Tuesday
September 2, 2014

Posts by key


Total # Posts: 47

physics
A steel rod is 3cm in diameter at 25C. A brass ring has an interior diameter hole of 2.994cm at 25C. At what common temp will the ring just slide onto the rod? alpha(steel)- 11x10^-6 alpha(brass)= 19x10^-6
September 4, 2013

physics
An ideal gas, for which gamma=1.5, undergoes an adiabatic expansion in which its volume is doubled. if the initial temp if the gas is 27 C, what is the final temperature of the gas?
September 4, 2013

algebra
Two trains leave stations 50 miles apart at the same time heading toward one another on parallel tracks. Train A is traveling 20 miles an hour and Train B is traveling 30 miles an hour. They pass eachother in how many hour(s).
June 18, 2013

math
Are all quadratics of the form y = ax^2+bx +c and y = -ax^2+bx +c functions? Explain your answer.
May 6, 2013

budgeting
COLA raises are linked to
June 14, 2012

budgeting
Which one of the following statements best describes a budget "blind spot"? A. Too little money was set aside to cover an expense. B. This is an expense the person overlooked or did not account for when setting up the budget. C. This is an item that requires periodic...
June 14, 2012

chemistry
28
February 10, 2011

math
11 -3 1/2
December 2, 2010

geometry
Some irragation spray water in a circular pattern. you can adjust the nozzle to spray in certain directions. the nozzle in my diagram is set so it does not spray on the house. if the spray has a radius of 12 feet what is the approximate length of the arc that the spray creates?
December 1, 2010

Geography
read pages 401 to 403 in your book
November 28, 2009

ECG Help - Bio
isn't it 1Hz, because it's from peak to trough, which is not one cycle!
September 28, 2009

Romeo and Juliet Help (24 hours and no response)
what warning does the princes issue to the Capulet and Montagues?
March 13, 2009

math
use the quadratic formula to solve the equation: x^2+10x-10=0
January 4, 2009

math
solve the equation 3(x+2)^2-4=11
January 3, 2009

math
solve the equation (x-5)^2=10
January 2, 2009

math
is it -16
January 1, 2009

math
find the zeros of the function by rewriting the function in intercept form? y=81x^2-16
January 1, 2009

Business Ethics
Neka Kiser, vice president of operations for Mountain National Bank, has instructed the bank’s computer programmer to use a 365-day year to compute interest on depository accounts (payables). Neka also instructed the programmer to use a 360-day year to compute interest on...
November 22, 2008

nonfiction
YALL BE LIEIN
October 1, 2008

algerbra
7x
March 17, 2008

philosophy
what would john locke think about the sci-fi movie "total recall" He believed men were driven by greed. The villian in the movie was just as greedy as they come. http://en.wikipedia.org/wiki/John_Locke
May 7, 2007

chemistry
Do any of you think that spontaneous combustion is possible? If a reaction brings about an increase of entropy (increase in randomness) and also exodermic, then a reaction is spontaneous. Right? Yes, I think spontaneous combustion is possible. It happens. Yes, if delta H is ...
April 16, 2007

Chemistry
Is this correct? Thanks. What is the standard cell potential? Pb2+ ( aq ) + 2e „³ Pb (s) -0.13V Mn2+ ( aq ) + 2e „³ Mn (s) -1.19V Pb2+ ( aq ) + 2e „³ Pb (s) -0.13V Mn (s) „³ Mn2+ ( aq ) + 2e ¡V +1.19V The electrode potential for a ...
March 22, 2007

psychologgy
I am having trouble with this assignment. I dont want answers to all of these but if you could help me with one so i get an idea of the assignment. no chart needed just an example. pleeze. thanks Using a simple chart for display, create mnemonics for the following terms: ...
March 9, 2007

chem
PLEEEZE help name the type of reaction K + MgBr -> Not enough information is provided. And not magnesium bromide is MgBr2. Is this a solution phase or exactly how is the K metal added to the MgBr2? As DrBob has indicated, not all of the information has been provided. You ...
February 19, 2007

psychology
why is the Cognitive theory the most popular among contemporary therapists. I'm not sure what you mean by "popular." Very often therapists are relatively eclectic, using the best aspects of several theories rather than just one. It also depends on which cognitive...
February 15, 2007

chemistry
what are some the different types of chemical reactions that occur on a daily basis our lives? wouldnt there be many? eating, taking medications, would emotion be or cause chemical reaction? All of the above. Add breathing. Don't forget the cars we drive, the clothes we ...
February 14, 2007

chemistry check
please check Write the balanced equation, with the enthalpy component, for the rusting process, given that Hf for iron and oxygen is 0 and Hf for ferric oxide is -826 kJ/mol. 4 Fe (s) + 3 O2 (g) --------> 2 Fe2O3 (s) You need to add the heat one of three ways. 4 Fe (s) + 3 ...
February 8, 2007

chemistry
are these endothermic or exothermic? 2H2O2 (l) ¨ 2H2O(l) + O2(g) ∆H = -190 kj C(s) + H2O (g) ¨ CO (g) + H2 (g) ∆H = +113 A negative delta H means the heat is given up by the reaction. A + delta H means the heat is added to the reaction. thanks
February 5, 2007

