Questions Asked on
January 27, 2008

biochemistry with more info that was needed
Calculate the weight of the buffers you will use to make the buffers for Part A for all the buffer possibilities listed under procedures in Part A, step 1. In other words, how many grams do you need to make 100 mL of a 0.1 M buffer? Buffer pKa1 pKa2 pKa3
asked by stew 
AP Physics
A uniform spherical shell of mass M and radius R rotates about a vertical axiss on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object mass m.
asked by Kristen 
chemistry
An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of
asked by John 
AP Physics
A record turntable is rotating at 33 and 1/3 rev/min. A watermelon seed is on the turntable 7.5 from the axis of rotation Calculate the acceleration of the seed assuming that it does not slip? Suppose that the turntable achieves its angular speed by
asked by Kristen 
AP physics
A uniform spherical shell of mass M and radius R rotates about a vertical axiss on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object mass m.
asked by Kristen 
physics
(a) How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 30.0 cm in diameter to produce an electric field of 1150 N/C just outside the surface of the sphere? (b) what is the electric field at a point 10.0
asked by J 
Physics
A bird is flying with a speed of 18.0 m/s over water when it accidently drops a 2.00 kg fish. If the altitude of the bird is 5.40 m and the friction is disreguarded,what is the speed of the fish when it hits the water?
asked by Cassidy 
physics
During a violent electric storm, a car is struck by a falling highvoltage wire that puts an excess charge of 850 uC on the metal car. (a) how much of this charge is on the inner surface of the car? (b) How much is on the outer surface? ok...I didn't think
asked by J 
Chemistry
A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm
asked by David 
AP Physics
A flywheel turns through 46 rev as it slows from an angular speed of 3.1 rad/s to a stop. Assuming a constant angular acceleration, find the time for it to come to rest? What is its angular acceleration (in rad/s^2) ? How much time is required for it to
asked by ed 
Physics
A rock is thrown vertically upward from ground level at time t=0. At time t=1.3s it passes the top of the tall tower, and 1.1s later it reaches its maximum height. What is the height of the tower? can someone please get me started....tnx in advance :)
asked by Mary 
geometry
"An angle has a measure three times that of its complement. What is the measure of the angle?" Complementary angles add up to 90 degrees. If x is the complement and 3x is the angle, and you added them to have 4x, then you'd have 4x=90, right? That would
asked by Bee 
apchem
A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm
asked by alk 
3rd grade english
wat is a noun
asked by Dakota 
us history
what factors finally turn the tide for womens suffrage? On what grounds did people resist womens suffrage? what is the significance of the phrase"the perfect thirtysixth"?
asked by tt 
statistics
The following frequency distribution presents a set of exam scores for a class of N= 20 students. X F CF % C% 9099 4 20 20 100 8089 7 16 35 80 7079 4 9 20 45 6069 3 5 15 25 5089 2 2 10 10 a)Using interpolation find the 30th percentile. The answer I
asked by Lezlie 
AP physics
do you guys have an someone that good with advanced physics, because i have a few problems that i am not sure how to do and its for my AP physics class, and I wasn't sure if you had someone on board now that could help thanks
asked by Kristen 
biology: the study of life
2. what is meant by the statement "living things do not exist in isolation"? TRUE/FALSE 3.people study biology only if they are planning to become biologists. 4. by studying biology you can better appreciate the great diversity of species on earth and the
asked by natalie 
physics
A 2.8 kg air mattress is 2 m long, .5 m wide, & .1 m thick. What mass can it support in water before sinking?
asked by Nico 
biochemistry
How many grams do you need to make 100 mL of a 0.1 M buffer? I got .01 grams. Is that right? If not, will you show me the right answer and how you got it? Thanks.
