Sunday

December 21, 2014

December 21, 2014

Total # Posts: 343

**Chem**

Why does the reaction of (Z)-butenedioic acid (fumaric acid) with 1,3-cyclopentadiene give only one product? I don't know where to start. Thanks.
*August 23, 2010*

**PSYCHOLOGY**

5. a
*July 17, 2010*

**algebra**

find the domain of the function p(x) = x^2 - 2x + 10
*July 8, 2010*

**chemistry**

Why do you need to use amount in moles to solve stoichiometry problems? Why can’t you just convert from mass to mass?
*June 2, 2010*

**chemistry**

The equation for burning C2H2 is 2C2H2(g) + 5O2(g) ⎯→ 4CO2(g) + 2H2O(g) a. If 15.9 L C2H2 react at STP, how many moles of CO2 are produced? (Hint: At STP, 1 mol = 22.41 L for any gas.) b. How many milliliters of CO2 (density = 1.977 g/L) can be made when 59.3 mL O2...
*June 2, 2010*

**geometry**

B is the midpoint of Symbol for segment AC. AB=3x-6 BC=2x+2 What is the value of AB? Show your work for credit.
*May 9, 2010*

**Chemistry**

Hello, I'm wondering what the difference is in method when it comes to finding the pH of a weak acid versus finding the pH of a strong acid? Thanks!
*April 26, 2010*

**chemistry **

what is the molarity of a 50% by mass solution of NaOH id the density of the solution is 1.05 g/ml
*April 19, 2010*

**economics**

Why would flat panel TV prices drop over time?
*March 28, 2010*

**Can anyone help me with a physics question?**

A water tank has a volume of 100m^3. A square pipe leading to a pump is designed to completely replace all water in 20 minutes. Caluclate the length of a side of the square if the water is travelling at 5.0m/s through the square pipe.
*March 16, 2010*

**Computer Science**

Using the operations push(E obj), peek(), pop(), empty() give a Java implementation of the method // Reverses the elements in the stack //and returns the result. // The stack passed as an argument to //reverse() will be // destroyed upon return. public static StackInt reverse...
*March 11, 2010*

**calculus**

This limit represents the derivative of some function f at some number a. Select an appropriate f and a. 1f(x) = x4, a = 4 f(x) = x1/4, a = 4 f(x) = x1/4, a = 256 f(x) = ãx, a = 256 f(x) = ãx, a = 16
*February 24, 2010*

**calculus**

plzzz help!!!
*February 24, 2010*

**calculus**

A particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. Find the velocity and speed when t = 9. f(t) = t ^-1 - t
*February 24, 2010*

**calculus**

Consider the function below. g(x) = 2 - x^3 (a) Find g'(0). (b) Use it to find an equation of the tangent line to the curve y = 2 - x^3 at the point (0,2).
*February 24, 2010*

**College Physics**

1/2 P(intitial)
*February 8, 2010*

**trig**

find the exact value of cos(theta) if the terminal side of angle(theta) contains the point (-3,5)
*January 31, 2010*

**8th grade**

a rabbit can climb one or two steps at a time on a ten step staircase, but he never goes back down. In how many different ways can the rabbit climb a flight of ten steps
*January 26, 2010*

**Trigonometry**

A little boy is flying a kite. The string of the kite makes an angle of 30 dgrees with the ground. If the height of the kite is h equals 15 m, find the length (in meters)of the string that the boy has used.
*January 24, 2010*

**Trigonometry**

i dont know..i just need help.
*January 24, 2010*

**Trigonometry**

A pole with a height of 60 ft. has a shadow of length of 34.64 ft at a particular instant of time. Find the angle of elevation of the sun at this point of time.
*January 24, 2010*

**american government**

what two actions could congress take to undo a supreme court ruling that a federal law is unconstitutional? explain the advantages and disadvantages of each action?
*January 21, 2010*

