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December 21, 2014

Posts by katie


Total # Posts: 1,716

WORLD HISTORY
What element, found in all plants and animals, is used by scientists to determine approximate dates for an artifact’s age?
March 25, 2009

Chemistry
What is the equivalence point in an acid-base titration? I'm supposed to do a virtual lab online and it tells you to find the equivalence point, but I don't know if that means when the pH is 7 or when the indicator changes colors.
March 24, 2009

english lit
She stoops to conquer- Which characters represent the restoration period and which represent the sentimental?
March 24, 2009

Spanish
Thank you very much! I am still a little confused, but it makes much more sense to me than it did before!
March 23, 2009

Spanish
¿Qué le duele mucho a Andrea? I have: El estómago ha dolado mucho a Andrea. I'm not sure if the le has to be in the answer though because I don't really understand what the le means.
March 23, 2009

Fluid Mechanics
A supersonic wind tunnel is to be operated at M=2.2 in the test section. Upstream from the test section, the nozzle throat area is 0.07 m². Air is supplied at stagnation conditions of 500 K and 1.0 MPa (abs). At one flow condition, while the tunnel is being brought up to ...
March 22, 2009

Fluid Mechanics
A small rocket motor, fueled with hydrogen and oxygen, is tested on a thrust stand at a simulated altitude of 10 km. The motor is operated at chamber stagnation conditions of 1500 K and 8.0 MPa (gage). The combustion product is water vapor, which may be treated as an ideal gas...
March 22, 2009

Fluid Mechanics
A converging-diverging nozzle with a throat area of 2 in² is connected to a large tank in which air is kept at a pressure of 80 psia and a temperature and a temperature of 60°F. If the nozzle is to operate at design conditions (flow is isentropic) and the ambient ...
March 22, 2009

Fluid Mechanics
A large tank supplies air to a converging nozzle that discharges to atmospheric pressure. Assume the flow is reversible and adiabatic. For what range of tank pressures will the flow at the nozzle exit be sonic? If the tank pressure is 600 kPa (abs) and the temperature is 600 K...
March 22, 2009

Math
*CORRECTION* I am supposed to find the 4 vertices of the ellipse 1=(((x+1)^2)/4)+(((y-4)^2)/9) How would I go about doing that?
March 9, 2009

Math
My teacher told me the answers were (-1,7) (-3,4) (1,4) and (-1,1). But i just didn't understand how to do it, the bell rang.
March 9, 2009

Math
I am supposed to find the 4 vertices of the ellipse 1=(((x+1)^2)/4)+(((y-4)^20/9) How would I go about doing that?
March 9, 2009

PreCalculus
A kite has a lifting surface area of 630 square meters. Suppose the wind is blowing against the kite with a force of 100 newtons at an angle of 20 degrees above the horizontal. How much force is lifting the kite? I tried to draw a diagram, but I don't really understand ...
March 8, 2009

Chemistry
Thanks! That makes a lot more sense.
March 8, 2009

Chemistry
A student must make 500 mL of a 1.5 M HCl solution. The student has plenty of water and a stock solution of 6.0 M HCl to use. What volume of the 6.0 M HCl solution must be added to what volume of water to make the desired 500 mL of 1.5 M solution? I don't really know how ...
March 8, 2009

English
I am writing a character analysis of Laura from The Glass Menagerie, and I need to use quotations from the play. How do you cite these? Also, how do I know when to put a quote in a little indented paragraph thing of its own?
March 1, 2009

French
Can someone please explain to me the word "en", like why you would use it and it's different meanings? It seems like there's 50 ways to use it and I'm lost!
February 26, 2009

Math
I know the answer to this problem but I have no idea how to get there. Solve for all values of x if 0 is less than or equal to x, which is less than or equal to 2pie. (cosine squared of 4x) + (cosine of 4x)=0 The answer is: x= pie/8, 3pie/8, 5pie/8, 7pie/8, 9pie/8, 11pie/8, ...
February 25, 2009

Math
For the first problem all you have to do is add 3 hours to 10:00am.(count 10:00 to 11:00 (1 hour), 11:00 to 12:00 (2 hours), etc.) For the second problem just count backwarks 8 hours (i.e. 3 hours earlier of 5:30 would be 2:30 (5:30 to 4:30 (1 hour), 4:30 to 3:30 (2 hours), 3:...
February 25, 2009