asked by Anonymous 
physics
Define STPD, ATPD, BTPS and list the values. I'm in college and our books haven't came in from the bookstore. I don't understand how the prof. is still making us do this HW. my younger brother told me I should try to get help from this site since it helped
asked by jamie 
chemistry
An unknown was prepared with the concentration of 0.000630 M. A Beer's Law plot was prepared using the absorbance values from standard solutions of ASA and a line drawn through all the points passed through the origin with a slope of 1550.2 M–1. The
asked by john 
math
1)y=x²3x+2 2)y=8x16/x3 A)Sketch both on axes B)Calculate coordinate of points of intersection I have drawn both on axes. I am having trouble with B). I know you have to do y=y. So far i have done this; x²3x+2=8x16/x3 (x3)(x²3x+2)=8x16
asked by Anonymous 
physics(gas laws)
Got a question 3. Given 325 ml of saturated gas at 760 mmHg and 25°C, what would be its volume if dry at the same pressure and temperature? I got confused when I read 'if dry' Does that mean I have to subtract something out of 760mmHg? And would I used
asked by abby 
PHysics...last one :)
hello sorry once again...this will be my last question...i promise...but here is the question.... A red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is
asked by Mary 
maths
1)y=x²3x+2 2)y=8x16/x3 A)Sketch both on axes B)Calculate coordinate of points of intersection I have drawn both on axes. I am having trouble with B). I know you have to do y=y.
asked by Anonymous 
world history
What measures did wartime governments take to control (a)national economies (b) public opinion?
asked by Sally Ann 
algebra
Emily wants to buy turquoise stones on her trip to New MExico to give to at least 4 of her friends. The gift shop sells stones for either $4 or $6 per stone. Emily has no more than $30. What are the system of inequalities so I could be able to graph them?
asked by aj 
physics
One last question: If a 12lb. block is slowly tilted from horizontal when the plank reaches 30 degrees the block begins to slide. To find the coefficient of the static friction you take the tangent form of 30 degrees? To find the friction force you
asked by Charles 
English
The Odyssey By Homer  Book 11 What lesson does Odysseus learn about himself? How has it strengthened his resolve to return to Ithaka?
asked by Mark 
AP physics
On Block has a mass M=500 g, the other has mass m=460 g, they are hooked to a string and is on a pulley will one mass on either side, the pulley, which is mounted in horizontal frictionless bearings, has a radius of 5 cm. When released from rest, the
asked by Kristen 
physics
starting from rest, a disk rotates about its central axis with constant angular acceleration. In 4 seconds, it has rotated 50 rad. What was the angualr acceleration during this time? What is the instantaneous angular velocity of the disk at the end of the
asked by Kristen 
Data managment math
1: What is the probability that at least two of the 12 councillors elected in the next municipal election will have the same birthdays on the same day? 2:Hoyda has 15 percent of the car market. If a random sample of 20 auto mobiles is conducted what is the
asked by Samir 
world history
how did the peace treaties both follow and violate Wilson principle of selfdetermination?
asked by Anna 
Science
What is a good science project to do? I am in 8th grade and am studying earth science. I need to present the project in front of class. Im really nervouse.
asked by Katy 
chemistry
An unknown was prepared with the concentration of 0.000630 M. A Beer's Law plot was prepared using the absorbance values from standard solutions of ASA and a line drawn through all the points passed through the origin with a slope of 1550.2 M–1. The
asked by Michael 
Life Science
I tried looking and can't find or understand where the following answer are. Please help me, I feel like I'm going crazy. I’m not sure about the answers I wrote but if someone could correct them and help me out with the ones I didn’t get.
asked by Bretagne 
Rounding
Round to two decimal places a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995  0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946 check my answers please a. 3.15 b. 6.00 c. 42 d. 6.02 x 10^23 e. 18.33 f. 9.99 g. 448.69 h. 1.25
asked by Britt 
Significant Figures
Report the following to two significant figures a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995  0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946
asked by Britt 
biology sex linked diseases, punnet sqares
[IMG]ht tp ://i25 .tinypic. com/w7nyc. jpg[/IMG] i have an idea of how to do the questions above but can someone do them to so i can clarify?