**AMERICAN GOVERNMENT**

EXPLAIN PRESIDENTIAL SUCCESSION STEPS.
*January 19, 2010*

**AMERICAN GOVERNMENT**

THREE CONSTITUTIONAL REQUIREMENTS TO BECOME PRESIDENT OF THE U.S.?
*January 19, 2010*

**AMERICAN GOVERNMENT**

LIST 6 MAJOR ROLES OF THE PRESIDENT?
*January 19, 2010*

**AMERICAN GOVERNMENT**

LIST FOUR FACTORS AFFECTING VOTER TURNOUT?
*January 19, 2010*

**american government**

LIST FOUR FACTORS AFFECTING VOTER TURNOUT?
*January 13, 2010*

**Chem answer check **

Do these look right? What shape does an ammonia (NH3) molecule have?trigonal pyramidal In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none In a polar bond, electrons are? completely transferred What determines the polarity ...
*November 24, 2009*

**Algebra**

factor the expression csquared + 10c + 25
*November 9, 2009*

**Algebra **

csquared + 10c + 25 factor the expression...
*November 9, 2009*

**Programming**

Here is the source code for the Kitty class: public class Kitty { String name; int age; public Kitty(){ } public void setName(String n){ name = n; } public String getName(){ return name; } public void setAge(int a){ age = a; } public int getAge(){ return age; } } 1) The array ...
*October 28, 2009*

**physics**

Sorry i see the mistake I made for m the acceleration would be negative since its moving down
*October 10, 2009*

**physics**

from the FBDs wouldnt u get for M: Fy = N-WM=Ma Fx=T=Ma for m: Fy= T-Wm=ma Fx= T-W=ma then solve for a in M of Fx and sub a into m of Fx to get T?
*October 10, 2009*

**Geometry **

I need to invest on that calculator thanks Kerri
*September 10, 2009*

**Geometry **

that explains it better thanks Reiny
*September 10, 2009*

**Geometry **

what is the formula or how did you get that answer?
*September 10, 2009*

**Geometry **

The sides of a square each measures 4 ¾ inches. Find the area of the square as a fraction or mix number. (Do not use decimals)
*September 10, 2009*

**Grammar**

Are the following sentences punctuated correctly? Although, there is no definite evidence of malignancy, a biopsy should still be performed. He is incidentally, allergic to contrast material. Surgery, is not in my opinion indicated at this time.
*July 18, 2009*

**Grammar**

Are the following sentences punctuated correctly? The lung exam showed no rales, rhonchi or wheezes. She has a history of cough, not productive, that keeps her awake at night. The patient is a well-developed, well-nourished, badly sunburned cantankerous white male.
*July 18, 2009*

**science**

because it has a lot of gas in it??
*June 6, 2009*

**science**

which of the following is formed from molten rock that contains large amounts of gasses?? A: Rhyolite B: granite C:basalt D: pumice
*June 6, 2009*

**Algebra**

How do I do radical 7/10... my answer was 4 radical 3 over 6... is that correct?
*May 10, 2009*

**MATH**

24 pages
*May 10, 2009*

**College Chemistry**

[H30+] = 10^-(pH goes here) A log is an exponent. Since pH is a negative log, it's an exponent with a negative sign on it (with an implied base of 10).
*April 26, 2009*

**Econ**

In which of the following circumstances would a buyer be indifferent about buying a good? a. The amount of consumer surplus the buyer would experience as a result of buying the good is zero. b. The price of the good is equal to the buyer's willingness to pay for the good. ...
*March 30, 2009*

**Econ**

A result of welfare economics is that the equilibrium price of a product is considered to be the best price because it a. maximizes total revenue for firms and maximizes the quantity supplied of the product. b. maximizes the combined welfare of buyers and sellers. c. minimizes...
*March 30, 2009*

**science**

what do the tropic of capricon, tropic of cancer lines, artic, an antartic circles represent?
*March 26, 2009*

**science**

how were the latitudes of the tropic of cancer, tropic of capricorn, Arctic circle, and Antarctic circle determined?
*March 26, 2009*

**science**

heyy my friend rob needs help can u help him too?
*March 26, 2009*

**math**

Given: They collected 49 + 72 + 108 + 121 = 350 lbs of cans. So, the KNOWN part of the question is, “These folks collected 350 lbs of cans.” Answer: 10 I say the answer, 10, is really, “10 cents per pound.” Therefore, the UNKNOWN part of the question is, &#...
*March 17, 2009*

**4th grade math**

Sixty-five hundredTHs is 0.65 (0.065 would be sixty-five thousandths).
*January 13, 2009*

