Sunday

December 21, 2014

December 21, 2014

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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