Monday
December 22, 2014

Posts by dave


Total # Posts: 639

Chemistry-Solubility Product
Why does effervescence when the Group 2 anion precipitate is acidified imply the presence of (CO3)2- ?
April 12, 2009

math
the incompetent bullfighter was by gordan bluddy.
March 30, 2009

math
The acceleration of a particle at a time t moving along the x-axis is give by: a(t) = 4e^(2t). At the instant when t=0, the particle is at the point x=2, moving with velocity v(t)=-2. Find the position of the particle at t=1/2 if you could show me how to get that please
February 23, 2009

spanish
what is wrong with saying llegamos con mi mama en el aeropuerto? should the en el be del?
February 17, 2009

chemistry
a compound made in the first part of an experiment, [Co(NH3)5Cl]Cl2 appeared to be a dark brown/orange/purple color. This product was then used as a reactant to synthesize [Co(NH3)5ONO], which was a red color. how do you account for the differences in color between these two?
February 17, 2009

chemistry
what ions would for from this compound in an aqueous solution? how would i write the equation that forms these ions? [Co(NH3)5Cl]Cl2
February 16, 2009

Physics
Do you go to Connections Academy?
January 27, 2009

9th grade
ms.sue whats the answer?to my question? Thanks,Daves dad
January 7, 2009

9th grade
using only 15 of these letters,tlpuytsiaaganbrnlrog,what do you call a female bug that floats?
January 7, 2009

9th grade sience
what do you call a female bug that floats?
January 7, 2009

math
blank times blank equals 140 what is the two blanks
January 5, 2009

precalculus
show that (-1,1), (9,4), (20,6) and (10,1) are the vertices of a rhombus and then find the area of this rhombus?
December 16, 2008

9th grade : Algebra
how do you solve linears
December 2, 2008

math
lula wants to round 76.24491 to the nearest hundreth. how do you do it?
November 26, 2008

chemistry
2 Cl(g) --> Cl2(g) exo-on H2O(l) --> H2O(g) endo-by 2 H2(g) + O2(g) --> 2 H2O(l) exo-on 2 Li(s) + H2O(l) --> 2 LiOH(aq) + H2(g) endo-by 3 NaN3(s) --> Na3N(s) + 4 N2(g)endo-by
November 16, 2008

math
WHAT IS THE RECIPROCAL OF 5 3/4
November 15, 2008

business
why must a business manage information as a resource?
November 11, 2008

5th grade
draw some quadrilaterals. one fifth is blue. one half is yellow.
October 28, 2008

AP World History
is this good, The Han and Roman Empire were important empires during the time of their existence. The Han Empire began around 206 B.C.E and ended 220 C.E. The Roman Empire began around 27 B.C.E. Throughout their existence, Han China saw technology as an important and ...
October 14, 2008

AP World History
i need help!
October 14, 2008

Math -5th Grade
Using on 3, 11, 21, and 24 only once, and using any combination of divide, multiply, addition, and subtraction, what formula can be created to equal 24?
October 6, 2008

acton high
how do you detect the presence of co2 in a liquid
September 24, 2008

Macroeconomics
Can someone check this for me? 1. Where in the US National Income and Product Accounts and the circular flow of expenditure and income do new home sales appear? ANSWER: I said they appear with money going from the households to the goods and services market. 2. How does a fall...
September 11, 2008

MATH
Suppose that g(X)=f(cx). Show from the definition that g'(x)=cf'(cx)
September 1, 2008

Calculus
Find (fg)'(1) if f(1)=1, g(1)=2,f'(1)=3, g'(1)=-3
August 31, 2008

Axia College
I can not believe the amount of errors on this page with spelling etc. There is no problems getting jobs as long as you know your stuff. People usually gripe about the school because they cant handle not having a teacher around. If you are self-paced and do not need constant ...
August 7, 2008

help math
a partial moves along the x-axis so that its velocity at time t, for 0< = t = < 6, is given by a differentiable function v whose graph is shown above. The velocity is 0 at t=0, t=5, and the graph has horizontal tangents at t=4. the areas of the regions bounded by the t-...
May 20, 2008

calc help
t= hours 0 1 3 4 7 8 9 l(t) people 120 156 176 126 150 80 0 concert tickets went on sale at noon (t=0) and were sold out within 9 hours. the number of people waiting in line to purchase tickets at time t is modeled by a twice-differentiable function L for 0< = 0 < = 9. ...
May 20, 2008

government
Why did the South choose to return to a Confederacy despite the failures of this governmental form in the late 18th Century?
May 14, 2008

math
How is doing operations (adding, subtracting, multiplying, and dividing) with rational expressions similar to or different from doing operations with fractions? Can understanding how to work with one kind of problem help understand how to work another type? When might you use ...
April 3, 2008