**rehabilitation**

under what circumstances is it easy to turn your will and life over to the care of god
*January 7, 2009*

**Algebra**

I have to solve the following equation: x+y=9 xy=54 I changed the first equation to y=9-x to solve for y. I got x(9-x)=54 and then 9x-x^2=54. I then changed 9x-x^2= 54 to -x^2 +9x-54=0. I got stuck around here, can someone explain...
*January 2, 2009*

**math**

hi i was wondering how would you find the equation of a parabola with it's vertex at -2,0, and with no directrix or focus given. the parobala opens toward the left. the two choices in my multiple choice answer sheet that sound the most logical would be x+2=-1/8y^2 and x-2=...
*November 29, 2008*

**Trigonometry**

cos2x(2cosx+1)=0 x=?
*November 17, 2008*

**calculus I**

thanks!!
*October 19, 2008*

**calculus I**

Find the tangent line approximation to 1/x when x=1 How do i find tangent line approximations??? my prof hasn't gone over this and i don't understand how to do it.
*October 19, 2008*

**Caculus I**

If f is decreasing and f(20)=10, which of the following must be incorrect? Explain. a. (f^-1)'(20)=-3 b. (f^-1)'(10)=12 how do i work this problem? i'm kind of confused about inverse functions.
*October 19, 2008*

**6th grade advanced math**

14
*October 19, 2008*

**history**

what items would you carry on a trip in the 15th century?
*October 5, 2008*

**chemistry**

dfgdfgdfsgd
*September 8, 2008*

**calculus**

Given f(x)=2x^3-7 find f^-1(x) and then find f^-1(-2) I though that this meant inverse function. x=2y^3-7 x+7=2y^3 (x+7)/2=y^3 ((x+7)/2)^(1/3)=y so this meant f^-1(-2) = 1.35721 The professor posted the answer as being 6. I'm not sure if I misunderstood the question or if ...
*August 24, 2008*

**Math**

For a period of time as an alligator grows, its mass is proportional to the cube of its length. When the alligator's length changes by 15.8%, its mass increases by 17.3kg. Find its mass at the end of this process.
*August 19, 2008*

**Science**

An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT? A) a ball striking a wall, in which the force of the ball on the wall is equal...
*July 18, 2008*

**Science**

Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...
*July 18, 2008*

**HELP! ASAP! SPANISH!**

i am writing a poem for spanish and in the poem we have to say a phrase about an animal. i have a crocodile. what is a good phrase that i can say in spanish about a croc? thanks sooo much!
*May 18, 2008*

**history**

in 1920 the republicans did something they hadn't done in a very long time. What was it?
*April 28, 2008*

**Physics**

List at least two major potential asvantages of power production by fusion rather than by fission.
*April 25, 2008*

**Physics**

Explain how redioactive decay has always warmed the Earth from the inside and how nuclear fusion has always warmed the Earth from the outside.
*April 25, 2008*

**Physics**

If a pair of carbon atoms were fused, and the product were to emit a beta particle, what element would be produced?
*April 25, 2008*

**Physics**

Mixing copper and zinc atoms produces the alloy brass. What would be produced with the fusion of copper and zinc nuclei?
*April 25, 2008*

**Physics**

Which process would release energy from gold, fission or fusion? Which would release energy from carbon? From iron?
*April 25, 2008*

**RECETAS**

jugo de naranja? vas al supermarche
*April 25, 2008*

**chemistry**

How many grams of NaOH are present in 5.0 mL of a 1.0% (m/v) NaOH solution?
*April 25, 2008*

**chemistry**

thank you! Irvine is bomb Chem 1C is a bummer lol
*April 7, 2008*

**Physics**

Who was the scientist that invented the uncertainty principle ? Was it Heisenberg?
*April 4, 2008*

**Physics**

An electron and a proton are traveling at the same speed. Which one has the longer wavelength?
*April 4, 2008*

**Physics**

In the photoelectric effect, what determines the number of ejected electrons?
*April 4, 2008*

**Physics**

In the photoelectric effect, what determines the kinetic energy of the ejected electrons?
*April 4, 2008*

**Physics**

Which laser beam carries more energy per photon? red, yellow, green, violet? I think red. Am I right?
*April 4, 2008*

