# Posts by Lauren

Total # Posts: 1,828

**Physics**

A model electric train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the primary is connected to a 120 V household circuit?

*November 10, 2009*

**physics**

How can you easily increase the magnetic field strength inside a current-carrying coil?

*November 10, 2009*

**art**

during what years did boticelli visit rome

*November 9, 2009*

**writing ASAP-.**

i'm work on a book project on ameila earhart.The queston on my book report is ...How is the provied by the author imporant or relatable to today's modern society ?Please tell what this means and give an example.

*November 7, 2009*

**Physics**

How do you divide 4.0 V by .041 A? Would the answer be: 97.6

*November 4, 2009*

**Physics**

Is the answer 30?

*November 2, 2009*

**Physics**

The voltage across a 10-ohm resistor carrying 3 amps must be?

*November 2, 2009*

**Statistics**

pls help

*November 1, 2009*

**National and State Government**

How did the Civil Rights Division of the Department of Justice operate during the George W. Bush administration?

*October 30, 2009*

**History**

Which political faction would Obama have fallen under: Federalist or Jeffersonian?

*October 27, 2009*

**Physics**

Is the answer F subscript elec F subscript grav = (8.22 x 10 subscript -8) (3.63 x 10 subscript -47) = 2.26 x 10 subscript 39

*October 26, 2009*

**Physics**

How do you calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10 to the negative 10 m. Is the answer: m x a = (4p2r/t2)= 10 - 30 x 4 x1021= 4x10

*October 26, 2009*

**9th grade(math)**

the product is two times m

*October 23, 2009*

**Trig**

Oh, so basically.. I would subtract 2pi, which gives me 11pi/6. The cos of 11pi/6 is sqrt(3)/2. Since the sec is 1/cos(23pi/6), it would also be 1/(sqrt(3)/2)? Simplified, that gives me a final answer of 2sqrt(2)/3, which is the answer I was looking for. Thank you for your ...

*October 22, 2009*

**Trig**

Find the exact circular function value for: sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to solve the problem. I have a unit circle, but 23pi/6 is not on it, so I don't know how to find the (x,y)

*October 22, 2009*

**home economics**

HBV protein is a type of protein that comes from animals like the protein in liver or beef and it contains all the essential amino acids and in the correct proportions. LBV is protein from vegetable products like lettuce.

*October 22, 2009*

**Math**

greater than 30 but less 40 and if you add the digits you get a sum of 10. What is the number word? greater than 7/10 tens but less than 8/10 tens the number has 4 ones, what is the number word? I have more but will wait for these first, thanks. This is to try and help my ...

*October 21, 2009*

**algebra**

what is 1.59x+4.23=3.56x+2.12

*October 21, 2009*

**chemistry**

I still do not understand how to figure out this problem yet? 6FeO3----->4Fe304+02 DELTA H=+ 392kj If 2.83 g of Fe2O3 decomposed according to the above reaction , how many kj of heat would be exchanged with the enviroment? chem - DrBob222, Thursday, October 15, 2009 at 11:...

*October 15, 2009*

**chem**

6FeO3----->4Fe304+02 DELTA H=+ 392kj If 2.83 g of Fe2O3 decomposed according to the above reaction , how many kj of heat would be exchanged with the enviroment?

*October 15, 2009*

**4th grade**

if a=11 b=2 c=18 then what does a+c-b=?

*October 8, 2009*

**Calculus**

wow im sorry, this was a lot easier than i thought

*October 6, 2009*

**Calculus**

y = ln(3x+5), then d^2y/dx^2 = a. 3/(3x+5) b. 3/((3x+5)^2) c. 9/((3x+5)^2) d. -9/((3x+5)^2) e. -3/((3x+5)^2)

*October 6, 2009*

**Calculus**

f(x) = sq.root(e^2x+1), then f'(0)= a. -sq.root(2)/2 b. sq.root(2)/4 c. sq.root(2)/2 d. 1 e. sq.root(2)

*October 6, 2009*

**Math**

Pages are 30 and 31 30x31=930

*October 5, 2009*

**AP Physics Halley's Comet**

Halley's expected return....

*October 2, 2009*

**AP Physics Halley's Comet**

Yes, it is still in the solar system. Halley is one of those comets with orbits in the planetary system. It's periodic returns demonstrates that is was in orbit around the sun and that some comets are members of the solar system. Halley's expected reurn to the inner ...

*October 2, 2009*

**math**

You must earn $115 $292 +193 + 115=600 $600 divided by 3= 200

*October 1, 2009*

**math**

5 out of 26 for drawing a vowel

*October 1, 2009*

**math**

It is 126 Least common multiple is the lowest number that can be divided by any two or more numbers evenly

*October 1, 2009*

**algebra 1**

Rewrite expresson using only postive exponents 2ab^3c-^3

*September 29, 2009*

**french help please=)**

To Mk- he was my one and only dog and he was small and weak

*September 29, 2009*

**french help please=)**

urg. i don't understand why my accents are not working=/

*September 29, 2009*

**french help please=)**

Hmm.. okay. I had to use another laptop hopefully this will work. J'adore les animaux, surtout les chiens. Il y a deux ans quand j'ai rencontré mon premier and seulement chien. Il a été petit et faible. Il a un gros nezmais les fourrure bruns et ...

*September 29, 2009*

**french help please=)**

Can someone see if I wrote this correctly? J’adore les animaux, surtout les chiens. Il y a deux ans, quand j'ai rencontré mon premier et seulement chien. Il a été très petit et faible. Il a un gros nez mais les très petits yeux noirs...

