Friday

June 24, 2016
Total # Posts: 1,763

**physics**

The answer should be positive, so 13.82 is correct
*April 24, 2009*

**Science**

How is nuclear radiation produced? What are 3 types of radioactive decay and how do they work? Thanks!
*April 24, 2009*

**Earth science**

How long an exposure would a photographer need to photograph star trails that are complete circles? Why? The star Sirius is 4.3 light years from Earth. Determine the distance to Sirius in km and in astronomical units. THe moon's average distance from Earth is about 380,000...
*April 19, 2009*

**Earth Science**

Using Kepler's equal area law, explain why the speed of an object in a perfectly circular orbit is constant. HELP!!!!!!!!!!!!!!
*April 19, 2009*

**Calculus**

Never mind, I figured it out-- he rationalized the denominator.
*April 14, 2009*

**Calculus**

This is a problem we did previously on a test; my answer was marked correct, but I am having trouble getting my answer in the same form that my teacher gave it. The question: Find the derivative of (x/(x+1))^1/2 His answer: ( (x(x+1))^(1/2) ) / (2x(x+1)^2) My answer: ((x+1)^(1...
*April 14, 2009*

**Calculus**

Show that the function f(x)= x^(3) +3/(x^2) +2 has exactly one zero on the interval (-infinity, 0). So far this is what I have: 0=x^3 + 3/(x^2) +2 -2= (1/x^2)(x^5 + 3) -2x^2= x^5 +3 But now I'm stuck. I also am not sure if this is how I'm supposed to be solving the ...
*April 12, 2009*

**Calculus**

Thank you! That makes more sense... because you would say f' of g of x.... so 1/3 of 2 = 2/3. That makes sense!
*April 1, 2009*

**Calculus**

I finished this problem but I wanted some feedback because I don't know if it's entirely correct. Suppose that functions f and g and their derivatives with respect to x have the following values at x=2. f(x)=8 g(x)=2 f'(x)=1/3 g'(x)=-3 Find d/dx of f(g(x)) at x...
*April 1, 2009*

**Calculus**

I have a two part question that pertains to a curve (r(x)) and its tangent line at x=3. We are given that at x=3, r(x)=8. In order to find the slope of the tangent line, we are given another point (on the tangent line): (3.2, 8.5). Therefore the slope of the tangent line at x=...
*March 31, 2009*

**CHEM..URGENT!**

At the anode, the oxidation of bromide ions (1.07 ) occurs because it has a higher (less negative) potential than the oxidation of water (1.23 ) or fluoride ions (2.87 ). The product of the oxidation of bromide ions is liquid bromine. At the cathode, the reduction of silver ...
*March 30, 2009*

**Statistics**

Ummm, guiding our thinking doesn't work. I'm student teaching right now and I've been a student for year, sometimes you have to give the student the answer in order for them to figure out for themselves WHY it is right.
*March 29, 2009*

**Physics**

A child twirling a 0.0120kg ball on a string in a horizontal circle parallel to the floor. The radius of this circle is 0.358m. The ball traveling once around the circle is 2.08 seconds. a)Determine the centripetal force acting on the ball. b) If the speed is doubled, does ...
*March 25, 2009*

**Chemistry**

Which liquid is more viscous at room temperature water or molasses? explain
*March 22, 2009*

**US HISTORY.**

Why did farmers express discontent during 1870-1900 and what impact did their new attitudes and actions have on national politics?
*March 8, 2009*

**chemistry**

DrBob222 do you think you can help me figure these out please. On #4 would I do 12.2g x 35.0g= ??
*March 4, 2009*

**chemistry**

1) 4.20 x10^6 ml + 12.3 x 10^2 L= My answer is 4.21 x 10^9 2) Change 17.7 L to cubic meters? My answer 1.77 x 10^3 3) Draw an electron dot diagram for K3PO3 My answer K O P O O I couldnt do the dots but there should be 26 dots right? 4) A 35.0 g sample of a carbon-oxygen ...
*March 4, 2009*

**Science/Math**

1km= 1,000 meters 1,000 meters/4= 250 250/1.5= 166.6666666 (and so on) years
*February 27, 2009*

**Science/Math**

1/4 of 1km is 250m
*February 27, 2009*

**geometry**

What is the circumference of a circle circumscribed about a square with a side length 24 m?
*February 26, 2009*

**Chemistry**

Thanks!
*February 25, 2009*

**Chemistry**

I did an experiment to determine the freezing point depression and then find the molecular weight of the unknown solute added to the solvent, what would be the effect on calculating the molecular weight if some cyclohexane(my solvent) evaporated while the freezing point of the...
*February 25, 2009*