**languages**

are there any free downloadable courses that I could teach myself Arabic with? I can't seem to find any good ones.
*March 28, 2008*

**math-patterns**

Each number adds a digit: Example 6,38,932,1087,12437,123456,1234567,12345678,123456789, ect... The pattern is not the number itself, but how many numbers in each... Good Luck!
*February 14, 2008*

**Chem**

1)Br- + MnO2 + 3H2O Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ 3Mn2+ + 9H2O + BrO3- 3)6Br- + MnO2 + 48H2O Mn2+ + 32H3O+ + 6BrO3- 4)4Br- + 3MnO2 + 18H2O 3Mn2+ + 12H3O+ + 4BrO3- 5)Br- + 3MnO2 + 3H3O+ 3Mn2+ + BrO3- + 3H2O I got the first one. Is that right?
*December 12, 2007*

**Chem**

Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the balanced equation for this reaction. 1)Br- + MnO2 + 3H2O --> Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ ---> 3Mn2+ + 9H2O + BrO3- 3)6Br- + MnO2 + ...
*December 12, 2007*

**Chem**

Calculate the Go for the oxidation of 5 moles of tin in the following balanced reaction. 16HCl + 2KMnO4 + 5Sn ---> 5SnCl2 + 2MnCl2 + 2KCl + 8H2O
*December 12, 2007*

**Is this how you derive the formula for arc length?**

For a smal change in x, dx: ds² = dx² + dy² ds = sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy² * dx²/dx²)] s = INTEGRAL of sqrt[(1 + dy² * 1/dx²)] dx s = INTEGRAL of sqrt...
*December 4, 2007*

**accounting**

what is the most important step in the acounting cycle
*December 1, 2007*

**Calc-Derivatives**

I asked this before and did not get a response so I am trying again. (Note, I didn't know how to type the symbol for pi) What is the derivative of: 2pi^2r^4 would it simply be 8pi^2r^3? I was thinking the 2pi^2 is simply the equivalent of a constant in front of the r^4 and...
*November 28, 2007*

**calc**

What is the derivative of: 2pi^2r^4 would it simply be 8pi^2r^3? I was thinking the 2pi^2 is simply the equivalent of a constant in front of the r^4 and so you would just use the power rule.
*November 28, 2007*

**Calc**

Can this be factored: 6/5x^1/5 - 12/5x^-4/5 I am trying to find the values for X which will make this equal to zero. My factoring looks like this but not sure it is right 6/5x^1/5(1-2x^-1) so I get X= 0 and X=2
*November 25, 2007*

**social studies**

who does John Hancock resemble, and how?
*September 30, 2007*

**Physics**

Can two equipotentials ever cross one another? Explain via analogy to a topographical map Can two equipotentials be tangent to one another? What is the analogous situation in the case of a topographical map? What is your thinking on this? I will be happy to critique your ...
*July 8, 2007*

**Physics**

For a resonance tube apparatus (open ended on one side) with a total tube length of 1.00 meter, on a day when the speed of sound is 340 m/s, how many resonance positions will be observed as the piston position is varied for a frequency of 500 Hz? and 1000 Hz? Use the n as the ...
*July 1, 2007*

**Physics**

Why should a tuning fork be set into oscillation by striking it with a soft rubber mallet rather than with a hard metal mallet? Striking it with a hard mallet excites higher order modes rather than mainly the fundamental. That is because a hard mallet impact causes steep ...
*July 1, 2007*

**Physics**

Does centripetal force acting on an object in uniform circular motion do work on the object? For work, force must be in the direction of movement. Please stop posting under differing names.
*June 18, 2007*

** chem expirement!**

You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of ...
*May 17, 2007*

**chem experiment:**

You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of ...
*May 17, 2007*

**Calc Help**

I need to find dq2/dpb and dqb/dpa qa=2500+(600/pb+2)-40pa qb=3000-100pb+(400/pa+5) a and b are subscripts.
*April 29, 2007*

**Calc Help**

Marginal Cost = 30sqroot(x+4) with fixed costs of $1000. Marginal Revenue = 900. find profit or loss from production and sale of 5 units. how many units will result in a max profit? what is the max profit? Can someone please help. Trying to review for my final and really stuck...
*April 29, 2007*

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