Friday

November 28, 2014

November 28, 2014

Total # Posts: 1,777

**math**

Maybe re-wording this question will help you out. Find the distance between two points: a)(-4,3) and (5,-4) b)(-3,-2) and (3,5) I'm sure your teacher gave you this formula: d = sqroot [(x2 - x1)^2 + (y2 - y1)^2] where x and y are defined as (x,y) in the coordinate. x2 just...
*November 13, 2007*

**Chemistry - Kinetics**

a) Yes, you can probably tell because the activation energy gets lower and thus allow the reaction to speed up way faster than without a catalyst... it's kind of dumb to ask if in catalyst is involved in a CATALYZED reaction... b) No, the catalyst will get recycled at the ...
*November 13, 2007*

**Genetic**

I need to write a proposal of the possible traits we can actually measure in lab. What are some quantatitive traits of woodlice/isopod beside measuring their maximum speed.
*November 13, 2007*

**math**

What do you mean by "how would be the answer"? The answer to this problem is 1.
*November 7, 2007*

**math**

At 4:00 Joe's thermoter read 30C. He put it in the freezer and read it every 5 minutes. At 4:05pm, the temperature was 23C. At4:10pm the temperature was 16C.The pattern continues, when will the temperature be below 0C?
*November 5, 2007*

**Evolution**

In an experiment using quantitative genetic approaches to investigate the evolution of butterfly eye-spots as a model system for understanding development. There are 3 groups of butterfly populations: small (mean diameter = 2.6 mm), intermediate (3.4 mm), and large eyespots (3...
*November 5, 2007*

**Algebra 2**

The way I think of "range" is the possible values of the y-axis on your graph. The easiest way to see this is to actually enter the function into your graphing calculator and graph it out. In your example, you have a straight line with a slope of -1/3, so basically ...
*November 5, 2007*

**math**

how many possible 3 digit numbers are there that have a middle zero? how many possible 4 digit numbers are there that have two middle zeros? Explain your answears
*November 4, 2007*

**CHEMISTRY**

I don't even understand how this question works. How do I solve it? A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. suppose an oven's microwave is 13.7 cm. a container w/ 175 mL of water was placed...
*October 31, 2007*

**IB Math Studies**

Would it be appropriate to use a chi-square test for analysis of statistics in the following topics? •Number of Surgical Fatalities vs. U.S. State •Number of professional men’s soccer injuries vs. country of their team
*October 28, 2007*

**AP US History**

compare the rebellion of the american revolution to the rebellion of the civil war
*October 28, 2007*

**CHEM-HELP!!!!**

help? how do i calculate the heat of formation of a solid? i only know how to find the heat of formation of a liquid. here's what i have so far. delta t= 16.8 degrees c mass= 33.136 g cp = 4.184 j/g degrees c m cp delta t = -2329J (process is exothermic) what do i do now?
*October 24, 2007*

**English**

Does anyone recall the mythical beasts that were described on the map in Ondaatje's Running in The Family, the chapter entitled Tabula Asiae? I left my book in my locker ;/
*October 24, 2007*

**Chemistry**

Zinc is often used to calibrate calorimeters because it undergoes a very sharp phase transition from the solid to the liquid at 419.5°C. Calculate the enthalpy change when 5 g of zinc metal is heated from 100°C to the point where the entire sample is melted. (The heat ...
*October 23, 2007*

**Math**

If you say "10 less than y". Does it mean 10-y or y-10. Which is correct and why?
*October 17, 2007*

**CHEMISTRY**

If 142.38 g of l water at 21.7 degrees C is placed into a syrofoam cup with 174.36 g of ice at -27.5 degrees C what would be the final temperature of the entire contents at equilibrium? If it is partially frozen, how many g of the ice has melted? given values cp water = 4.184 ...
*October 14, 2007*

**computer class (please look!!!)**

use google book search to find the first line of page 3 in the book 'curious george goes to a chocolate factory' [sorry to make you do this hw but my internet is not fast enought to load this page] thx ^^!
*October 2, 2007*

**Chemistry**

2 HCl (aq) + Ba (OH2) (aq) ----> BaCl2 + 2 H20 (l) deltaH = -118 kJ Calculate the heat when 100.0 mL of 0.500 M HCl is mixed with 300.0 mL of 0.100 M Ba(Oh2). Assuming that the temp. of both solutions was initially 25.0 degrees C and that the final mixture has a mass of 400...
*October 1, 2007*

**CHEMISTRY**

A 2.75 g sample of the hydrocarbon acetone, CH3COCH3, is burned in a bomb calorimeter with 975 mL of water, initially at 23.50 degrees celsius. The bomb is constructed of 285.0 g of nickel metal having a specific heat capacity of Cp = 0.826 J/ g degrees C. The final ...
*September 30, 2007*

**Ap Chemistry**

Posted by Jake on Sunday, September 23, 2007 at 1:08pm. My objective is to find the molar volume of a gas. Is this the correct balanced equation for magnesium ribbon reacting with hydrochloric acid to form hydrogen gas? 2Mg (s) + 2HCL (l) ----> H2 (g) + 2MgCl (aq) Also, I&#...
*September 25, 2007*

**AP Chemistry**

Thanks, sir. This is what I did, could you tell me if its correct? given value 1.072 g/meter 1.072 g/m X .02 m [the magnesium ribbon was 2.0 cm] = 0.02144 gMg Then to find the moles of H2: 0.02144 g mg ( 1 mol Mg/24.31 g Mg) (2 mol H2/1 mol Mg) = 1.76 X 10^ -3
*September 23, 2007*

**AP Chemistry**

My objective is to find the molar mass of a gas. Is this the correct balanced equation for magnesium ribbon reacting with hydrochloric acid to form hydrogen gas? 2Mg (s) + 2HCL (l) ----> H2 (g) + 2MgCl (aq) Also, I'm required to find the mass of the magnesium ribbon in ...
*September 23, 2007*

**Economics**

economics
*September 22, 2007*

**pigskin geography**

i dentifly the panhandle state the the seattle seahaw will fly over going to their game
*September 19, 2007*

**american history**

What were republicans plans to do about Roosevelt not following through with things he said he would do? like not using the bullypullpit and stuff. PLEASE HELP!
*September 15, 2007*

**science**

how do u convert tons into kilograms?
*September 13, 2007*

**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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