Math
Sorry, it seems cutting from Word and pasting here doesn't work. again teh problem is. Solve for all values of c if 0 is less than or equal to x, which is less than or equal to 2pie. (cosine squared of 4x) + (cosine of 4x)=0 the answer is x= pie/8, 3pie/8, 5pie/8, 7pie/8, ...
February 25, 2009

Math
I have the answer to this question but I have no idea how to get there. Solve for all values of x if 0¡Âx¡Â2¥ð. cos©÷(4x)+cos(4x)=0 The answer I have is: x=¥ð/8, 3¥ð/8, 5¥ð/8, 7¥ð/8, 9¥ð/8, 11&...
February 25, 2009

math
1. (Tan ө + cos ө)/ (sec ө + cot ө) 2. (Tan ө + cot ө)/ sec ө
February 21, 2009

math
how do I simplify this? 1. (Tan ө + cos ө)/ (sec ө + cot ө) 2. (Tan ө + cot ө)/ sec ө
February 21, 2009

Math
How would you simplify and prove (csc x - cot x) = (1-cos x)/(1+cos x)? I've tried a lot of different starts, but I keep getting stuck.
February 17, 2009

7th
music is something you feel from the heart you have to feel the rythem or the beat of life.....
February 16, 2009

year 8 Geography
how does a river change from a source to the mouth
February 15, 2009

statistics
I dont understand how to answer this: relate the three measures of central tendency to a normal distribution- I looked it up online and it said that the mean, median, and mode are all the same but i dont understand how that can be
February 12, 2009

Math/3rd grade
They would have talked for 18 minutes twice of the usual time which would be 8 plus 10 because 10 minutes more so it would equal 18...... 4+4=8+10=18
February 9, 2009

Physics
Thanks a lot. I think it's great what you teachers do on this site. Very generous of you all to help us out.
February 9, 2009

Physics
I'm confused about significant digits in multi-step problems. If I have something like (7.004 +0.2230)/(15.1-0.033+12.07) do I first do the addition and round to 4 sig figs and then do the denominator and round to 2 sig figs and finally divide? Or do I just work everything...
February 9, 2009

Algebra (urgent!)
Find an equivalent inequality with absolute value #1: -5 < y < 5 #2: x < -4 or 4 < x I'm not sure at all how to solve this problem. Please walk me through the process. Thanks!
February 3, 2009

Algebra 1
Well, here's how to do it your way: First, to find the y intercept, plug in 0 for x. That means 5 times 0 - something equals five. That means that it must be negative 5. Then, put 0 in for y. 5 times something - 0 equals five, so obviously x is 1. Another way is to take ...
February 3, 2009

Algebra (please help!)
Find an equivalent inequality with absolute value #1: -5 < y < 5 #2: x < -4 or 4 < x I'm not sure at all how to solve this problem. Please walk me through the process. Thanks!
February 3, 2009

math
The y-intercept is 7. A way to know what is the y-intercept when you are in that form (slope-intercept form), it is the number that does not have an x next to it. To find the x-intercept, put 0 in the place of x and find what would be x to equal 0. Hope I helped!
February 3, 2009

math
Try to find the difference between each number. Notice that if you take 12 away from 16, you get 4, and the same if you take 16 away from 20. Therefore, the pattern is add 4. I hope I helped!
February 3, 2009

Algebra
Find an equivalent inequality with absolute value #1: -5 < y < 5 #2: x < -4 or 4 < x I'm not sure at all how to solve this problem. Please walk me through the process. Thanks!
February 3, 2009

science
I think the it was magnetic force that pulled them up, if I am recalling that correctly, because magnetic force is related to magnets. Sorry, I don't know how to help you with your second question. I hope I helped you a little!
February 3, 2009

math
First, distribute. Basically, multiply the 2 by 4 and by the -6. That makes it be: 5x + 8x + -12 + 2x Then, you can add all of the x's together to make it simplified, getting: 15x + 12 < 10 Then, take 12 away from each side, and divide by 5. I hope I helped you!
February 3, 2009

accounting
o How are entries made under each type of accounting? o How does each type of accounting handle depreciation, if at all? o How is inventory accounted for? o Are there any differences between the organizations that adopt a particular accounting method? o What are the strengths ...
February 2, 2009

math
Three students from grades 10,11 and 12 were elected to the student council. Grade 10: Tom(T), Sally(s) and Bill(B) Grade 11: Jerry(J),Anne(A)and Connie(C) Grade 12: Dan(D), Martha(M) and Gwen(G) A three member committee is to be formed with one person from each grade. All ...
January 30, 2009

chemistry
Thanks! But, does this rule apply to any molecular compounds. I noticed that for H2O, H2S, H2Se H2Te, the rule applies to H2S to H2Te but is different for H2O. Why is that??
January 29, 2009

chemistry
What is the relationship between the molar mass of Ne, Ar, Kr, and Xe and the melting points of their solids?
January 29, 2009