physics/chem
n Fig. 21-41, three identical conducting spheres initially have the following charges: sphere A, 7Q; sphere B, -8Q; and sphere C, 0. Spheres A and B are fixed in place, with a center-to-center separation that is much larger than the spheres. Two experiments are conducted. In ...
March 31, 2008

physics/chem
(a) What equal positive charges (in Coulombs) would have to be placed on two celestial objects with masses 9.40 x 1027 and 1.99 x 1022 kg to neutralize their gravitational attraction? (b) What mass of hydrogen would be needed to provide the positive charge calculated in (a)? I...
March 31, 2008

physics/chem
Calculate the number of coulombs of positive charge in 261 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.)
March 31, 2008

geography
Thanks for all the help. I realize this isn't a site for doing other's homework, but this is not for the purpose of a homework assignment, but for creating a map of East Asia. I am merely trying to source outside help due to time constraints.
March 26, 2008

geography
Also the principal roadways; airports, harbors; and railroads in each region would be very helpful too.
March 26, 2008

geography
Need to know the principal rivers, mountains, and bodies of salt and fresh waters within and around China, Taiwan, Japan, North and South Korea. Thanks.
March 26, 2008

science
Describe (with calculations) how you prepare 1.00 L of 0.750 M barium hydroxide solution starting with Solid barium hydroxide
March 8, 2008

English
chameleon,
February 28, 2008

Health Project
Could someone help me find a medical supply company presentation which involves information about the products, jobs, services, etc available. I would greatly appreciate that!! Thanks
February 17, 2008

Access Database - computers
I have to make a database to track university apartments in access. I am stuck trying to decide what type of tables and field names i should have. would it make sense to have a table for students including first, last names, address, city, postal code, telephone number table ...
February 10, 2008

Chemistry
don't forget when finding the mass for the volume equation you must add the mass of your solute, citric acid. once you find the total mass, then divide by the density to give you the total volume. Then moles of citric acid divided by your total volume gives you the ...
February 7, 2008

math
how do you find the reference angle of csc,sec, cot? for example: csc theta= 2 times square root of 3 / 2
February 4, 2008

chemistry
The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 300C , the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is...
February 4, 2008

chemistry
When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -9.500 x 10^3 K. According to the Clausius Clapeyron equation, Hvap is kJ/mol.
February 4, 2008

Microecon
If you are given this function: P=1000-40Q where P=price and Q=sales..... How do you get the price elasticity of demand at a price that is $500? At what price, if any is the price elasticity of demand equal to one?
January 23, 2008

English
It takes someone with a really big heart to give to our charity, and you seem like someone who cares more than most
January 21, 2008

algebra
well i redid it and i got this: = x^2 + 4x + 4 - 2x - 4 - 2^2 - 4 / 2 = x^2 + 2x / x divide the x and i get "x+2" is it correct??
January 13, 2008

algebra
wait, i mistyped. it should be: if f(x) = x^2 - 2x, find f(x+2) - f(2) / x divided by x, not 2. sorry...
January 13, 2008

algebra
if f(x) = x^2 - 2x, find f(x+2) - f(2) / 2 the answer is: x+2 but l got: x^2 - 2x - 8 = 0 which is x = 4 or x = -2
January 13, 2008

geography
Sammy goes out to play. His Mother tells him to be home by 5:00. Sammy is almost an hour late, but he has an excuse. He says that he got lost. He tells his mother that when he checked his compasd, it was pointing to the west, so he followed a path in that direction, but still ...
November 28, 2007

Math For Business
A man has decided to invest at most $90,000 in securities in the form of corporate stocks. He has three options: blue chip stocks he assumes will yield a 6% return, growth stocks @ 12%, and speculative stocks @ 20%. No more than 25% of his investment should be in growth and ...
November 19, 2007

English rhymes/riddles
small parts of wild plants
November 15, 2007

Calculus
find the equation of a line tangent to the graph of y = x / (square root of 5x^s +4), at x = 1. am i suppose to take the derivative? if so, then what else?
November 13, 2007

American History
thanks but i'm still lost...
November 11, 2007

American History
Hi, I need help on answering this question: To what extent did foreign affairs shape American domestic politics in the 1790s? -- I know about the competing visions between Hamilton and Jefferson as well as the British and the French... But i'm lost. i don't know which ...
November 11, 2007

calculus : related rates
a balloon rises at a rate of 3 meters per second from a point on the ground 30 meters from an observer. find the rate of change of the angle of elevation of the balloon from the observer when the balloon is 30 meters above the ground... so i drew a small picture depicting it ...
November 5, 2007

crt 205
Wishful Thinking
October 28, 2007

algebra
how do I work this? (-4x^12y^7)^2 (2x^-3y^-2)^2 divided by (5x^-3y^10)^-1 i need step by step help
October 14, 2007

algebra
how do you get that answer???
October 14, 2007

algebra
(2x^2y^-4z^-5)^3 How is the answer 8x^6 _____ y^12z^15
October 14, 2007

Science
What is the mathematical calculations that lead to the theory of Dark matter or Dark energy? What is the calculation for energy in the universe? What is the calculation for matter in the universe? What is the discrepancy between the two calculations? Please note that we don&#...
June 25, 2007

