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October 20, 2014

Posts by jake


Total # Posts: 1,751

Chemistry
Carminic acid,a naturally occuring red pigment extracted from the cochineal insect, contains only C,H,and O. It was commonly used as a dye in the first half of the nineteenth century. It is 53.66% C and 4.09% H by mass. A titration of the 0.3602 g sample pf the carminic acid ...
August 27, 2007

physics- electrodynamics
can someone walk me through this --- you'd be a lifesaver a rectangular pipe running parallel to the z axis(-‡ to +‡) has 3 grounded metal sides at y=0, y=a and x=0. the fourth side at x=b is maintained at a specified potential v0(y). a. Develop a ...
August 5, 2007

science
Are there any related structure from an asprin? To show how important an asprin is from using a carboxylic acid. You need to clarify your question. I need to produce a related structure of the molecular features of carboxyli acid, size hydrocarbon group on ester and distance ...
July 12, 2007

social
Do poor people have the same expectations in life as rich people> Expectations for what? Life goals? What's for dinner tomorrow? Their golf scores? Geeze kido, can you narrow it down a bit? It also depends on which poor people you are discussing. If poor people are ...
May 17, 2007

spanish
Did evita help the ppl of argentina..who did she help and how so? and Who did she hurt in her endeavors Thank you for using the Jiskha Homework Help Forum. Here are some sites for Eva Duarte Perón: 1. http://www.evitaperon.org/ (You can see and hear her here.) 2. http://...
May 16, 2007

physics
Can someone check these? 1. What device, developed in 1970, is able to make images of individual atoms? 1. The X-ray crystallographer 2. The laser 3. The Brownian motion detector 4. The scanning electron microscope My answer: 4 2. Which of the following is smallest? 1. Proton ...
May 8, 2007

health
This isn't a school question, this is for my own understanding. I'm thinking about majoring in it. What is the difference between a respiratory care person and a respiratory therapist? I think they are the same. And could someone tell me what goes into the job of ...
May 6, 2007

English
Could someone please help me make this feature article flow and be enticeing to the reader? With winter on the horizon, many Australians are again facing the prospect of drought. If there isn’t a better than average rain season this year many Australian farmers will be ...
May 5, 2007

math,correction
1/2(y-10)+y distributive propertys
April 19, 2007

chem
A solution contains 32 g of KNO3 per 100g of water at 25 degree C. Is the solution unsaturated, saturated, or supersaturated? I think its saturated Look at your saturation chart. I will be happy to critique your thinking. is there one online?
April 5, 2007

physics
When you hold your hand palm-up, the atmosphere exerts a force of about 800 N on the palm of your hand. Comparing this force with I. the force on the back of the hand, II. the force on the palm when you are holding your hand vertical, III. the force on the palm when it is palm...
February 27, 2007

Complex numbers
For the transformation w=(z+i)/(z-i) show that as z moves along the real axis, w moves along a circle centre O and radius 1 I do not know where to start changing it to polar form will help w=magnitude @ (arctan 1/z - arctan -1/z) where magnitude is sqrt (z^2+1)/(z^2+1) or w= 1...
February 24, 2007

Maths again
For the transformation w=z^2, show that as z moves once round the circle centre O and radius 2, w moves twice round centre O radius 4. I am okay finding the radius and centre of the locus but how do I show it moves twice roundfor w for z turning once. See my other post. ...
February 24, 2007

Maths
For the transformation w=z^2, find the locus of w when z lies on the imaginary axis. I thought the locus would be a line along the real axis as I thought w= r^2 or -r^2 but the book says it has argument pi which would mean only on the negative real axis ie w= -r^2 why both are...
February 24, 2007

maths
For the transformation w=z^2, find the locus of w when z lies on the imaginary axis. I thought the locus would be a line along the real axis as I thought w= r^2 or -r^2 but the book says it has argument pi which would mean only on the negative real axis ie w= -r^2 why both are...
February 23, 2007

maths complex numbers
Can abs(28-7w)=7abs(w) be written as abs(w-4)=abs(w) and if so why surely it should be abs(4-w)=abs(w) can any one explain why I can just chane the signs Yes, it can be written that way. I dont see that you have changed any signs, you factored a postive seven out of both sides...
February 23, 2007