chemistry check
What is the sum of the coefficients (including “1”) of the following reaction? Sodium sulfate + calcium hydroxide ??? Na2SO4 + Ca (OH)2 --> 2 NaOH + CaSO4 a. 4 b. 5 c. 6 d. 7 e. 9 the sum of coefficients are = 1 + 1 + 2 +1 = 5 Goodness, you add the digits well. ...
January 30, 2007

chemistry
i had a lab that combined 1/2 cup of H2O2 (118.3 ml) and 2 tsp of yeast. is the equation for the reaction 2H2O --> 2H2O + O2 what would the mass be for each product in the reation? Is the density of H2O2 1.4g/ml? Here is some interesting reading on this subject. As to the ...
January 29, 2007

chemistry
I was way off on the other problem. But I see how you got the answer. Last one...thanks i'm learning more here thn class What is the sum of the coefficients (including “1”) of the following reaction? Sodium sulfate + calcium hydroxide ??? Write the equation (...
January 29, 2007

chemistry
Could you explain this problem to me? What is the sum of the coefficients (including “1”) of the balanced equation? __CaCO3 + __NaF __ CaF2 + __Na2CO3 a.
January 29, 2007

chemistry
thanks DrB I got AgCl also Could you check this problem as well? If you start with .500 moles of NaF, how many moles of CaF will form? I got .250 that is correct as far as i know i got the same thing That's correct. Your answer is right. I can only assume you worked it ...
January 29, 2007

chemistry
Predict the precipitate that forms: HCl + AgNO3 --> ??? i dont know what the answer is but i think it is Cing04 AgCl. You need to learn the solubility rules. If you don't have a web site I can give you one. hey watz up can you help me with a question please? If you have...
January 29, 2007

chemistry help
If you start with 20.0 grams CaCO3, how many moles of CaCO3 do you have? mols = g/molar mass. Approximately 0.200 mols.
January 29, 2007

chemistry check
1. 48 KNO3+ _ C 12 H22O11-„³ ? CO2+ _ N2+ _ K2CO3+ _ H2O a. 12 b. 24 s c. 36 d. 48 The reaction is 48 KNO3 + 5 C12H22O11 --> 24 K2CO3 + 36 CO2 + 55 H2O + 24 N2 So the answer is C =36 2. 6 KNO3+ _ S + ? H2O„³ _ H2SO4+ _ N2+ _ K2SO4 a. 2 b. 4 c. 6 d. 8 The...
January 24, 2007

chemistry
could someone check my answers to see if they are right? Balance the following equation and give the value of the stoichiometric coefficient marked with a question mark. 6 KNO3+ _ S + ? H2O _ H2SO4+ _ N2+ _ K2SO4 answer:6KNO3 + 5S + 2H2O --> 3 K2SO4 + 3N2 + 2H2SO3 42 KMnO4...
January 24, 2007

chemistry help
i have come up with two answers but i am not sure which one is correct. please help. Balance the following equation and give the value of the stoichiometric coefficient marked with a question mark. 1. 48 KNO3+ 5C12 H22O11 ? CO2+ 24N2+ 24 K2CO3+55 H2O a.
January 24, 2007

help...chemistry
i am stumped on this. please help. Balance the following equation and give the value of the stoichiometric coefficient marked with a question mark. 48KNO3 + _ C12H22O11 ---> ? CO2 +_ N2 + _K2CO3 +_ H2O thanks I left the CO2 for you but it will balance. 48KNO3 + 5C12H22O11...
January 21, 2007

chemistry
Need Help Finishing: Purpose: • To observe a chemical reaction. Materials: • Vinegar (acetic acid, CH3COOH) • Baking soda (NaHCO3) • Measuring cups and spoons • Cup Procedure: 1. Place ½ cup of vinegar in the cup. 2. Add 1 tablespoon on baking ...
January 21, 2007

chemistry
thanks for any help with these translations into scientific notation: 1. magnesium ribbion is dropped into an aqueous solution of hydrochloric acid 2. a solid peice of copper is burned in pure oxygen 3. zinc carbonate is strongly heated in a crucible 4. calcium chloride is ...
January 19, 2007

chemistry
having trouble posting but will try again. translate the following verbal description into scientific notation. magnesium ribbon is burned in pure oxygen gas. thanks The reaction forms magnesium oxide (MgO). Se if you can write the balanced reaction.
January 19, 2007

chemistry
Translate the following verbal descriptions of reactions into scientific notation. Be on the lookout for diatomic molecules. 1.
January 19, 2007

chemistry
may i get some help with this.. Translate the following verbal descriptions of reactions into scientific notation. Be on the lookout for diatomic molecules. 1.
January 19, 2007

psychology
Are there ways to revise current IQ tests and improve them so they are not culturally biased? Here are a couple of very interesting sites that may give you some good ideas. www.psychpage.com/learning/library/intell/biased.html http://www.liberalartsandcrafts.net/contentcatalog...
January 11, 2007

psychology
What do the results of twins studies on IQ say about John Locke’s theory? (Broken Link Removed) Here are some quotes to assist you in this nature vs nurture debate. The last really answers your question. The others mainly point out the fallacies psychologists delude ...
January 11, 2007

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