# Posts by jonathan

Total # Posts: 418

**SCIENCE**

SUNLIGHT AND WIND ARE INEXHAUSTIBLE RESOURCES. EXPLAIN WHY THEY ARENT USED TO PRODUCED ALL OF OUR ENGERY

*April 21, 2010*

**SCIENCE**

SUNLIGHT AND WIND ARE INEXHAUSTIBLE RESOURCES. EXPLAIN WHY THEY ARENT USED TO PRODUCED ALL OF OUR ENGERY

*April 21, 2010*

**Chemistry**

11580sec

*April 18, 2010*

**Organic Chemistry**

What is the white solid that quickly forms when the methyl salicylate is added to the sodium hydroxide solution? I know that it is this equation but I wanted to know what is the name of the white solid: HOC6H4COOCH3 + NaOH „³ HOC6H4COO- Na+ + CH3OH

*April 3, 2010*

**physics**

You have a bathtub containing 100 ml of water at 25 degrees celcius. How long must you stir the water to bring the temperature of the water to 100 degrees celcius?

*March 24, 2010*

**11th grade**

1.44x 10^25 atoms c X 1 mol C / 6.02 x 10^23 atoms C = Type in calc. The atoms cancel out and you have moles =).

*March 12, 2010*

**Math**

How would I find the formual of power function out of these 2 point? (5,75)(10,600)

*March 12, 2010*

**Physics**

I've been working on this problem for quite some time now and still can not figure it out... Initially, both metal spheres are neutral. In a charging process, 1 × 1013 electrons are removed from one metal sphere and placed on a second sphere. Then the electrical ...

*February 16, 2010*

**Physics**

I tried using 1E13 as q1 and -1.6E-19 as q2, and I still got it wrong...

*February 16, 2010*

**Physics**

Initially, both metal spheres are neutral. In a charging process, 1 × 1013 electrons are removed from one metal sphere and placed on a second sphere. Then the electrical poten- tial energy associated with the two spheres is found to be −0.061 J . The Coulomb ...

*February 16, 2010*

**physics**

PLEASE EXPLAIN A charge moves a distance of 1.7 cm in the direction of a uniform electric field having a magnitude of 200 N/C. The electrical potential energy of the charge decreases by 9.69095 × 10−19 J as it moves. Find the magnitude of the charge on the moving ...

*February 16, 2010*

**Physics**

PLEASE HELP WITH AS MANY AS POSSIBLE... I AM TERRIBLY CONFUSED. 1. A charge moves a distance of 1.7 cm in the direction of a uniform electric field having a magnitude of 200 N/C. The electrical potential energy of the charge decreases by 9.69095 × 10−19 J as it ...

*February 16, 2010*

**economics**

Suppose that the consumption function is C=100+.8(y-t). Initially investment and government expendtures are I=75 and G=150 and taxes are T=50. 1.Depict this economy using the keynesian cross. calulate the initial equilibrium income. how much will income increas if government ...

*February 6, 2010*

**Biology**

Please help me list some of the major differences in the process of mitosis as it occurs in higher plants and as it occurs animals.

*February 5, 2010*

**Math**

Gilda ran a 26-mile marathon. About how far would her sister have to swim to use the same number of Calories Gilda used during the marathon?

*February 2, 2010*

**Advanced Functions**

you did it right up until: t = log(920/314) = 0.465, I have no idea how you got those numbers but it's t(log(1.05/.92))=log(1000/300) t(log(1.1141304348)=log(3.3(rpt.)) t(0.057401472)=0.522878745 t=(0.522878745)/(0.057401472) t=9.1092

*January 4, 2010*

**7th grade math**

what is the constant in th

*December 16, 2009*

**Math - Pre- Clac**

Ok thanks, I did make a typo my bad.

*December 14, 2009*

**Math - Pre- Clac**

Prove that each of these equations is an identity. A) (1 + sinx + cos x)/(1 + sinx + cosx)=(1 + cosx)/sinx B) (1 + sinx + cosx)/(1 - sinx + cosx)= (1 + sin x)/cosx Please and thankyou!