physical science
How to learn to do the formulas for finding speed, distnace, and etc.?? *w*w*w*.*a*s*k*.*c*o*m* hey i cant help but heres a hint just go 2 (go on the words w/ the stares around them )and ask the question *w*w*w*.*a*s*k*.*c*o*m* hey i cant help but heres a hint just go 2 (go on...
February 21, 2007

calculus
a bacteria pop. grows exponentially. There are 1500 bacteria after 3 hours and 20,000 after 8 hours. ahving trouble finding the initial bacteria pop. thanks for the help In five hours the population get's larger by a factor 13 + 1/3-----> N(t) = N_0 * (13 + 1/3)^(t/5 ...
February 15, 2007

Maths- complex numbers
Find tan(3 theta) in terms of tan theta Use the formula tan (a + b) = (tan a + tan b)/[1 - tan a tan b) in two steps. First, let a = b = theta and get a formula for tan (2 theta). tan (2 theta) = 2 tan theta/[(1 - tan theta)^2] Then write down the equation for tan (2 theta + ...
February 13, 2007

Maths
Find tan(3 theta) in terms of tan theta
February 12, 2007

unscrambling a word
unscramble hautis hiatus
February 5, 2007

Maths
Given that arg((z-1)/(z-2i)) = pi/4 describe the locus of P and sketch this on an argand diagram. Show that the point (1,3) lies on this locus. I know it is an arc subtended from the points (0,2) and (1,0) but I do not know how to find the centre of the circle which I am ...
February 5, 2007

Maths
Given that arg((z-1)/(z-2i)) = pi/4 describe the locus of P and sketch this on an argand diagram. Show that the point (1,3) lies on this locus. I know it is an arc subtended from the points (0,2) and (1,0) but I do not know how to find the centre of the circle which I am ...
February 4, 2007

Maths
Given that arg((z-1)/(z-2i)) = pi/4 describe the locus of P and sketch this on an argand diagram. Show that the point (1,3) lies on this locus. I know it is an arc subtended from the points (0,2) and (1,0) but I do not know how to find the centre of the circle which I am ...
February 4, 2007

Social Studies Question
what is our environment?
February 2, 2007

Statistics
Check my answers please! Thanks a lot. Five students reported that the previous night they slept: 7,8,7,10,9 hours. Calculate the sample varience and standard deviation. sample varience = 1346.5 standard deviation = 36.7 Consider this. Ths standard deviation can never be ...
February 1, 2007

math
i need to integrate: (secx)^4 dx let u = sec x dv =sec^3 x dx Start with this. Then, you will have to deal with the integral of sec. You should be able to solve it after a few steps. Looks a little messy.
February 1, 2007

Math -
What would the interval be for a bar graph with the following data: 104,135,124,144,122 Highest number minus lowest number 144-104 = 40
January 25, 2007

HELPPPPP
A diver descends from a salvage ship to the ocean floor at a depth of 35 m below the surface. The density of ocean water is 1.025x10^3 kg/m^3. a) Calculate the guage pressure on the diver on the ocean floor. b) Calculate the absolute pressure on the diver on the ocean floor. ...
January 21, 2007

analogies
insurmountable: disadvantage Choices impermeable:water indomitable:defeat interminable:tedium inevitable:drawback insuperable:barrier and a sentence to prove How to solve analogies: http://www.teachervision.fen.com/vocabulary/reading-comprehension/6697.html Use with http://www...
January 15, 2007

maths 2
The original question I had was write arcsin4 in the form a+ib. I manage and understand how to get so far BUT How do I get from cosacoshb-isinasinhb=4 to 2m(pi)+/- iarccosh4 arcsin4 = a + b i ---> 4 = sin(a + bi) sin(a + bi) = sin(a)cos(bi) + cos(a) sin(bi) cos(bi) = cosh(...
January 14, 2007

Maths
How do I write arcsin4 in the form a+ib. I know the answer but do not Know how to get to it Take sinus of both sides: 4 = sin(a)cosh(b) + i cos(a)sinh(b) Equate real and imaginary parts. You then see that you can put a = pi/2. And it then follows that b = arccosh(4) Thanks for...
January 14, 2007