asked by Jan 
english
i am not very good at analyzing/interpreting poems and figuring out their meaning. what are some tips/strategies/methods that i could use to better my poetry understandings? and please help me to interpret this here poem: Starlight Philip Levine My father
asked by todi 
psychology
1)What is your opinion of the Evolutionary theory of personality? How might you see yourselftraits of yourself operating for an evolutionary purpose? I am not quite understanding the theory of evolutionary theory of personality. Can someone please
asked by Phylis 
chemistry
the atomic number of oxygen is 8. How many protons, neutrons and electrons are in an oxygen icon with a charge of 2 and a mass number of 17?
asked by cynthia 
Physics
A volleyball is spiked downward at a 55 degree angle gom the vertical net.If the ball is traveling at 22m/s, what are its horizontal and vertical components?
asked by Ash 
chemistry
A 250 ml cylinder containing C2H4 at a pressure of 1.00 atm is connected by a valve to 950 ml cylinder containing PF3 at 2.50 atm pressure. Calculate the partial pressure (atm) of Pf3 when the valve is opened.
asked by betty 
reading/ language arts
hi... i need some similarities and differences between the movie and the book "the pearl"
asked by Gracie 
Sci
What are some Effects of Urbanization?
asked by RENE' 
Chemistry
For each of the compounds below, exlain why they do not have the same value for their standard heat of vaporization. 1. Propane and propanone 2. Propanone and 1propanol
asked by Allie 
world history
who do most modern historians think was responsible for the war? Germany is this answer right.
asked by Henrietta 
african literature
can somebody help me...please........ interpret the way of life, culture and aspirations of african people from the literary piece that they produced.
asked by klar maesen 
Physical Science
What is the process called that could be used to sepate dissolved particles from the liquid in a solution
asked by Kay 
Physics
How do you use this equation? mgh+1/2mvh=mgh+1/2mv^2+Fd
asked by Cassidy 
trig
i vertex has no segment, 2 vertex have 1 segment , 3 vertex have 3 segments, 4 vertex have 6 segment , 5 vertex have 10 segments, how many segments are needed to connect 20 points?
asked by maria 
social studies
i need a historic place or person from 1860 and under
asked by shienne 
Significant Figures
Report the following to two significant figures a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995  0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946 Can someone please check my answers a. 3.1 b. 6.0 c. 42 d. 6.0 x 10^23 e. 18 f. 10. g. 4.5 x
asked by Britt 
algebra
How do you work these problems? 8x7=15+19x 7.6x3.5x=65.6 7x23=25 1/3
asked by Casey 
world history
Why was Archuke Francis Ferdinand assassinated ?
asked by Henrietta 
humanities
The two different medieval accounts of creation in Genesis have caused scholars to believe that each was written at a different time by a different author. What are the two accounts? Where does one end and the other begin? How is creation described in
asked by Tiffany 
Science
If you need to speed up the rte at which your potatoes are cooking in boiling water, would it be better to turn up the heat or use a pressure cooker? why?
asked by Karen 
Chemistry
Calculate the entropy change of the universe (in J/K) when 43.4 g of ethanol vapor is condensed in a laboratory at 20.4 oC. Report your answer in scientific notation to three significant figures. If something is condensed, does that mean the system gaines
asked by Student 
science
[IMG]ht tp ://i25 .tinypic. com/w7nyc. jpg[/IMG] i have an idea of how to do the questions above but can someone do them to so i can clarify?
asked by jan 
world histoy
why did the United States declare war on Germany?
asked by JoAnna 
African literature
way of life of David Diop, in writing the literary piece Africa.
asked by Rosette 
world history
Describe the conditions in Europe after World War I.
asked by Anna 
English
How can I have a nice order of ideas in my paragraph so it doesn't ramble all over the place?
asked by Karthik 
calc
is the integral of 2x/(x^3x) =1/2ln(x+1)+1/2ln(x1) I got this by doing this: (\=integral sign) 2\1/(x^21) 2\1/(x+1)(x1) =A/(x+1)+B/(x1) =AxA+Bx+B=1 Ax+Bx=0 BA=1 B=1+A (1+A)x+Ax=0 x+Ax+Ax=0 1+AB=0 2A=1 A=1/2 B+1/2=1, B=1/2 etc.
