Questions Asked on
April 26, 2008

science
if it takes 31,500 joules of heat to warm 750g of water, what was the temperature change? My answer: Q = (M) (DeltaT) (c) Delta T=Q Delta T = 31,500J  750gx 1.0cal/gCo Delta T = 42oC
asked by sam 
Chemistry
A solution of I2 was standardized with ascorbic acid. Using a 0.1000g sample of pure ascorbic acid (C6H8C6), 25.32 ml of I2 were required to reach the starch end point. What is the molarity of the iodine solution? Please check to see if I did this right:
asked by Ramey 
math
There are 8 singers competing at a talent show. In how many different orders can the singer appear?
asked by kevin 
Biology12
Can someone please explain: Why are noncoding regions of DNA more discriminating than coding regions? I forgot my textbook at school, and the internet is not providing me with a detailed enough explanation. Thanks.
asked by Biology 
algebra
a chemist needs 10 liters of a 25% acid solution. the solution is to be mixed from three solutions whose acid concentrations are 10% 20% 50% how may liters of each solution should the chmist use to satisfy the following? a use as little as possible of the
asked by sandy 
physicsrepost
An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^13W/M^2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 8.5nn and the light has a wavelength of
asked by Stephy 
physics
Compressed air can be pumped underground into huge caverns as a form of energy storage. The volume of a cavern is 5.60 105 m3, and the pressure of the air in it is 8.40 106 Pa. Assume that air is a diatomic ideal gas whose internal energy U is given by U =
asked by Karen 
12 Biology
With regards to RFLPs, why are noncoding regions of DNA more discriminating than coding regions?
asked by Biology:Repost 
macroeconomics
Why do we consider a businesscycle expansion different from longrun economic growth? Why do we care about the size of the longrun growth rate of real GDP versus the size of the growth rate of the population?
asked by smeffy 
physics
A mass of 135 g of an element is known to contain 30.1 1023 atoms. What is the element? hydrogen oxyden aluminum carbon Is it aluminum?
asked by Sophia 
ghost in city hall
Hello all. Does anyone have a scanned copy of "ghost in city hall" worksheet? It is a math worksheet. Thank you, Sandy
asked by sandy 
science
a car of mass 1360 kg descends from a hill of height 86 m at a constant speed of 20 km/h. assuming that all the potential/kinetic energy of the car goes into heat in the brakes, find the rise in temperature of the brakes (use the heat capacity (C) of the
asked by kelsee 
math
Hannah had dinner at her favorite restaurant. If the sales rate is 4% and the sales tax on the meal came to $1.25, what was the total cost of the meal, including sales tax and a 20% tip?
asked by kevin 
physics
A system undergoes a twostep process. In the first step, the internal energy of the system increases by 368 J when 144 J of work is done on the system. In the second step, the internal energy of the system increases by 24 J when 248 J of work is done on
asked by Will 
Chemistry
Sulfuric acid/ Lead Battery: the electrodes for the battery are composed of Pb(s), PbO2, and/or PbSO4. What are the half reaction occuring at each electrode? include electrolysis of water: Process Anode/Cathode Initial Charging: Discharging Recharging
asked by sara 
chemistry
a sample of air has a volume of 140.0 mL a 67 degrees C. at what temperature would its volume be 50.0 mL at constant pressure/
asked by Gion 
Physics
Background: A monochromatic laser is exciting hydrogen atoms from the n=2 to state to the n=5 state. Question: What is the shortest wavelength observed? I believe that it will be from n=5 to n=4, but I am not sure what equation to use or how to use the n
asked by Christina 
chem
What is the pH of a solution prepared by diluting 25.00mL of 0.020M barium hydroxide to a volume of 100.00mL?
asked by Ginger 
physics
A system does 196 J of work on its environment and gains 40 J of heat in the process. (a) What is the change in the internal energy of the system? J (b) What is the change in the internal energy of the environment? J I thought the answer would be +40 for
asked by Will 
chemistry
In what ways does the manufacture of a Hybris hybrid powered car use petroleum as a fuel?
asked by lisa 
French
How do you pronounce "Allonsy", I know the how to pronounce the allons part, but not they y after it.
asked by Nichole 
Physics
The first and second resonant lengths of an air column that is closed at one end are 15.5 cm and 45.5 cm, respectively. What is the best value for the wavelength?
asked by Marty 
AP PHYSICS
An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^13W/M^2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 8.5nn and the light has a wavelength of
asked by Stephy 
Math
Solve the following equation for A : 2A/3 = 8 + 4A
asked by Irene 
paper on horsemen arena in lexington,KY
I'm writing a paper on the Lexington horsemen arena in lexington,KY I'm having difficulty with my research. can anyone give any information regarding this football team and its financial trouble.
