31, 2015

Total # Posts: 72

**chemistry **

if you burn 20.2g of hydrogen and produce 1.80x10^2g of water, how much oxygen reacted?
*January 29, 2015*

**Fluid Mechanics**

the problem says: Water flows from a bathtub through a 2.5 diameter plastic pipe to a large air-filled drain...etc Here, i need to know what is the pressure at the air-filled drain? Is it equal to the atmospheric pressure? Thanks in advance.
*December 21, 2014*

**Fluid Mechanics**

I have a question in fluid mechanics...and i need to know the pressure in an air-filled drain? Is it the atmospheric pressure? Thanks in advance
*December 21, 2014*

**physics**

R=sqrt(3^2 + 4^2) =sqrt(9+16) =sqrt(25) =5 N. the two vertical and horizontal forces are basically components of the resultant. Good luck in your studies!
*December 21, 2014*

**physical**

Baseball of 0.15 kg is thrown upward at an initial velocity of 35 m/s. tow second later a 20 g bullet is fired at 250 m/s into the rising baseball . how high will the combined bullet and baseball rise.
*December 6, 2014*

**English Composition**

Your boss has asked you to investigate the types and uses of social media that might be appropriate in the workplace. In addition, you are also asked to compare and contrast the services and provide a recommendation that would be suitable to your company’s goals. ...
*October 8, 2014*

**Grammar - INTERJECTION**

Ho, ho! That was a good joke. Good heavens! You won the first price. Oh dear! You should not done that Bravo! You have won the prize. have you spent all your pocket money? Tut-tut! Did you break the cup. Hush! The king is going to speak
*May 12, 2014*

**Science(chemistry)**

how much energy is needed to change 53 grams of water from -53 degrees celsius to 160 degrees celsius ?
*April 30, 2014*

**HELP!!**

(-30,20)
*April 30, 2014*

**Math**

3/8
*April 30, 2014*

**grammar**

If you try hard enough, you will surely succeed.
*April 29, 2014*

**grammar **

Is this sentence is correct? He wanted to polish his shoes, for it were covered with mud. or else replace it with they.
*April 29, 2014*

**Math**

soybean mean is 16% protein and corn mean is 9% protein. how many pounds of each should be mixed to get a 350 pound mixture that is 13% protein?
*April 22, 2014*

**grammar - conjanction **

Choose the following words to combine these sentence. words: after and till because as but for if when since so though unless until while or 1) The children went home. It was getting dark. 2) The boys were allowed to read books. The teacher was absent. 3) Mother told us not to...
*April 8, 2014*

**Grammar**

They have not given the blanks
*April 3, 2014*

**Grammar**

1) Because 2) For 3) As 4) Till 5) when 6) but 7) So 8) But 9) If 10) While Correct the mistakes and re-post it.
*April 3, 2014*

**Grammar**

Fill in the blanks with the chosen words. words: after and till because as but for if when since so though unless until while or 1) The children went home. It was getting dark. 2) The boys were allowed to read books. The teacher was absent. 3) Mother told us not to eat. It was...
*April 3, 2014*

**engineering (logic systems design)**

Two flip-flops are connected as shown below. The delay represents wiring delay between the two clock inputs, which results in clock skew. This can cause possible loss of synchronization. The flip-flop propagation delay from clock to Q is 10 ns < tp < 15 ns, the set-up ...
*October 3, 2013*

**math**

PROCESSING CLAIMS. Joe takes x hours on the average to process a claim. whereas Ellen's average is 1 hour longer. a) write a rational function C(x) that gives the number of claims that they process while working for an 8-hour shift. b) Find C(c)
*April 5, 2013*

**math**

A pair of ordinary jeans at A-Mart costs $50 less than a pair of designer jeans at Enrico's. In fact, you can buy four pairs of A-Mart jeans for less than one pair of Enrico's jeans. What is the price range for a pair of A-Mart jeans?
*January 29, 2013*

**Math-Stat**

Jane and Bob are on the same game show. They answer one question, either True or False. The probability that Bob is correct is 70%. The probability that Jane is correct is also 70%. Moreover, the probability that Bob is correct given Jane is either correct or incorrect is ...
*January 29, 2013*