asked by sarah 
Poetry
please read this poem and tell me how I can inprove it. Thanks! Where have you been I almost forgot you Its been a year or so Since I’ve seen you last Why did you have to come back I was trying to forget you And forget what you did Why bring back the bad
asked by Madison 
us history
In what ways did wilson support progressivism? In what ways did president Taft support the progressive agenda? Brefly describe theodore roosevelts progressive record what were some of the reform ideas at the turn of the century?
asked by tt 
Algebra
Suppose that a, b, and c are digits for which the number 708,16b,8c9 is a multiple of 99. Find a+b+c.
asked by Ash 
Chemisry
Use chemical principles of atomic structure and or chemical bonding to explain each of the following. 1. At 25.0 degrees C and 1atm, F2 is a gas, whereas I2 is a solid. 2. The melting point of NaF is 993 degrees C, whereas the melting point of CsCl is 645
asked by Josh 
chemistry
A 8.00 L cylinder containing SF6 at a pressure of 0.400 atm is connected by a valve to 91.0L cylinder containing 02 at 342 torr pressure. Both cylinders are at 8.00 C. Calculate the partial pressure (torr) of SF6 when the valve is opened and the
asked by betty 
physics
thank you for your help drwls
asked by Charles 
math
If in a problem it states 1.8 million how do I write that out in number form? Is it just 1.8 multiplied by a million to get 18,00,000
asked by confused 
algebra
Can you check these problems? 3x+13=96 x=6 87x=120 x=8
asked by Anonymous 
Physical Science
What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter?
asked by Kay 
Chem
In thermodynaics, what is the relationship between enthalpy (H) and heat (q)  [at constant pressure]?
asked by xX_Supaman_Xx 
world history
Describe how each of the following nation was drawn in the assassinated of Ferdinand, Germany, Russia, France and Britain.
asked by Monique 
algebra
the lines described by y=(5a+3x) and y=1/2x are perpendicular. what is the value of a?
asked by nichole 
HUMANITIES
WHY DO WE USE THE TERM CLASSICAL TO THE ANCIENT GREEK AND ROMAN CIVILIZATIONS?
asked by z 
Chemistry  HELP IGCSE
I have a chemistry exam tomorrow and I don't get the double bonding in covalent bonding I tried many websites , textbooks and other books and yet nothing worked Can someone please explain it clearely and in a simple way and please don't put any links for
asked by AMY 
math
solve the inequality: n^37n+6
asked by devon 
Biology
Can someone help me correct my answers and help me answer the questions not answered yet? Electron Tansport 1. Whats is the purpose of this pathway? 2. Where does it take place Mitochandria 3. What does this reaction need to proceed? Hydrogen,NADH and
asked by Bretagne 
science
Why is it not easy to observe individual chromosomes during the interphase?
asked by Alicia 
Accounting
For each fiscal year 2003, 2002, and 2001, is the amount of cash provided by operating activities more or less than the cash paid for dividends?
asked by Adrian 
Chemistry
If I am given a molecular hydrocarbon structure, how would I be able to tell how sp3 hybridized carbons it possesses? Like my current question asks How many sp3hydridized carbon atoms does 11cisretinal possess?
asked by Raj 
statistics
A set of seven scores has a mean of 10. If one of the scores is changed from X=15 to X=1, what will be the new value for the new mean? A sample of n=8 scores has a mean of M=12. One new score is added to the same and the new mean is found to be M=13.
asked by Joan 
Philosophy
Describe christianity's impact on philosophy. Include the topic of principle christianized philosophical issues.
asked by Angelina 
science
the difference with growing alfalfa sprouts in soil and cotton buds and how come it grows faster and taller in the soil
asked by kelli 
space
does our solar system move in the milky way galaxy?