asked by Rai 
home economics
Unemployment rate is unacceptably high. Is this positive economics, normative economics, or art of economics and why
asked by nathan 
Algebra II
1)Find the exact value of sin 165 degrees. Answer: (sqrt6 + sqrt2)/4 2) Simplify: (4m/5n^2) (n/2m) Answer: (8m^25n^3)/10n^2m Thanks
asked by Lucy 
physics
An apartment has a living room whose dimensions are 2.5 m 4.8 m 5.9 m. Assume that the air in the room is composed of 79% nitrogen (N2) and 21% oxygen (O2). At a temperature of 27°C and a pressure of 1.01 105 Pa, what is the mass (in grams) of the air?
asked by mike 
calc help
the position function of a particle is given by s=t^3–4t^2–7t t>=0 where s is measured in meters and t in seconds. When does the particle reach a velocity of 10 m/s?
asked by Adam 
Science: heart beats.
I was wondering if anybody could help me with my science assignment.I was required to write out a method for a controlled experiment testing my hypothesis: "Physical activity affects heart rate" and I've no idea what my method is to test out this
asked by LiEN 
math
A school has 6th, 7th and 8th period Social Studies classes. One student from each class will be chosen to represent the school in an essay contest. The 6th period finalists are Mike, Sara, Luis and Ed. The 7th period finalists are Ben, Eric, and Sandy.
asked by kevin 
chem
a flask containing 155cm^3 of hydrogen was collected under a pressure of 22.5 kPa. what pressure would have been required for the volume of gas to have been 90.0 cm^3 assuming the same temperature?
asked by jerson 
chemistry
Where can I find the reaction that produces ethyl formate, which is Methanol and Methanoic acid?
asked by Johnathan 
chemistry to Dr. Bob
Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. MnO4– + H+ + C2O42– Mn2+ + H2O + CO2 I'm not exactly sure how to do this question..Help?
asked by rich 
Science
Which of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'? A. A blank is composed of the solvent used to dissolve the analyte. For this experiment, the solvent is a combination of sulfuric acid, phosphoric
asked by John 
Math
If r = 5 z then 15 z = 3 y, then r = 1. y 2. 2 y 3. 5 y 4. 10 y 5. 15 y
asked by Irene 
Physics
If the third harmonic of a standing wave in a vibrating string is 600 Hz, what is the fundamental frequency?
asked by Marty 
Math
Jim is able to sell a handcarved statue for $670 which was a 35% profit over his cost. How much did the statue originally cost him?
asked by Irene 
English Expression
Let's find out the differences between Parent's Day in our country and Mother's Day or Father's Day in America. In our country, a memorial day is set by a special date. However, in America, it can be set as an ordinal number day of a special month. For
asked by John 
music
Hi, I am looking for an old english song, but I don't remember the song title, its a slow love song and the only thing i remember is that the singers are all male and there are more than one, some asian looking probably japanese and also caucasians. The
asked by nic 
physics
An incident Xray photon of wavelength 0.2800nm is scattered from an electron that is initially at rest. The photon is scattered at an angle of 180.0 degrees and has a wavelength of 0.2849nm. Use the conservation of linear momentum to find the momentum
asked by Leah 
Physics Help Requested!
QUESTION What is the change in energy of the hydrogen atom as the electron makes the transition from the n=3 energy level to the n=1 energy level? ANSWER xxx eV
asked by Chelsea 
french/francais
I need to find out the english for the following french words, I have found the answers but it doesn't make a lot of sense when translated to english. these items are on a list of things to take on a trip. bidon = can (when looking at the list of items can
asked by helen 
Biology
how are the anthers of a flower adapted to distribute pollen?
asked by Candice 
physics
In a diesel engine, the piston compresses air at 302 K to a volume that is 0.0628 of the original volume and a pressure that is 48.2 times the original pressure. What is the temperature of the air after the compression? I know pv = nRT, but I don't know
asked by Karen 
calculus
Let f(x)=–5x(x–5). Then f'(–1)= And after simplifying f'(x)= Hint: You may want to expand and simplify the expression for f(x) first.
asked by John 
Algebra II
Find the exact solution(s) of the system: (x^2/4)y^2=1 and x=y^2+1 Answer:(4,sqrt3),(4,sqrt3) 2)Write an equation for an ellipse if the endpoints of the major axis are at (8,1) and (8,1) and the endpoints of the minor axis are at (0,1) and (0,3).
asked by Lucy 
help with SCI
Are we born with a certain number of fat cells and as we get fatter we get more fat cells or do the fat cells we have just get bigger?
asked by Dawn 
lyman
find the value of 20x when x= 10
asked by mary 
writing a negative message to a superior
My issue is that I need a first paragraph buffer before I break the bad news to a superior. Any suggestions?