HELP
How United States and United Nation helping for Darfur? Please give me each exsample about Money, Aid and Military. And Is it enough? I already know US and UN gave Darfur some troopes, but I don't know Money and Aid. Essentially, the U.S. has not helped in Darfur.
January 11, 2007

Government
Why other countries (like Unites states, united nations) shold help victims in genocide of darfur? Because there are African nations. Couldn't African Nations help victims? Some African nations are helping the victims, but it doesn't look as though they are very ...
January 7, 2007

Government
How did United States help the victims for genocide of Durdar? From what I read the main action that the U.S. has taken is to urge the U.N. to recognize that the situation in Darfur (note spelling) is a genocide and to send U.N. troops to help stop the attrocities. Check these...
January 7, 2007

To: SraJMcGin
Thanks for the help. I really appreciate it. Does this look better? Hola. Me llamo Danilo. Soy de Massachusetts. Tengo catorce años. Mi cumpleaños es el trece de febrero. Mi clase favorita es las ciencias porque es muy interesante. No me gusta la clase de matem&...
January 2, 2007

Geography
you all got it all wrong you idiots. And you schjool is a dump
January 2, 2007

Spanish
Can someone proofread this for me. I know I don't have the accents in- its for a presentation not a paper. Thanks. Hola. Me llamo Danilo. Soy de Massachusetts. Tengo catorce anos. Mis cumpleanos es el trece de febrero. Mi clase favorita es las ciencias porque es muy ...
January 1, 2007

Economics
Isn't a monopolistic competitor most likely to earn zero economic profits in the long run, due mainly to the assumption of easy entry and exit? I would argue no, a monopolistic competitor is likely to earn economic profits. Almost by definition, a monopolistic competitor ...
December 9, 2006

economics
In long-run equilibrium, the perfectly competitive firm's price is equal to which of the following: short-run marginal cost minimum short-run average total cost marginal revenue all the above I think that it is all the above. Am I correct? I too would go with all of the ...
December 8, 2006

ethnics help
Im an instructor at Axia and Im letting you know...for your own good: Do not plagiarized...do your own work or you will be expelled.
November 2, 2006

imperative sentence
ulol gshjsakj ldklklf l;fklklb dflgklkb;d kick your usk
October 18, 2006

Science
_______ belief systems play an important role in making decisions about human behavior and concerns please help Ãnd quick This is a very open-ended statement in my opinion. The most natural response to me seems like religious belief systems, but philosophical belief ...
September 28, 2006

Science
_______ deals with moral values about what is good or bad Please help and quick Probably ethics, but that deals with right and wrong, rights and duties as well as moral values of good and bad, among other concepts.
September 28, 2006

Science
A __________ is a rule that describes the behavuor of something in nature usually without explaining why the behavior occurs Please help and quick! That's two freebies. Give us your feedback on the others and someone will review your work.
September 28, 2006

Science
Scientific knowledge________ as testing procedures and instruments improve please help Ãnd quick! Surely you have notes and/or a text that you can use. Otherwise, we are just searching for the right word out of millions of words. I might guess "improves" or &...
September 28, 2006

Science Help and Quick
okay Cicilizations advanced to the use of ___________ to measure things observed and developed a scientifiv approach for testing inferences or conclusions What is the ÃNSWER??? please help instruments, perhaps? There isn't much to go on.Punctuation would help some, ...
September 28, 2006

Algebra Zero Product Rule
I'm working with the zero product rule and I've somehow lost my way on a certain problem pattern. (x+8)(x-3)= -30 Is the pattern and the answer in the book says -2 or -3, but when I do the problem... x²+5x-24= -30 x²+5x+6= 0 (x+6)(x-1) x= -6 x= 1 That is how ...
September 2, 2006

homework
jahala is 100 % just took the test (:
July 3, 2006

mathamatics
can i have a list of times tables And your question is? 1> Googal stands for how many zeros after one? 2> Who invented logarithm for fast calculation? what is the product of 9 & 6? How could I work a problem that is: I have a bacteria that replicates every 12.5 minutes ...
August 31, 2005

Microeconomics
Your opportunity cost is the cost of the next best alternative you are forgoing to go skiing. In this case that is work and studying. The trip costs $350 + $60 for skiis + $40 for food. The trip will cost a total of $450. Your opportunity cost is $450 plus what you lose from ...
June 17, 2005

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