Total # Posts: 760
A tank in the shape of an inverted right circular cone has height $ 10$ meters and radius $ 8$ meters. It is filled with $ 6$ meters of hot chocolate. Find the work required to empty the tank by pumping the hot chocolate over the top of the tank. Note: the density of hot ...
February 14, 2008
Consider the differential equation: (du/dt)=-u^2(t^3-t) a) Find the general solution to the above differential equation. (Write the answer in a form such that its numerator is 1 and its integration constant is C). u=? b) Find the particular solution of the above differential ...
February 5, 2008
How do I algebraically find the x-intercepts for this equation y = x^3 - 3x^2 + 3. I know I need to plug in y = 0 to solve for x. x^3 - 3x^2 + 3 = 0 But where do I go from there? I don't think I can factor, and I don't think I can use the quadratic formula.
December 8, 2007
I'm tutoring someone 1st year arts math and they have been given this difficult question that I cannot mind boggel. It goes as follows: There are 6 couples at a party. Each can shake another persons hand once, but they can never shake their spouses hand. At the end of the ...
December 1, 2007
In alcohol fermentation, yeast converts glucose to ethanol and carbon dioxide C6H1206 -----> 2C2H5OH + 2CO2 If 5.97 g of clucose are reacted and 1.44 L of CO2 gas are collected at 293 K and .984 atm, what is the percent yield of the reaction?
October 31, 2007
physics- what did i do wrong
If the bus is 100 meters ahead of the car and the bus is travling at 65 km/hr and the car at 78km/hr, how long will it take the car to catch the bus? I used the following formula, but was informed my answer was wrong. 100m + (t) 65km/hr = 0 + (t)78km/hr and solved for (t). t...
August 29, 2007
construct a nondiagonal 2 x 2 matrix that is diagonalizable but not invertible. Just write down a diagonal matrix with one zero on the diagonal and then apply an orthogonal transformation. E.g. if you start with the matrix: A = [1 ,0 0,1] And take the orthogonal transformation...
July 12, 2007
the lim [as x goes to infinity] (.25)^x =0?? Yes, the limit is zero. The more times you multiply a number by 0.25 (which is what is happening when x goes to infinity), the smaller is the result.
July 11, 2007
Wallis's method of tangents
consider the curve defined by the equation y=a(x^2)+bx+c. Take a point(h,k) on the curve. use Wallis's method of tangents to show that the slope of the line tangent to this curve at the point(h,k) will be m= 2ah+b. have to prove this for tow cases: a>0 and a<0. Thank...
May 21, 2007
Cod+ H20 <==> HCod+ OH- 0.002M x M x M 0.002-x +x +x Kb=(HCod)(OH)/(Cod)=x^2/(0.002-x) 8.33x 10^-7=x^2/(0.002-x) x=4.08x 10^-5 (theres [HCod]) pOH= PKb + log (HB/B-) pOH= -log(8.33x 10^-7) + log(4.08x10^-5/0.002) = 4.38 POH + pH = 14 : 14- pOH = pH 14-4.38= 9.62
April 28, 2007
I thinks i got the problem right this time P=MR=$750 TC =2,500,000+500q+0.005Q^2 (squared) Mc =500+0.01Q Calculate profit maximizing level Calculate the company's optimal profit and optimal profit as a percentage of sales revenue Can anyone help here I am lost
April 6, 2007
P=MR+$750 TC =2,500,000+500q+0.005Q^2 (squared) Mc =500+0.01Q Calculate profit maximizing level Calculate the company's optimal profit and optimal profit as a percentage of sales revenue Can anyone help here I am lost
April 6, 2007
Profit Maximation question help P=MR+$750 TC =2500000+500q+0.00Q squared Mc =500+0.01Q Calculate profit maximizing level Calculate the company's optimal profit and optimal profit as a percentage of sales revenue Can anyone help here I am lost
April 6, 2007
Please help, I am so bored by my science lesson that I can barely focus. I read the lesson, and 5 seconds later I don't even remember what I just read. Any ideas on somehow making the Atmosphere and Solar Effects more interesting? I like history a thousand times better. ...