Science
Prior to the detonation of the first atomic bomb, had the scientist been able to prove by theory that the reaction would stop? I assume they did considering they continued with the test. If not, how was Bethe able to calculate the yield of the explosion? It stops because the ...
June 25, 2007

physcial science
Why is a nail attracted to either pole of a magnet, but another magnet is attracted to only one of the poles? Did you post this twice? Please review my answer posted yesterday It looks like my answer to this same question by "jan" did not get posted. It was related ...
June 25, 2007

physcial science
Does a light bulb glow because.... a) there is burning inside b) an electric current glows c) the filament is hot d) a very small current is flowing Wouldn't you think it was because the filament was hot? Of course, a very small current also CAN make a filament hot if the ...
June 25, 2007

physcial science
Does a 5000-watt heater use twice the energy of a 2500-watt heater. What calculation do I need to do to compare these and answer the question? It does while it is on. But if it is controlled by a thermostat, it needs to be on only half as long to maintain the same temperature...
June 25, 2007

physcial science
How do I calculate the orbital velocity of a satellite that is 400 miles above the earth? Set the centripetal acceleration V^2/(R+h) equal to the gravitational acceleration, g * [R/(R+h)]^2 Then solve for V R is the earth's radius and h is the 400 mile height. g is the ...
June 25, 2007

Economics
If Mary takes money from her savings account and buys a T-bond from Jody with that money, it's: A. An expansionary fiscal policy. B. An example of contractionary monetary policy. C. An example of expansionary monetary policy D. An example of neutral (neither expansionary ...
June 24, 2007

physcial science
When a thermometer is placed in a beaker of hot water, WHY does the mercury level DROP, then rise? See my answer below to the same question.
June 22, 2007

physical science
When a thermometer is placed in a beaker of hot water, why does the mercury level drop, rise? The mercury expands when heated and that forces it from the bulb at the base of the thermometer higher into the capillary. But Why does the mercury Drop First , then rise? If the ...
June 22, 2007

Economics
Will the aggregate quantity of goods and services demanded become more sensitive or less sensitive to changes in the price level if an economy becomes closed (that is, as foreign trade disappears)? In terms of the AD/AS diagram, will the AD curve become steeper or flatter? ...
June 18, 2007

Purchasing Power of Income/ Economy
We use the _________ to determine the purchasing power of income. A. Interest rate. B. Real GDP. C. CPI. D. GDP. E. None of the above. Check this site for your answer. http://www.bls.gov/cpi/
June 14, 2007

Economics
Which of the following statements would come from someone classified as unemployed? A. I'm not working. I had three interviews this week, and I'm trying to find a job. B. I haven't had a job in a year, and I stopped looking for a job nine months ago. C. I'm not...
June 13, 2007

Economics
The biggest disadvantage in a command economy is: A. market forces determine production decisions. B. the lack of incentive for individuals. C. there isn't enough money to go around. D. there's no government intervention. E. it's run by a central planner. Do a ...
June 5, 2007

Economics
Its difficult to meet the requirements of ceteris paribus when studying a relationship between unemployment and inflation. Is this true or false??? True; When studying the relationship between unemployment and inflation, one must look at empirical, national economic data; data...
June 4, 2007

physiology help
why do fetal pigs have sensory papillae for bitter taste on the tongue? i have no idea. maybe so they won't eat something bad? Since this is not my area of expertise, I searched Google under the key words "bitter taste function" to get these possible sources: ...
May 29, 2007

please help me correct
i have to write a project about amy project. i'll write for what i am trying to say but i hope you can help me put it in a better, organized sentence. our project is about flying paper airplanes outdoors and it was windy and i want to explain why it's a disadvantage ...
May 24, 2007

speech help
i am giving a speech tomorrow on my persuasive speech on why i think music devices should be allowed in school as long as students follow some rules. and i was wondering if you have some opening sentences i can start with? I just don't want to say: I'm doing my speech ...
May 22, 2007

biomedical engineering
my major for college is biomedical engineering and i was looking athe salaries and they were around 50K to 80K. and i was wondering if there is a highest level you can get to by doing biomedical engineering where the salary increases to 100 thousands dollars or more. For ...
May 22, 2007

please read over my law
i'm supposed to write a law for abortion for my government class. And can you please read this over and give me any advice on how to make it more formal.
May 21, 2007