*December 14, 2009*

**Math**

The sum of John's age and twice of his son's age is 56. In 8 years time, the son's age will be half of john's age. Find there present ages. Right now I wrote down an equation x+2y=56 and not quite sure what to do next.

*October 31, 2009*

**Science**

4 and 1

*October 4, 2009*

**Math**

if a^2-b^2=10 and a-b=2 what is the vlaue of a+b

*July 9, 2009*

**science**

what are some interesting facts about the sun?

*May 11, 2009*

**science**

Why should you visit the sun? what is special about it?

*May 11, 2009*

**science**

where is the sun located.

*May 11, 2009*

**Government.**

The main reason why the Constitution dealt specifically with the crime of treason was that: A. The framers wanted to prevent all treason in order to protect the democracy. B. Treason was not considered a serious crime before the Constitution was written. C. Treason was a crime...

*April 21, 2009*

**genology**

well they find a way to get close to the valcanoe

*February 14, 2009*

**genology**

well they

*February 14, 2009*

**science**

word containing the word rock with ice only

*January 5, 2009*

**Economics**

Pls advise.. The max units of good A is 180 The max units of good B is 60 In general terms, what happens to the opportunity cost of good A as the output of good A increases? In general terms, what happens to the opportunity cost of good B as the output of good B increases?

*December 16, 2008*

**MATH**

X-4=3x+12 X=? please help

*December 9, 2008*

**rudcing fractions**

10 100

*October 25, 2008*

**physics/math**

A car moves at 12 m/s and coast up a hill with a uniform acceleration of -1.6 m/s^2..What is its displacment after 6 sec.? What is its displacment after 9 sec.?

*October 20, 2008*

**math**

how do i find the raidis of a sphere? sa= 36*22/7 in sq

*October 16, 2008*

**Macroeconomics**

I have an assignment question regarding the impact of reducing the government's budget deficit by reducing government purchases. I have to develop a S/D graph with curves to illustrate this impact. I know that when the government makes purchases and runs a deficit, supply ...

*October 2, 2008*

**Math!!!**

kk ty bro

*September 27, 2008*

**Math!!!**

A=(-7,-18),B=(3,y),C=(x,6) and the slope of the line=3/5 x=? y=?

*September 27, 2008*

**math**

using the terms factor,divisor,multiple,product,and divisible by,write as many statements as you can about the number sentence 4x7=28.

*September 15, 2008*

**Math - Factors**

using the terms factor,divisor,multiple,product,and divisible by,write as many statements as you can about the number sentence 4x7=28.

*September 10, 2008*

**math**

5x+1=6 x=?

*September 4, 2008*

**Math**

Do i mulitply the equation my 5,3?

*August 23, 2008*

**Math**

One-third the sum of a number N and 5 is 2 more than one-fifth the sum of N and 3. N= ?

*August 23, 2008*

**PreCalc**

What is the real solutions of this equation? sqrt(2x+3)-sqrt(x+2)=2

*August 16, 2008*

**Math**

thank you!

*July 26, 2008*

**Math**

When a rock is put into a tank full of water, water is displaced and is collected by a container. If the base of that container is 12cm x 15cm and the water level is 4.5 cm, what is the volume of the rock?

*July 26, 2008*

**Redox Half Reactions**

Half reaction of 2 Al2O3 + 3 C → 4 Al + 3 CO2

*May 24, 2008*

**Aluminium Bauxite (is water needed)**

Is water needed in the extraction of aluminium from bauxite in either the Bayer or Hall-Heroult proccesses? Please reply as soon as you can :) hehe

*April 20, 2008*

**Maths**

i knew that was wrong, coz my answer should be in the 50's haha..thanks though, great help can i ask how you got sinA and sinB with that information :) no point in me just copying it i would like to know how you got it

*April 17, 2008*

**Maths**

well, i got: (-4/5)(12/13) - (4/5)(7/13) therefore (-48/65) - (28/65) therefore: answer = (-76/65)

*April 17, 2008*

**Maths**

yeah that's right, can u go on?