3rd grade
My nana has this thing called bells palsy which makes one side of her face hang down.She can't move her mouth and her eye won't close.we are learning about nerves and I need to know which nerves make her smile the motor nerve or sensory nerve.She is sad because she can...
January 25, 2009

Math
draw a quadrilateral that has 1 pair of parallel sides and 2 right angles. What is the name of this shape?
January 22, 2009

history
hey so for question 3 i would go with a b/c while North, Central and South America against European conquest with the Monroe Doctrine...it wasn't what we did for the ENTIRE 19th century. We got involved with Hawaii, Latin America, and Cuba...all countries that were having ...
January 19, 2009

history
I looked in my AP American textbook and it says that "The liberty-loving Filipinos assumed that they, like the Cubans, would be granted their freedom after the Spanish-American War. They were tragically deceived. Washington excluded them from the peace negotiations with ...
January 19, 2009

history
So for number 1 I would go with b... question 2 I went with b because "antiquated" means old fashioned and wedidn't have old equipment to handicap us...and question 3... I'm sorry I'm not sure about that one but I'll try looking for it! When I find ...
January 19, 2009

US History
Ok thank you everyone! I think it is the UUS Maine now! You're right it involved Spain more. And the Ostend Manifesto I was a secret document written in 1854 by U.S. diplomats at Ostend, Belgium, describing a plan to acquire Cuba from Spain. Thanks so much everyone! :)
January 19, 2009

US History
Hi i have a question... Which of the following did not involve relations between the United States and Cuba? a) Ostend Manifesto b) Platt Amendment c) the U.S.S. Maine d) missile crisis, 1962 e) Roosevelt Corollary Didn't all of these involve relations between the United ...
January 19, 2009

us history
True or False President Taft's secretary of the interior, Richard A. Ballinger, disapproved of conservationist controls of western lands?
January 17, 2009

Poem
i think that was a great poem!you are one of the kind.i loved the poem.i think it should be in a book.
January 15, 2009

5th grade
whats the synonym and antonym for privateers
January 15, 2009

college algebra
factor each polynomial m4-81
January 13, 2009

French 4
Acually, the granddaughter is right & the other =]] good jobb
January 8, 2009

9th grade science
Please explain "What happens to moist air as it traveles over the Cascade Range"
January 8, 2009

calculus
in class
January 4, 2009

calculus
I totally don't understand this part: so area = 2[integral] (-x^2 + 27)dx from 0 to 3 = 2[(-1/3)x^3 + 27x] from 0 to 3 = 2[-9+81 - 0] = 144
January 4, 2009

calculus
Find the area of the largest rectangle (with sides parallel to the coordinate axes) that can be inscribed i nthe region enclosed by the graphs of f(x)=18-x^2 and g(x)=2x^2-9. Is it equal to about 67.67? I have no idea finding the answer by using max or min. Can anyone please ...
January 4, 2009

English
What does it mean by "... Old fools are babes again ..."? Please explain to me!!! THANKS A LOT!
January 1, 2009

5th grade - Math
i need help on my end of the year exam can you help me on inputs ouputs
December 16, 2008

English
I think evening and celebration are the only nouns. Am I right?
December 8, 2008

English
What are the nouns in this sentence? Friday evening will be Ivy's birthday celebration.
December 8, 2008

12th grade chemistry!!
All elements on the table are trying to get to the 8th column. Metals on the periodic table lose electrons. An example is aluminum. Aluminum needs three in order to reach the far right of the table. Don't move right, count three to the left. So you write Al +3. This is a ...
December 7, 2008

Math 6th grade
how to 1.2/0.5=_____
December 2, 2008

Genetics
Hi, I'm just trying to learn gene mapping and I'm a bit confused as to why the answer this question is D. I just don't get it, and I'd really appreciate it if someone could help work it through so I'd understand how they got that answer to be wrong and the ...
November 29, 2008

Literature
How does the water symbology in Whitman's poetry connect to his philosophy on Transcendentalism?
November 22, 2008

Math
Power Plant on the River Problem As the construction manager for the Lightem Up Power Company , you make decisions to hep minimize costs of the company's construction projects. Today you've been asked to determine the path of a pipe that will house communication lines ...
November 17, 2008