**english**

can anyone tell me what is a proper sentence
*February 22, 2009*

**calculus**

how do you integrate 30x^2/(x-2)(x+3)(x-5)
*February 17, 2009*

**calculus**

how do you integrate 30x^2/(x-2)(x+3)(x-5)
*February 16, 2009*

**calculus**

how do you integrate dx/(x^2*(x^2+4)^1/2)
*February 16, 2009*

**math**

how do you integrate dx/(x^2*(x^2+4)^1/2)?
*February 15, 2009*

**math**

how do you integrate 30x^2/((x-2)(x+3)(x-5)) using partial fraction decomposition
*February 15, 2009*

**physics**

4.8mF capacitor in series with 500 ohm resistor is connected, via a switch, to a 12V battery. What is the current through the resistor at t=1.0s after the switch is closed? I tried doing I^2R = 1/2 CV^2 and solving for I but the answer wasn't correct. can some1 please help...
*February 13, 2009*

**math**

what would the antiderivative of e^-2x be? and if the antiderivative of that is -1/2e^-2x, what would that antiderivative be?
*February 12, 2009*

**10th grade Chemistry**

What is an organic substance found in a dna molecule that is a weak base?
*February 11, 2009*

**Chemistry**

Wrong^ The eq. point will be below 7 because the Ka is greater than the Kb --> [H+] is greater than [OH-].
*February 4, 2009*

**algebra**

Lin's garden has an area of 782 square feet. The length of the garden is 5 less than three times its width. What are the dimensions of the garden?
*February 4, 2009*

**chem**

Is this how you write a skeleton equation i dont understand this Lithium(s)+gold(III)chloride(aq)= Lithium chloride(aq)+gold(s) iron(s)+tin(IV)nitrate(aq)= Iron (III) nitrate(aq)+tin (s)
*February 1, 2009*

**Chemistry**

How would you write skeleton equations for these reactions Lithium(s)+gold(III)chloride(aq)= Lithium chloride(aq)+gold(s) iron(s)+tin(IV)nitrate(aq)= Iron (III) nitrate(aq)+tin (s)
*February 1, 2009*

**Chemistry**

How would you write skeleton equations for these reactions? I am very confused Hydrogen iodide(G)= Hyrdrogen(G)+Iodide(G) Aluminum(s)+iodines(s)= Aluminum iodide(S) Silver Nitrate (aq)+Sodium sulfide (aq)= silver sulfide(S)+ sodium nitrate (aq)
*January 31, 2009*

**Chemistry**

How would you balance this equation Mg(s)+FeCl3(aq)=Fe(s)+MgCl2(aq)
*January 31, 2009*

**Introduction to Psychology**

Okay I have to do short paper on my results for a survey that I did to determine which branch of psychology I would be best suited for. My results were Behavioral: 20, Humanistic: 20, and Psychoanalytical: 17. I think my main problem is getting all of the information I need ...
*January 30, 2009*

**chemistry**

Solid zinc and aqueous hydrogen sulfate reacts to produce hydrogen gas and aqueous zinc sulfate Is this the right answer Z(aq)+HS equals H(G) ZS? if not can u please correct me
*January 26, 2009*

**Chemistry**

how do you write a chemical equation with this reaction? can u help me solve these 1.Liquid carbon disulfide reacts with oxygen gas, producing carbon dioxide gas and sulfur dioxdie gas. 2. Solid zinc and aqueous hydrogen sulfate reacts to produce hydrogen gas and aqueous zinc ...
*January 26, 2009*

**11th grade Art**

What is keyhole painting? Could you help me with analysing an artwork. What information should I give.
*January 23, 2009*

**English**

Oh thank you! It wasn't easy but once I figured it out life became fabulous again! :) Thanks again! Have a great night!
*January 20, 2009*

**English**

Yeah I know! It is really hard for others to understand that. The first three months were horrible because I just kept thinking "why me?" which I'm not normally like! But then after my three month check-up I started thinking about how I was handling things and ...
*January 20, 2009*

**English**

Thanks so much guys! My essay is about how everyone is the master of their own fates and I am giving an example of how I learned this valuable lesson. I had to have jaw surgery and at first I was miserable and wasn't acting like my normal bubbly cheerful self, but then how...
*January 20, 2009*

**English**

Yeah I know I think it fits perfectly too but I am trying to avoid using it...it's really frustrating trying to think of something else though! Would "Eight miserable months" or "Eight long, painful months" work? Or do you think I should just stick to &...
*January 20, 2009*

**English**

So I'm working on an english paper but I've been stuck the past hour on what to do. I'm trying to take my teachers advice by putting in an anaphorism (repeated words or phrases)but I'm having trouble. I'm repeating the phrase "eight months" but I...
*January 20, 2009*