*September 29, 2009*

**math**

6 X 2= 12. 2/6=1/3.

*September 28, 2009*

**math**

how do I do 84m 15cm to centimeters?

*September 28, 2009*

**Science!**

CuCO3 + O2 -> CuO + CO2 hydrogen peroxide + manganese dioxide -> hydrogen + oxygen copper (II) sulfate pentahydrate + oxygen -> copper oxide + sulfur trioxide + dihydrogen monoxide What are the balanced queations for these?

*September 28, 2009*

**math**

what is 38.29 seconds in decimal form?

*September 23, 2009*

**Chemistry**

iaj;ldsk

*September 19, 2009*

**Science -- same q, dont reply if you dont know!**

Thank you so much! I appreciate it :)

*September 17, 2009*

**Science -- same q, dont reply if you dont know!**

Alright, so I'm doing a lab report, and I have this word equation: iron (III) nitrate + sodium hydroxide --> iron (III) hydroxide + sodium nitrate I would like to turn this into a balanced equation, and I have: Fe(NO3)3(l) + 3NaOH(l) --> Fe(OH)3(s) +3NaNO3(l) (the ...

*September 17, 2009*

**Science**

Alright, so I'm doing a lab report, and I have this word equation: iron (III) nitrate + sodium hydroxide --> iron (III) hydroxide + sodium nitrate I would like to turn this into a balanced equation, and I have: Fe(NO3)3(l) + 3NaOH(l) --> Fe(OH)3(s) +3NaNO3(l) (the ...

*September 17, 2009*

**physics**

greg

*September 15, 2009*

**Calculus**

solve: 14. ln(1/x) = -2 16. lnx + ln(x+2) = ln(x+6) 22. ln(lnx) = 1

*September 14, 2009*

**9th grade, SOSE**

Was world war two hitlers war?? if so why.

*September 13, 2009*

**Calculus**

a particle starts at time t = 0 and moves along the x axis so that its position at any time t>= 0 is given by x(t) = ((t-1)^3)(2t-3) a.find the velocity of the particle at any time t>= 0 b. for what values of t is the velocity of the particle negative? c. find the value ...

*September 10, 2009*

**math**

Find the representation of the number 256 in the following bases: a. base six b. base twelve c. base two I get how to write the number of objects as a base(whatever), but I think this is asking me to start from the end number and work backwards. I really need help. I have two ...

*September 3, 2009*

**world history**

Source-(The event which finally triggered war came on 28th June in Sarajevo, a town in the Austro-Hungarian Provence of Bosnia) How important was the assassinations of the Archduke Franz Ferdinand and his wife in causing the First World War? (5 marks)

*September 2, 2009*

**Math**

What do they call the international hula hoop championships?

*September 1, 2009*

**Math**

What do they call the international hula hoop championships?

*September 1, 2009*

**French part 3**

Could you please check these thanks Directions: Indicate whether each of the following statments is true or false. 1. Il faut passer par le controle de sécurité avant le vol. Answer: vrai 2. On peut laisser ses bagages à main dans le couloir pendant le vol...

*August 30, 2009*

**French part 2**

Could you check these please thanks Directions: Choose the correct verb to complete each phrase. Here are the verbs you can choose: passer, enregistrer, sortir, remplir, servir, choisir, and attacher. 1. -------- une place coté couloir. Answer: Choisir 2. ------- par le...

*August 30, 2009*

**French**

could you please check these thanks. Directions: Indicate whether each of the following statements are true or false. 1. Avant de monter en avion, on passer par le controle de sécurité. Answer: Vrai 2. On sert un repas pendant un vol transatlantique. Answer: Faux...

*August 30, 2009*

**quick science question**

What are some ways in which genetics collect samples to test for disorders?

*August 28, 2009*

**Geography**

Five Geographic Themes: What is the place of Moscow, Russia?

*August 23, 2009*

**math!**

hi im lauren and i have a big math test tomorrow(7th grade) and i need 2 know wht interval means. And i need the expalnation 2 be so simple that a little kid can understand it. lol. Can someone answer like in the next 10 mins plz! thx!! hurry peeps!!lol

*August 20, 2009*

**english**

Which of the following statements BEST explains why "I Am Offering This Poem" is considered a lyric poem? A. It is a simple poem that tells a story. B. It is a tragic poem that teaches a lesson. C. It is a short poem that expresses strong emotion. D. It is a rhyming ...

*July 30, 2009*

**healthcare reimbursement methologies from Penn Fos**

Does anyone have the answers to exam #40974000?

*July 1, 2009*

**Health**

How are hospitals that are excluded from the Medicare acute care PPS paid? Are they based on reasonable costs, fee schedules, global payments, or bundled payments?

*June 26, 2009*

**Health**

Who is responsible for paying $250 major medical insurance before a company assumes liability?

*June 22, 2009*

**Music**

What 18th century composer wrote music primarily for the harp?

*June 9, 2009*

**history**

The major conflict(s) that the christian world had with the muslims during the middle ages was/were due to: A:the desire to spread the principiles of the koran B:the desire to form a government, ecenomic, and social system C: religious inspiration to wage war and acquire new ...

*May 30, 2009*

**geometry**

A regular polygon has 12 sides. What is the measure of each EXTERIOR angle?

*May 17, 2009*

**algebra**

-2 x 7 = -3 + t + 24 solution?

*April 27, 2009*

**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 couldn't 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 don't 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*