**math**

Investing inhertance.Norman invested one-half of his inheritance in a CD that had a 10% annoul yield. He lent one-quarter of of his inheritance to his brother -in-law at 12% simple interest. His income from these two investments was $6400 for 1 year. How much was the inheritance?
*January 29, 2013*

**math**

the answer is none just for the uter number
*December 2, 2012*

**physics**

A mass m = 17.0 kg is pulled along a horizontal floor with NO friction for a distance d =5.1 m. Then the mass is pulled up an incline that makes an angle è = 30.0° with the horizontal and has a coefficient of kinetic friction ìk = 0.34. The entire time the ...
*October 18, 2012*

**Physics**

A woman weighing 500 N stands in an elevator that is traveling upward. At a given instant the speed of the elevator as well as the women is 10m/s and both are decreasing at a rate of 2 m/s2 at that instant the elevator is exerts a force on the woman that is
*September 4, 2012*

**chemistry**

Calculate the value of Kc for 4NH3(g) + 3O2(g)= 2N2(g) + 6H2O(l)
*July 12, 2012*

**chemical equilibrium**

Calculate the value of Kc for 4NH3(g) + 3O2(g)= 2N2(g) + 6H2O(l)
*July 9, 2012*

**Chemistry**

1. An aqueous solution contains 0.154 M ascorbic acid (H2C6H6O6) and 0.196 M hydrobromic acid. Calculate the ascorbate (C6H6O62-) ion concentration in this solution. Can you explain how to do this please? thank you. Also if you can is number 2 missing information or am I ...
*April 26, 2012*

**Chemistry**

What volume of hydrogen sulfide is required to produce 161 liters of sulfur dioxide according to the following reaction? (All gases are at the same temperature and pressure.) hydrogen sulfide (g) + oxygen (g)----> water (l) + sulfur dioxide (g)
*April 25, 2012*

**Chemistry**

How many moles of hydrogen gas are required to react completely with 807 L of ethylene (C2H4) according to the following reaction at 0oC and 1 atm? hydrogen (g) + ethylene (C2H4) (g)---> ethane (C2H6) (g) Should I use the ideal gas law here?
*April 25, 2012*

**Chemistry**

Don't you have to divide moles of calcium carbonate by 2 to get moles of carbon dioxide? and then multiply by 0.0821 and 273 and then divide by 1?
*April 25, 2012*

**Chemistry**

is 10.97 L correct?
*April 25, 2012*

**Chemistry**

What volume of carbon dioxide is produced when 0.979 mol of calcium carbonate reacts completely according to the following reaction at 0oC and 1 atm? calcium carbonate (s)---> calcium oxide (s) + carbon dioxide (g) Should I use the ideal gas law?
*April 25, 2012*

**environment**

I want the answer to 5 ways in which the environmental problem impacts on the commumity
*April 22, 2012*

**Chemistry**

What is the pH of 1.0M Na2SO3 (aq)solution at 25C? a) 3.40 b) 6.03 c) 10.60 d) 7.96 e) 10.40 How can I get ph from only the Molarity?
*April 3, 2012*

**Chemistry**

What is the equilibrium constant for the reaction of ammonium ion with formate ion? I know that the ionization constant for ammonium ion is Ka=5.6e-10 and for formate Kb=5.6e-11. a) 1.0 X 10-13 b) 5.6 X 10-11 c) 3.1 X 10-6 d) 1.8 X 10-5 e) 3.2 X 105 I dont know what to do? Do ...
*April 3, 2012*

**Chemistry**

For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than the activation ...
*March 1, 2012*

**Chemistry**

A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be a) rate = k (A)^2 b) rate = k (B)^2 c) rate = k (A) (B) d) rate = k (A) (B)^2 I think its D because there are 2 moles of B and 1 mole of A. Do you agree with my ...
*February 24, 2012*

**Chemistry**

The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which one of the following ...
*February 24, 2012*

**Chemistry**

So based of the rule of thumb, its going to be 5 times faster. Also how can I use Arrhenius equation without the rate constant (k)?
*February 23, 2012*

**Chemistry**

A particular reaction has an activation energy of 51.6 kJ/mol-rxn. How much faster is the reaction at 50 oC versus 25 oC? a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast I think it would be A??
*February 23, 2012*

