Wednesday
September 17, 2014

Posts by dave


Total # Posts: 611

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

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

Chemistry
WHat are the structural formulas for glycerin, hexane, and ethanol. Do these structural formaulas support the solubility data obtained?? It is almost impossible to draw structural formulas on the computer. In line formulas may help. But you need to refine your question to ...
February 20, 2007

Chemistry
Based on the fact that calcium carbonate is an ionic compound, why is it insoluble in water???? Look up your solubility rules. I'm not really sure why, but I know my book states right off that Most sulfide, carbonate, and phosphate salts are only slightly soluble. Slightly...
February 18, 2007

Algebra II
Our current assignment is to find the LCM, Least Common Multiple of two polynomials. I think I'm doing it right but I'm not quite sure. For the first question: 2t^2+t-3, 2t^2+5t+3 I have 2t^2+t+3 as the LCM. Is this correct or can somebody step me through the correct ...
February 15, 2007

AP Chemistry
(a) What is the pH of a 2.0 molar solution of acetic acid. Ka of acetic acid = 1.8 x 10¯5 (b) A buffer solution is prepared by adding 0.10 liter of 2.0 molar acetic acid solution to 0.1 liter of a 1.0 molar sodium hydroxide solution. Compute the hydrogen ion concentration...
February 13, 2007

Physics/Math
dude, this problem is impossible
February 12, 2007

CHEMISTRY
When air pollution is high, ozone (O3) contents can reach 0.60 ppm (ie., .60 mol ozone per million mol air). How many molecules of ozone are present per liter of polluted air if the barometric pressure is 755 mm Hg and the temperature is 79 degrees F? I converted temperature ...
January 4, 2007

Pre-Calc
Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= tanx + secx My work so far: (sinx/cosx + 1/cosx + cosx/cosx)/(sinx/cos x - 1/cosx + cosx/cosx)= tanx + cosx (just working on the left side) ((sinx + 1 - cosx)/cosx)/((sinx - 1 + cosx)/cosx) ((sinx + 1 - cosx)/...
January 2, 2007

Geography
i need question 9 and 11 also volcanoes is 4 and tsunami is 12
January 2, 2007

Chemistry
I have a problem that I wasn't sure how to do, and I want to see if my reasoning behind getting the answer is correct. Question: If .0129 mol of N2O4 effuses through a pinhole in a certain amount of time, how much NO would effuse in that same amount of time under the same ...
January 1, 2007

Chemistry- partial pressures
A sample of gas collected over water at 42 degrees C occupies a volume of one liter. The wet gas has a pressure of .986 atm. The gas is dried and the dry gas occupies 1.04 L with a pressure of 1.00 atm at 90 degrees C. Using this information, calculate the vapor pressure of ...
January 1, 2007

Chem
Nitric acid can be prepared by bubbling dinitrogen pentoxide into water. N2O5(g) + H2O -> 2H+(aq) + 2NO3-(aq) a) How many moles of H+ are obtained when 1.50 L of N2O5 at 25 degrees C and 1.00 atm pressure is bubbled into water? b) The solution obtained in (a) after reaction...
January 1, 2007

English Essays
Can someone please find me essays describing ethos, pathos, logos, in Narrative of Frederick Douglas and Autobiography of Malcolm X? I would greatly appreciate it!!!!!!!!!! Thanks!!!!!!!!!!!! I assume that your assignment is to write essays about ethos, pathos, and logos in ...
December 27, 2006

Math
I have a practice question that I am stuck on and need help. A certain insect pest has infested a cornfield. The pests are spreading through the field in a circular pattern at the rate of 3m/day. When the radius of the infested area is 70m. How fast is the area of the infested...
December 3, 2006

Chemistry
I was not the person who wrote that question last night? Chemistry - DrBob222, Wednesday, November 15, 2006 at 7:24pm Yes, it is possible in some cases. For example, CoCl2 is blue in the unhydrated form and pink in the hydrated form. As a kid, I used a water color brush to &...
November 16, 2006

science
a satellite is in geosynchronous orbit 36,000 km above earth. describe how you would fond the speed of this satellite.\ http://en.wikipedia.org/wiki/Geosynchronous_orbit
October 28, 2006

science
I need help with this problem:you live in the middle of a block that is square and one mile around. there is a stop sign on each corner. if your carcan only accelerate and brake at one meter per second per second, describe how you would get around the block in the fastest way...
October 28, 2006

society
What are the most significant similarities between the Chinese American and Japanese American [cultural] experiences? What are the differences? • Choose from any of the following topics when considering similarities and differences: o Level of assimilation o Relative ...
October 19, 2006

question
What are the most significant similarities between the Chinese American and Japanese American? when it comes to thePursuit of education? Education is a very high priority in all Oriental society.
October 19, 2006

CULTURAL DIVERSITY
If someone made the below statements to you, how would you explain that the statements are misconceptions? 1. Asian Americans and Pacific Islanders are a model minority. 2. Asian Americans and Pacific Islanders belong to a single "Asian American" culture. Do you ...
October 19, 2006

CULTURAL DIVERSITY
What are the most significant similarities between the Chinese American and Japanese American [cultural] experiences? What are the differences? • Choose from any of the following topics when considering similarities and differences: o Level of assimilation o Relative ...
October 18, 2006

physics
8225 km
October 16, 2006

grammar
Rewrite the following sentences, focusing on the grammar area specified in the left column. To enter your answer, click next to the number and begin typing. If the sentence is already correct, write No Change. Punctuation within Sentences—Colon The book had some nice ...
October 10, 2006

Business Report Writing
Have you ever seen a communication with poor formatting that made it difficult to understand? Did the message lose some of its desired effect due to the problems? Yes I have. Yes it did.
October 10, 2006

English
WHy is the importance of being open to new ideas? This is a very vague question, but this is my thought: The question of the importance of being is open to new ideas because it is an unsolvable question. Being unsolvable, new perspectives will always come into play. The ...
October 7, 2006

Accounting
I'll start with the first part of my problem. This is a long assignment since it is a weekend one. Part 1: Incomplete Comparative Balance Sheet. The percentage of Increases/decreases are to the side. And Accumulated Depreciation is listed twice. I'm assuming that is ...
October 1, 2006

Chemistry
How might one separate a mixture of water and salt? A solution of water and salt may be separated, if you don't want the water, by allowing the water to evaporate which will leave the salt crystals behind. If you want the water AND the salt, you may separate them by ...
September 9, 2006

History help!!!!!!!!
Why did the colonists react to the Coercive Acts with boycotts and convening the First Continental COngresss? in 1764, the British Parliament passed the Sugar Act. Many of the colonists were unwilling to pay tax which was imposed - this is what started everything. This was the...
September 3, 2006

microeconomics
Ok, if anyone is able to help me within the next 12 hours or so, that would be wonderful! I think I am going about this problem correctly -- I am not looking for someone to solve this problem for me, but for someone to tell me if I am doing it right... You can see this chapter...
August 31, 2006

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