**litureature**

In emphasizing the importance of individual thinking and basing one's beliefs on one's own experiences, Sujourner shows she has much in common with
*January 16, 2009*

**english essay**

i need help with figuring out the satirization of Huck Finn. such as with the word choice/ dialect he uses and the irony in the book.
*January 12, 2009*

**Intermediate Algebra**

Find the maximum value of the objective function and the values of x and y for which it occurs. F = 5x + 2y x + 2y (greater than or equal to) 6 2x + y (greater than or equal to) 6 Both x and y are greater than or equal to 0. I don't understand how to do this! And I can'...
*January 12, 2009*

**randon question that needs an answer**

how many years apart is it leagle to marry like can u be 27 but marry sum1 that is 32? or 19 but marry sum1 that is 24? like how many years apart ...can u be 5 years apart and still marry the person? is that leagle?
*January 11, 2009*

**2nd grade Math**

Wich 3 flowers add up to 85 cents? Tulip-48 cents Rose-52 cents Dafidale-25 cents Viloit-37 cents Sunflower-23 cents
*January 7, 2009*

**5th grade math**

something is missing hunn.
*January 6, 2009*

**US history**

i dont know estabished credibility?
*January 5, 2009*

**US history**

How did the Supreme Court decisions mentioned (Marbury v. Madison, McCullough vs. Maryland, and Martin v. Hunter's Lessee) strengthen the American republic?
*January 5, 2009*

**Precalc**

What does something have to be inorder to be considered a function. I'm not talking about the verticle line test or somethng to verify, im saying in words. like can it not be negative or somehting?
*January 2, 2009*

**PreCalc**

I am supposed to graph this y= -x^2+2x he told us to coplete the square to get us the vertex, but how do i complete the square with a - in front of the x^2??
*January 2, 2009*

**9th grade**

what is one obstacle that both martin luther king and richard wright address in i have a dream and black boy.
*December 18, 2008*

**Chemistry- Please help me**

A sample consisting of 22.7 g of a nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00 cm, and a piston is carefully placed on the surface of the compound so that, for all practicla purposes, the distance between the bottom of the cylinder ...
*December 16, 2008*

**english**

I have trouble finding the tone of this piece by Aristotle. Seeing then that the state is made up of households, before speaking of the state we must speak of the management of the household. The parts of household management correspond to the persons who compose the household...
*December 14, 2008*

**Math**

How would I rewrite 3(x + 2) in Distibutive property?
*December 14, 2008*

**CSS Coding**

yeah I know this stuff from neopets. Its not top then height, its to then left.
*December 13, 2008*

**Spelling**

Thank you yay now I can lern how to spell. By teacher will be happy that I can finaly spell!!! why did you giv me da first link?
*December 13, 2008*

**Maths**

sorry I typed the rong subject. Its suposed to be called spelling
*December 13, 2008*

**Maths**

hello my name is lauren and I am in year 6. I don't no how to spell goodly do you have any tips on how to spell better? Thank you very much.
*December 13, 2008*

**Chem: Mole and Avogadros Number**

How many molecules are in the quantities below? 2.0 moles 0.75 moles
*December 11, 2008*

**Science**

at absolute zero, how much kinetic energy do the particles have?
*December 10, 2008*

**Science**

what is the difference between the average kinetic energy of an object and the total kinetic energy of an object?
*December 10, 2008*

**us history**

were immigrants lived ad worked during the 1920's
*December 3, 2008*

**physics**

a coin rests on a book. the book tilts until the coin just begins to move. the angle is 17 degrees. what is the coefficient of static friction?
*December 2, 2008*

**Math**

Thank You, I saved this link.
*November 30, 2008*

**Math**

Thank You, how can you find a square root of a number easily?
*November 30, 2008*

**Math**

Find all the numbers that give you 7.29 when squared. Show your work.
*November 30, 2008*

**Math word problem**

Thank You so much. It looks so simple, and makes sense the way you wrote it out!
*November 30, 2008*

**Math word problem**

I know the answer, but is there a formula to show work? Amy had a piece of wire 96 inches long. She cut the wire into 3 pieces. The second piece was 6 inches longer than the first piece. The third piece is 9 inches longer than the second. What was the length of each piece of ...
*November 30, 2008*

**math**

A word Problem Kris has an endless supply of 4-cent and 7-cent stamps for mailing a package. What is the greatest amount of postage that cannot be affixed to a package using these stamps?
*November 16, 2008*

**science**

What does ti mean to depress the scapula? Does that mean to shrug shoulders?
*November 8, 2008*