**chemistry**

pv=nrt
*December 6, 2011*

**Math, Finance**

PMT= $2363.1
*November 9, 2011*

**94.5**

gpa?????
*October 16, 2011*

**Physics**

a =f/m
*April 28, 2011*

**chemistry**

if i want to change the pH of any solution from 5 to 8 what the volume of NaOH 0.1 N needed
*March 9, 2011*

**Chemistry**

70 ml of water
*March 8, 2011*

**religion**

a muslim traveler
*March 8, 2011*

**math**

gcf of 8/5
*February 23, 2011*

**Digit Problems**

1000000
*February 1, 2011*

**physics**

for starting from rest and moving in a straight line,runner achieves a velocity of 7m/s in a time of 2 seconds .what is the average acceleration of the runer.
*January 20, 2011*

**math**

55+99=154
*December 15, 2010*

**finance**

If you put up $40,000 today in exchange for a 6.25 percent, 15-year annuity, what will the annual cash flow be?
*April 15, 2010*

**Chemistry**

pH = -log(concentration) pH of HClO4= -log(5.8x 10^-2 M) use a calculator and figure it out do the same for the second.
*March 21, 2010*

**chemistry**

Okay first lets figure out the equation P+H2---->PH3 balance it now we have: 2P + 3H2 --->2PH3 equation is now balanced. let us now find the reactant in excess 2 moles of P= 3 moles of H2 2(31)g of P = 3(2)g of H2 6.2 g of P= x x= 6.2x6/62= 0.6 g of H2 4 grams of H2 are ...
*March 21, 2010*

**Math**

Wait I think I got it The equation can be written as x-4x^-2 so d/dx(x)=1 and d/dx(-4x^-2)= -2(-4)(x^-2-1) which is 8x^-3 d/dx(x-4/x^2)= 1+8x^-3 correct?
*March 21, 2010*

**Math**

What is the derivative of x - 4/x square. Just the denominator is squared.
*March 21, 2010*

**Math**

Its A The set S has 4 elements which are f h m and r
*March 21, 2010*

**Math**

what is a verbalrepresentation of a decimal number like 0.65
*November 16, 2009*

**Chemistry**

Why is zinc used to coat Iron and not the other way around? Why is Iron not recommended in construction of steam pipes?
*October 19, 2009*

**Biology**

B for the second question
*October 6, 2009*

**math**

who broke that windown? algebra1
*October 5, 2009*

**maths**

8_6
*October 4, 2009*

**optimization**

Suppose you are a fill-dirt contractor and you have been hired to transport 400 yd3 of material across a large river. To transport the material, a container must be constructed. The following cost data are available: Each round trip costs $4.20 and material costs for the ...
*October 3, 2009*

**calculus**

I need help with calculus...
*October 28, 2008*

**Algebra, PLEASE HELP ME!!!**

There are to points : (42,20) , (52,10) m=(20-10)/(42-52)= -1 => m=-1 choose any point from the two points . (42,20)=(x1,p1) p-p1=m(x-x1) => p-20=-1(x-42) p=-x+42+20 => p=-x+62
*September 1, 2008*

**Math**

(8.66 10^-9 m )x( 1mm / 10^-3 m ) =(8.66 10^-9 )x( 1mm / 10^-3 ) = 8.66 x 10^-6 mm
*August 31, 2008*

**note to Mohamed**

thanks for note Reiny .
*August 31, 2008*

**Pre-Calculus-check answers**

1) cscθ = (-5/3) , θ is in third quadrant 1/sinθ = (-5/3) => sinθ= -3/5 θ= -36.8699 θ is in third quadrant so θ = 36.8669+180 = 216.8669 tan2θ = tan2(216.8669) = 3.42724 = 24/7 answer : c
*August 31, 2008*

**Pre-Calculus-check answers**

1) cosθ=0.8 , θ is in fourth quadrant θ= cos^(-1)0.8=36.86989765 + 270=306.87 so , sin 2θ= sin2(306.87)= -0.96 answer : a
*August 31, 2008*

**calculus**

integral of(1/3)tan(3x)dx = (1/3)integral of(sin3x/cos 3x) dx = (1/3)ln|sin 3x| + C then the final answer is (x tan3x)/3 - (1/3)ln|sin 3x| + C
*August 30, 2008*

**languagesart grammer**

grammer
*August 26, 2008*

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