Sunday
April 20, 2014

Posts by dave


Total # Posts: 599

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 f...

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

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...

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.

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?

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

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??

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...

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

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 ...

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 sp...

English rhymes/riddles
small parts of wild plants

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?

American History
thanks but i'm still lost...

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 ...

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 b...

crt 205
Wishful Thinking

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

algebra
how do you get that answer???

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

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...

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 a...

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 t...

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 ...

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,...

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 acc...

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 n...

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.

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 wate...

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? Thi...

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/

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...

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 litt...

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...

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: htt...

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 fo...

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 ...

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 examp...

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.

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?

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 underst...

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 eff...

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 favorit...

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??? =)

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:/...

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 w...

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

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 el...

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

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

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+On...

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.

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 ea...

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.

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 mi...

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 w...

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 ...

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

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

Science
Which of these statements regarding enzymes is FALSE?

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 incl...

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...

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 m...

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...

Physics/Math
dude, this problem is impossible

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 t...

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)/...

Geography
i need question 9 and 11 also volcanoes is 4 and tsunami is 12

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 ...

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 wa...

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...

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 th...

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...

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 &qu...

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

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....

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 life...

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.

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 thin...

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 life...

physics
8225 km

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 feat...

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.

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 import...

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 ri...

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 distil...

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...

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...

Chemistry HELP!!
Can you identify a metal if you know its density? Explain Do you think that determining the volumes of metal samples by measuring their dimensions and calculating would be more r less accurate than determining volumes by water displacement? Explain. Would measuring the dimensi...

Economics
#2 is A

1 question+chem!
#11) The information: An unidentified acid with a concentration of 1.0 mol/L has been given to you to identify. The acid appears in your data booklet on the Relative Strengths of Acids and Bases table. The following test results were recorded: 1. Methyl violet is yellow when a...

Chem.
10. Suggest how two very different variables could be manipulated to increase the percent yield of sulphur trioxide. The equation for the reaction follows. 2 SO2(g) + O2(g)>>> 2 SO3(g) + energy Ok, I really dont know this one. Can you please help? Thanks! You need to...

sociology
LOL wow Go AXIA!!! Funny but sad at the same time lol

"le Chat. Principle" #2
Hi, there are 5 questions and I was wondering if you could check them for me. Thanks! 3. The hypothetical equilibrium reaction represented by the equation that follows. QA(s) + 2 X(g)>>>Q(l) + X2A(g) + energy This reaction can be shifted to increase the yield of produ...

"le Chat. principle".
Hey, can you check this, this is regarding "le Chat. principle". Thanks! #1) The value of the equilibrium constant for the reaction H2CO3(aq) + energy >>> H2O(l) + CO2(g) can be changed by introducing a change to which component of the equation? My answer: I...

History
Has anyone read the book A People's History of the UNited States? if so, can you help me with a question about the first chapter? How does Zinn's story of first contact differ from your own prior knowledge of the story? I haven't read this text, but the reviews poi...

Chemistry
Hey, can you help me on this question: Question: A 2.3 kg iron object is placed in an oxygenated tank of 1.00 mol/L hydrochloric acid. What volume of hydrochloric acid would react to completely consume the iron object? My question: when I seperate the H and Cl, and make the eq...

chem. check
Can u please check these questions..thanks! Redox Stoichiometry 1.A 2.45g zinc metal strip is placed into an 2.3 x 10-1 mol/L solution of tin (II) bromide. If all the zinc and tin (II) bromide react, what was the volume of the solution. My answer: 8.62L is the volume of the so...

help me asap
hi I'm taking sat II lliterature test and i was wondering if you can give me a site where i can take a practice test online for free. Check these sites. http://www.collegeboard.com/student/testing/sat/lc_two/lit/format.html?lit http://testprep.sparknotes.com/testcenter/ap/...

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