asked by Sissy 
Weight Record
Who is the heaviest person in history and what was his/her peak weight? I have heard that the record is held by a woman named Carol Yager, who weighed 1,800 lbs in her prime. What would a person need to do if they wanted to break this record?
asked by Toby 
physics
An ideal gas at 18.5°C and a pressure of 1.54 105 Pa occupies a volume of 2.10 m3. (a) How many moles of gas are present? moles (b) If the volume is raised to 5.30 m3 and the temperature raised to 31.0°C, what will be the pressure of the gas? Pa
asked by Sophia 
sales tax
swaetshirts are on sale for 26 dollars and are 15% off. what is the sales price before tax
asked by kc 
Math
SO how many mins. are in 900 s
asked by JERRY 
Math
How to find the decimal equivalent of the mixed number and the mixed number is 4 2/5
asked by PAULA 
Chemistry
You start at sea level on the beach in California. What would the atmospheric pressure be? Then you move to Los Angeles where the altitude is 87 meters above sea level what happens to the boiling point?
asked by Chrisy 
career day
I would like to be a Gynecologist when I grown up.So,I have to provide all details to describe a Gynecologist.My principal said he need about 10 pages, please I need help. Thank you
asked by michael 
Calculus
Let f(x)=7x/x–6 Then f'(9)= And after simplifying f'(x)=
asked by John 
international law paper
can you please revise. thank you Indeed, the Supreme Court of the United States and the lower federal courts have established the set of rules defining the law and practice of the United States. In particular, regarding the exercise of criminal and civil
asked by Christi 
English Expression
Let's find out how Parents' Day is different from country to country, and let's learn the expressions related to congratulation or praise. O Answering praise O Saying one's own opinion O Answering praise or congratulation How do you express the mind of
asked by John 
year 7 music
explanation of musical chords and an example. thanks for help.
asked by ollie 
Math
How to simplify? 11h 179min
asked by Sami 
Math
SO how many mins. are in 900 s
asked by James 
Math
Can someone explain this problem to me, I cannot figure out how they came up with the answer. The example in my book does not work with this problem. Find the minor for the element in the 1strow and 2ndcolumn. 3 2 1 19 13 18 19 12 7 correct answer is:
asked by Sara 
Science
I need to write a paper (15002500)on Scientific Inquiry. I need to answer the impact society has had on the progress, if ethical or moral values figure into the research and sharing of information. I have used different search engines, but none have come
asked by Kally 
chemistry
how does band gap energy work? when dealing with voltages and color change from LEDs[depends on phosphorous percentage]
asked by sara 
chemistry
Given one of the starting materials and end product for each of the following reactions, show all reactants, reaction conditions in brackets (where known) and products. fluoroethane from ethanol
asked by Manny 
science
i have to write something about a specific kidney disease. Is acute renal failure specific enough to write about?
asked by maggie r 
Do you know where I could find these vides?
I am looking for two educational videos: one is entitled "Integrated Curriculum" and the other is a Shoe Store Video... both focus on children in pretend play and children playing an active part of the learning environment.... If you have seen these videos
asked by MARY 
French
This isnt really homework, but I kinda need to know this... How do you know when to use Estce que Astu or tu as So this is what it says on my sheet thing... 3 different ways to ask questions, plus how to respond to questions 1. Inversion : Tu as un
asked by Slappy 
science
Write a 700 to 1,050word paper in APA format that includes the following: o A brief description of the water resource problem in the video and how it originated. o A management and sustainment plan that you think will benefit both sides of the issue. o
asked by BaBa 
ENGLISH
I wanted to know if you can give me examples on connotation, because i looked throughout the internet and im still kind of confused. Thanks
asked by Soraya 
English
Identifying antecedents 10a. The antecedent in the following sentence is students: Students in online classes have to be organized to keep up with their assignments. 10b. The antecedent in the following sentence is class: Students in online classes have to
asked by Hilda 
Filing/medical information
I was trying to find information on what differnt numbering filing systems mean such as .... serial unit and unit number etc I can't find any thing thanks of the help
asked by Aleecia 
president bush
can anyone help me find a quote from president bush and what he says about funding for no child left behind act?
asked by maggie r 
math
y=4x  3, work out the value of x when y =11
asked by beth 
Math
How to find the decimal equivalent of the mixed number and the mixed number is 4 2/5
asked by Suzie 
Calculus
If f(x)=5x^3–2/x^4 find f'(x) I don't understand what I did wrong for this ((x^4)(4x+7)(4x^3)(5x^32))/(x^4)^2
asked by John 
soial studies
what are some stories /myths about rhea
asked by rhea 
dr bob science
In this answer 0.21 cal/g*C. does the degree small zero go over the g or over the C
asked by sam HELP 
science
what happens to microbes when they are packed in food tins?
asked by olivia