April 2, 2007
Find Ó x for the following set of numbers 2, 3, 5, 6, 8, 9, 11. If I knew what that funny looking symbol repersents I may be able to do the problem. Can someone explain please. Ok I think I have the answer now. All that symbol means is the mean. The answer would be 6.
March 26, 2007
I am getting ready to start an Algebra class for the first time and I was wondering what challenges people have with learning and using algebra concepts. Also what are the best ways to over come math anxiety? The best way? Learn the language of algebra.
March 20, 2007
Just a question
Is there such thing as a personologists? Yes, there are people who profess to be able to deduce people's personality from their facial behavior and body language. They seem to have coined the word and created a profession with that name, even though it is not in most ...
March 16, 2007
Will someone please show me how to do this problem. I have to write this ratios in simplest form. The ratio of 5 3/5 to 2 1/10. Change each of your mixed fractions to an improper fraction, then divide the first by the second. Remember to divide fraction #1 by fraction #2, you ...
February 4, 2007
I am having a difficult time calculating rates and unit prices. Can someone describe a simple process for using rates and unit prices that will help me understand these concepts? I searched Google under the key words "rates 'unit prices'" to get these ...
February 2, 2007
Can someone help me think of physical, environmental, and social factors that might affect criminal behavior. Any websites would be greatly appreciated. http://www.google.com/search?q=factors+criminal+behavior&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7...
January 30, 2007
Can someone explain rational choice theory to me. How is criminal behavior explained according to the rational choice theory? It is explained here well: http://en.wikipedia.org/wiki/Rational_choice_theory Look at the (unrealistic) assumptions about the world in that document. ...
January 23, 2007
Is this true Dispersion forces generally increase in strength as the number of electrons in a molecule increases. The number of electrons can only increase if more atoms are added to the molecule. The molecule has to stay electrically neutral. Dispersion forces are of greater ...
January 9, 2007
What is a polyatomic ion? A polyatomic ion is an ion composed of more than one kind of atom. For example, the hydrogen carbonate ion, HCO3^- (also called bicarbonate), ammonium ion (NH4^+), oxalate ion (C2O4^-2), phosphate ion (PO4^-3), sulfate ion (SO4^-2), sulfite (SO3^-2), ...
January 7, 2007
HELP,HELP,HELP,HELP How can you tell that cobalt(II) iodide is binary ionic compound formed by a transition metal with more than ionic charge? Thanx in Advance form jeff Cobalt(II) chloride tells you it is binary (composed of two different atoms), cobalt and iodine; compare ...
January 5, 2007
When water mixes with carbon dioxide in the air, what is formed? H2O + CO2 --> H2CO3 carbonic acid I dont think this is correct because there is no aid in co2. It just ends up to be CO2 in liquid form. Basically water with air is carbonated water. that is definitely correct...
December 7, 2006
In the banquet scence (Act III Scene iv), what complaint does Macbeth make about murdered men? I read it 10x through and found various complaints, but can't pinpoint which one. If he ignored his father's words,he would repent for it
November 23, 2006
Here is a prompt: Both Thomas Jefferson and Andrew Jackson were promoted as champions of the "common man". By looking at the long careers of both men it is quite obvious that only Thomas Jefferson truly lived up to this title. To what extent is this true? I am ...
November 14, 2006
at one point in time native americans were called Marginal Americans does anyone know why? Please help Thank you for using the Jiskha Homework Help Forum. The term "Marginal Americans" refers to those considered outsiders: ethnic minorities, the poor, the disabled, ...
September 29, 2006
Four roommates are planning to spend the weekend in their dorm room watching old movies, and they are debating how many to watch. Here is their willingness to pay for each film: Orson Alfred Woody Ingmar Frist film 7 5 3 2 Second film 6 4 2 1 Third film 5 3 1 0 Fourth film 4 2...
September 29, 2006
Just a fun question for you to answer. Consider the choices of native Americans who decide to stay on their tribe's native land and those who consider to relocate to a city. If you were presented with this decision, which would you chose and why? I would chose to leave the...
September 28, 2006