3rd grade music
saturday november 15 ' 2008 at 5;20pm
November 14, 2008

math/geometry
the area of one triangle is 9dm^2 and its perimeter is 4x-4. The area of a similar triangle is 4dm^2 and its perimeter is 2x+6. Find the perimeter of each triangle.
November 11, 2008

math/geometry
got it!
November 11, 2008

math/geometry
What are the surface areas of this two figures? a) a triangular pyramid with base of 5 cm, an altitude of the base of 8.7 cm and a slant height = 6.9 cm b) a square pyramid with a slant height of 5.2cm and an altitude of the triangle of 9cm.
November 11, 2008

sci 275
A brief description of the terrestrial resource issue. My work is done I just need a brief discription, please!
November 7, 2008

4th grade Science
Thank you so much! You have saved our life tonight!
November 3, 2008

4th grade Science
My daughter is learning translation and rotation in science right now...what is translation in regards to science?
November 3, 2008

Genetics
Hi guys, Need help with this 3. Crosses between true-breeding yellow-haired Guinea pigs and white-haired Guinea pigs result in progeny that have cream-colored hair. The following data were collected when many pairs of cream-colored F1 Guinea pigs were mated: 42 yellow-haired ...
November 1, 2008

science
what is 303ml=______dal
October 29, 2008

Physics Number 3 (Online w/ no teacher)
drwls.. what do you mean about Jiskha teachers? No I mean at the college I go to I'm taking this class online, and the teacher is not helpful at all, even when we ask questions. Thank you.
October 27, 2008

Physics Number 3 (Online w/ no teacher)
Many people mistakenly believe that the astronauts that orbit the Earth are “above gravity.” Calculate g for space-shuttle territory, 200 kilometers above the Earth’s surface. Earths’ mass is 6 X 10 to the 24th and its radius is 6.38 X 10 to the 6th (6380 ...
October 27, 2008

Physics (Online w/ no teacher)
Thank you both!
October 27, 2008

Physics (Online w/ no teacher)
The mass of a certain neutron star is 3.0 X 10 to the 30th (1.5 solar masses) and its radius is 8,000 m (8 km). What is the acceleration of gravity at the surface of this condensed, burned-out star? My answer was 31,265,625 X 10 to the 12th km/s squared.
October 27, 2008

Physics (Online w/ no teacher)
That's what I believe it is, but I'm not sure... ?
October 27, 2008

Physics (Online w/ no teacher)
Find the change in the force of gravity between two planets when the distance between them is decreased by a factor of 5.
October 27, 2008

math
7x-4y=-10 4y=x-2
October 26, 2008

math
5x+y=2 5x+3y=12
October 26, 2008

9th grade biology honors
What would happen if you placed a grape in a bowl with highly concentrated sugar water? and also i need help with this question: "Talking about osmosis, what would happen to a jellyfish placed in a freshwater lake?
October 16, 2008

Precalculus
Why x can't be negative? Isn't it just y that can't be negative?
October 14, 2008

Precalculus
How would you determine whether |y|= x^3 is symmetric with respect to the x-axis, y-axis, both, or neither. In my book it said to plug in (a,b) and to get an equation to compare the other ones to. So I got |b|= a^3. Then I plugged in (a,-b) to test the x-axis and (-a,b) to ...
October 14, 2008

science
three statements that define all living things in terms of cells
October 14, 2008

Chemistry
no one has answered this question
October 13, 2008

Math
a fruit seller has a roadside stand that can hold thirty baskets on it. He can put ten apples in a basket, or two watermelons at a time. if he makes $0.50 on each apple, and $2.00 on each watermelon, how many of each should he carry? How much will he make?
October 9, 2008

Math
How do you not get mixed up with the exponents?
October 6, 2008

american history
what are Haciendas
October 2, 2008

MicroEconomics
Thanks for the info, much appreciated:)
September 26, 2008

MicroEconomics
One of the early economic laws was called Says Law that stated that supply creates its own demand. Using the circular flow chart, explain what this means and how an expanding population results in economic growth.
September 26, 2008

L.A
why don't principles fail??
September 24, 2008

social studies
how do trres give us oxygen and how?
September 19, 2008

social studies
what is the longest river in the north america?
September 18, 2008

world history
What was the relationship between trade and the spread of the Phoenician alphabet?
September 15, 2008

spanish
your answer could not be posted due to the following erros
September 13, 2008

science
why do bubbles released indicates that a chemical change has taken place
September 12, 2008

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