asked by Isaac 
Math Analysis
A quartic polynomial Q(x) with real coefficients has zeros 2+i and 32i, find the other two zeros.
asked by Justin 
world history
Who is Archuke Francis Fernidad? Who is Sergi Sazona? What happen at Passchendule?
asked by Leo 
C Programming
I am new to c programming and I cannot understand the teacher for the life of me. It becomes very difficult to learn this stuff even just by reading. I'd greatly appreciate any help... The program asks for the user to input the radius and height of a right
asked by Brandon 
latin
I have to write an analysis of Catullus 8th poem. Tips on how to write analysis please?
asked by Anonymous 
Music
So, I need zo post my question again... I have to write a report for school on the topic of film music. I want to show my class mates how different you feel when you see a movie scene with two different musics. So I was looking for two versions of a scene
asked by Kelly 
science
I did this experiment and I found these validity issues: they never specified if temperature to be measured in celcius or faren., they never mentioned that the buckets were to be the same, stirring until your arms get tired is not a good idea, but I need
asked by peter 
science
the lowest point of a tranverse wave is called.....
asked by danielle 
algebra 2
how do i do this? 64 negative cubed divided by 4 to the negative fifth. the answer is 1/256.
asked by Miley 
world history
describe conditions in Europe after World War I. the total of death, the cost of the war, homes,farm,factories, roads churches had been shelled into rubble.
asked by Anna 
calc
is the integral of the square root of x*ln(x) =(2/3 x^(3/2))(lnx2/3) ?
asked by sarah 
calc
how would you do the integral of the sin(square root x) ? I just can't seem to get started
asked by sarah 
environmental
Climates modified by the oceans are called?
asked by deanna 
Sociology
Give an example of a human behavior that is considered deviant in one society but is not considered deviant in others. What are the factors that have contributed to this society's perspective of the deviant behavior? The human behavior I wanted to use is
asked by RAY 
Algebra
Digit d is randomly selected from the set {1, 2, 3, 4, 5, 6, 7, 8, 9}. Without replacement of d, another digit, e is selected. What is the probability that the two digit number de is a multiple of 3
asked by Ash 
Physics
A snail crawls up a bent piece of grass at 2cm/s. If the grass makes a 75 degree angle to the ground,what are the horizontal and vertical components of the snails velocity?
asked by Ash 
Philosophy
If you had to write a letter in the persona of an Eastern philosopher to one of his pupils, what would you write? That philosophers viewpoints concerning one of his philosophies needs to be included.
asked by greatdanelola 
chemistry
how to know clarify if the subtance is polar or nonpolar?
asked by robert 
general
need words that begin with X. thanks
asked by angelina 
world history
What impact did wartime failures have on Russia?
asked by John 
biochemistry
Is CAPS an acid or base? If it is an acid, what is its base? If it is a base, what is its acid? Also, is Tricine an acid or base? If it is an acid, what is its base? If it is a base, what is its acid? Thanks.
asked by stew 
MATH
64 negative cubed divided by 4 to the negative fifth. the answer is 1/256. Everytim I do this problem i keep getting 256. Can anyone help me?? PLEASE :)
asked by Miley 
geometry
Is a yield sign convex or concave?
asked by shorty 
MATH
I can't get the right answer on this question. The answer is 1/9. Question: (x^0 + 2y^0/x^02y^0)^2 (Damon can you please explain this one to me)
asked by Miley 
sci
what some Benefits of Urbanization?
asked by RENE' 
earth
The short term condition in the troposphere are called?
asked by deanna 
writing...
hi what should i include in my first paragraph on a compare and contrast essay??? please help asap
asked by Gabby 
critical Thinking
Cntrolling Irrational Fears After 9/11 outline the premises and conclusion of each argument you find
asked by Rhonda 
science
I did this experiment and I found these validity issues: they never specified if temperature to be measured in celcius or faren., they never mentioned that the buckets were to be the same, stirring until your arms get tired is not a good idea, but I need
asked by peter 
environmental
A measure of the moisture content of the air is called?
asked by deanna