Algebra
Find the GCF for each of the following groups of numbers. 36, 54, and 180 Find the LCM for each of the following groups of numbers. Use whichever method you wish. 8, 15, and 20 can anyone IM me or email how to SIMJPLIFY RADICAL EXPRESSIONS please?
May 20, 2007

Chemistry
Explain the significance of positive and negative values for each thermodynamic quantity in the free energy equation. (enthalpy change, entropy change, and free energy change) I think this is something you can find in your text/notes. If not, explain what you don't ...
May 14, 2007

correction 2
Listening to music devices at school has negative stuff, but also postive stuff..... i will have add more and make it look like a complete organized sentence but what can i say instead of stuff. How about: Listening to music devices at school has both negative and positive ...
May 9, 2007

correction
One of people’s favorite hobbies is to listen to music. is there another word to say for people. it sounds too informal for an essay. Many people have a hobby of listening to music. The favorite hobby of many people is to listen to music. Listening to music is the ...
May 9, 2007

vocabulary help
growth-oriented: i asked my dad for help in my english assignment and he gave me this word but can someone put this in simple english please. growth oreinted meaning working in company that shows progess, i guess but a better word. ambitious??? =)
April 30, 2007

History
Could someone please find me a website that has great information on Business enterprise in America so I can make a timeline on it. Specific dates that I need are 1906, 1913, 1914 , 1930, 1939. I would greatly appreciate it. This site seems to have the most information. http...
April 29, 2007

History Essay
Can someone find me an example essay that deals with the following question. I am having trouble finding one. " TO what extent did events of the 1890s foreshadow events of the 1990s?" I just need an example so I can use it to get an idea of what exactly to write. I ...
April 23, 2007

History
To what extent did events of the 1890s foreshadow events of the 1990s in the United States?? John or Dave or whoever (same IP address): Your question has already been addressed: http://www.jiskha.com/display.cgi?id=1177369579
April 23, 2007

Chemistry
ELement A has a valence electronic structure of ns2np1. Element B has the valence electronic structure of ns2np5. Write a formula for the compound that would be formed from elements A and B. Element A has three electrons to lose to make the last shell eight. Element B has 1 ...
April 19, 2007

Physics
WHat happens to a pendulum's kinetic energy when it stops moving??? at the top? It has transformed to gravitaional potential energy.
April 19, 2007

Chemistry
Explain why acetic acid has four hydrogens, but is a monoprotic acid. Answered above under another name (John).
April 1, 2007

English Essay
CAn someone please find an analytical essay on David Sedaris' "ME Talk Pretty One Day". I would greatly appreciate it. You should be able to find something useful in this collection of sites: http://www.google.com/search?hl=en&ie=ISO-8859-1&q=%22ME+Talk+Pretty+...
March 26, 2007

Chemistry
What do strong electrolytes, weak electrolytes, and nonelectrolytes have in common? Severl things, I am sure, but one that comes to mind is that all are composed of cations and anions. That may not fit into your situation, however.
March 6, 2007

Chemistry
Would a substance that does not form hydrogen bonds have a high or low surface tension? What about vapor pressure, specific heat,heat of vaporization or boiling point? It requires extra energy to break hydrogen bonds so a substance that does not form H bonding can evaporate ...
March 6, 2007

Science
What is the ratio of phenotypes in the offspring produced by the cross Aa x Aa, assuming complete dominance for the trait? a. 100% dominant (D) b. 100% recessive (R) c. 25% D, 75% R d. 50% D, 50% R e. 75% D, 25% R One gets AA, Aa, aA, aa so three of the four has a dominate A.
March 5, 2007

Science
List the three main steps of aerobic cellular respiration. Which of these steps yields (by far) the most ATP? Here are two: Step One: Glucose enters the cell (insulin) and is split into 2 smaller 3 Carbon atoms called pyruvate. Total yield - 2 ATP Step Two: Pyruvate goes to ...
February 26, 2007

Science
When oxygen is present a. most cells utilize aerobic cellular respiration. b. most animal cells will carry on fermentation and produce lactic acid. c. most bacteria and yeasts carry on fermentation. d. two ATP molecules are produced for each glucose molecule. e. most animals ...
February 26, 2007

Science
Most reactions in the body occur too slowly on their own to sustain life. This is because: a. all reactions in the body are endergonic. b. many reactions require large inputs of activation energy. c. no catalysts are present in body cells. d. most biological catalysts are not ...
February 26, 2007

Science
During the process of photosynthesis, solar energy is converted into: a. chemical energy. b. heat energy. c. thermal energy. d. mechanical energy. e. nuclear energy. a
February 26, 2007

Science
What structural feature of a leaf allows CO2 from the air to enter the leaf? stomata http://evolution.berkeley.edu/evolibrary/images/interviews/stoma_diagram.gif
February 26, 2007

Science
Which of these statements regarding enzymes is FALSE?
February 26, 2007

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | Next>>

Search
Members