**physics again (check answers please)**

What net force increases a velocity of a car from 20 m/s to 35 m/s in 8.0 s if the mass of the car is 1600 kg? (3000 N). What force would cause the car to stop? (3000N) What coefficient of friction is needed to supply the force of friction? (.0191) are they correct?
*November 8, 2008*

**physics- check my answers)**

thanks!
*November 8, 2008*

**physics- check my answers)**

An ice skater of mass 50kg moving at 10 m/s coasts to a halt in 100 m on a smooth ice surface a. calculater acceleration of the skater (.5 m/s) b. what is the force of friction between the ice and the skates? (25 N) c. calculate the coefficient of friction (.051) are my ...
*November 8, 2008*

**math**

a rectangular box with a volume of 60 ft^3 fas a square base. Find a funtion that models its surface area S in terms of the length x of one side of its base
*November 8, 2008*

**gov**

what does collective action have to do with interest groups?
*November 7, 2008*

**math**

[(2+h)^2-4]/h find the limit how do i do this?
*November 6, 2008*

**Intro to Computer Programming - Pseudocode**

This assignment (below) jumped way ahead of my abilities compared to the last assignment. I think I need a parallel array or a 2D array, an accumulator or loop counter, a verification of input, and Boolean something. But I'm not sure how to write it. We're not writing ...
*November 3, 2008*

**Interview**

You want to dress in a way that shows you are mature and care about how you look. So, I would say something dress-casual. Wear nice but comfortable shoes. You want your appearance to make people take you seriously, but not be overdone (don't draw attention to yourself by ...
*November 3, 2008*

**spanish**

Please see if this is written correctly. Let me know what to fix. Thanks. Michelle Rodriquez es puertorriqueña y dominicana. Ella es famosa por las habilidades de actuación. Ella es rebelde y hace los papeles de unas muchachas gamberras en películas de ...
*October 28, 2008*

**Spanish**

Please see if this is written correctly. Let me know if I can say certain sentences in shorter phrases or simpler words or both. Michelle Rodriquez es puertorriqueña y dominicana. Ella es famosa por ella las habilidades actuación. Ella es rebelde y de muchachas ...
*October 27, 2008*

**math**

For how many ordered pairs of positive integers (x,y) is 2x+3y<6? a. One b. Two c. Three d Five e Seven
*October 27, 2008*

**Spanish**

Hello: Please see if this translation is correct. Make suggestions as necessary or feel free to tell me how to say specific phrases in simpler words. Thanks. Michelle Rodriquez is Puerto Rican and Dominican. She is famous for her acting skills. She is rebellious and usually ...
*October 27, 2008*

**Science**

Why is water used as a contant in many science experiments?
*October 23, 2008*

**5th Grade Math -- Correction**

what is the answer for 27 metres and 16 cm plus 13 metres and 58 cm
*October 23, 2008*

**Pre-Cal**

Find the greatest integral upper bound of the zeros for the following function. f(x) = 4x^3 - 2x^2 - 12x + 1 Find the real zero(s) to the nearest tenth. f(x) = 2x^3 + x^2 - 1 [I believe the numbers should be around -1 and 0 and 0 and 1.]
*October 22, 2008*

**Spanish**

please see if this is correctly written. Judith Baca, un habitante de Los Angeles nativo, nació en 1946. Ella es sabida mejor para sus murales grandes. La Gran Pared de Los Angeles representa la historia de personas étnicas de California. El mural muestra im&...
*October 22, 2008*

**pre-cal**

Solve. (sqrt. x + 1) - (sqrt. 2x -12) = 1 The answers I reached were x = 8 and 24. If you plug in 8, you will get 1 as an answer. If you plug in 24, however, you will not get 1 as an answer. Please see if 8 is the only solution. If not, please show me how to solve to find the ...
*October 21, 2008*

**physics...one last time**

A mortar elevated to 60 degrees scores a hit 15 m up a building 30m away. with what speed was the shell fired?
*October 21, 2008*

**physics again!!**

and...the time is 3.06s
*October 21, 2008*

**physics again!!**

An arrow is fired at an angle of 53 with a velocity of 15 m/s. what is its range? explain step by step please!!
*October 21, 2008*

**Physics HELP!!!**

nevermind, i figured it out
*October 21, 2008*

**Physics HELP!!!**

thanks! I have question though...what happened to the ^2 in the second part? Its in the second step but then where does it go?
*October 21, 2008*

**Physics HELP!!!**

A ball is kicked at an angle of 50 with a velocity of 14m/s. a. how long is it in the air? b. how high does it rise? can someone please explain to me how to solve this???
*October 21, 2008*

**7th grade math**

the sum of two integers is zero. the difference of the same two integers is 16. What are the integers
*October 20, 2008*