*April 17, 2008*

**Maths**

if cosA = 4/5; sin <0; cosB = 12/13; 0<B<90, determine sin(A-B) thanks ... :)

*April 17, 2008*

**Science**

I desperatly need help, i need to know everything there is to know about the recovery of ALUMINIUM that is recovered from BAUXITE ORE, the process, the cost, everything. Please, if you have any knowledge or know of any GOOD webpages, please post them here. thanks:)

*April 17, 2008*

**science**

What is the difference between RNA and DNA that can be used to separate them from one another?

*April 9, 2008*

**Math**

Factorise: a)x squared - 5x b)x squared - 81

*April 7, 2008*

**geography**

name at least two state capitals that have two or more words in their names

*April 2, 2008*

**Chemistry**

What are compunds that are composed of molecules called?

*March 12, 2008*

**Chemistry**

The nuclide 12 N 7 is unstable. What type of radioactive decay would be expected??? my guess is either gamma or beta. are either of those correct?

*March 4, 2008*

**Nuc. Chem**

Oh okay so for this one would it be: 40 Ar 18???? thanks so much for your help!

*March 4, 2008*

**Nuc. Chem**

HELP!!! I have like 20 of these kinds of questions on my homework and no clue how to solve them. Electron capture transforms 40 K 19 into what nuclide?!?! Thank you

*March 4, 2008*

**Trig word problem**

A park ranger at point A sights a redwood tree at point B at an angle 23 degrees from a fire tower at point C, From the fire tower, the Angle between the ranger and the tree is 123 degrees. If the ranger at point A is 2.3 miles from the fire tower at point C, how far is it ...

*February 24, 2008*

**trigonometry**

In triangle ABC, a=8, b=15, and m<C=40 degrees. Find the area of the triangle to one decimal place.

*February 24, 2008*

**trig WORD PROBLEM**

A park ranger at point A sights a redwood tree at point B at an angle 23 degrees from a fire tower at point C, From the fire tower, the Angle between the ranger and the tree is 123 degrees. If the ranger at point A is 2.3 miles from the fire tower at point C, how far is it ...

*February 24, 2008*

**trig**

In triangle ABC, find <A to the nearest tength of a degree is m<B=95 degrees , b=15.4, a=8.0

*February 24, 2008*

**trig**

Two ships, one sailing at 30 km/hr and the other at 45 km/hr, left port at the same time. Three hours later they were 120 km apart. If you had to find the angle between their courses an equation that could be used to solve this problem is:

*February 24, 2008*

**pre algebra**

2x+3y=6 2x=6-3y [subtract 3y to solve for x] x=(6-3y)2 [divide by 2 to get x by itself] 2x+3y=6 3y=6-2x [subtract2x to solve for y] y=(6-2x)/3 [divide by 3 to get y by itself]

*February 24, 2008*

**CHEMISTRY**

could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)-----> 3 C (g) a. find the rate of ...

*February 21, 2008*

**science**

nucleotide monomers a nucleotide is composed of: A Nitrogenous Base (purine or pyrimidine) A Five-Carbon Sugar A Phosphate Group

*February 20, 2008*

**Chem Urgent!**

the atomic mass in the periodic table represents the number of grams per one mol of lead. so there are 207.1 g per mol of lead.

*February 20, 2008*

**French**

oui, partager [the infinitive of partage] means share.

*February 20, 2008*

**AP CHEM-URGENT PLEASE**

could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)-----> 3 C (g) a. find the rate of ...

*February 20, 2008*

**Chemistry**

HELP! we just started kinetics and i have no clue how to solve this problem. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g...

*February 20, 2008*

**Chemistry**

thanks!

*February 14, 2008*

**Chemistry**

why does the value of i (van t' hoff factor) change with regards to theoretical vs. experimental? i'm not quite sure what happens but i know it has to do with ions in the solution. could it be attractive forces between ions?

*February 14, 2008*

**CHEMISTRY**

thank you so much! the molar mass was a major problem...i didn't realize i was so off. thank you for pointing that out.

*February 14, 2008*

**CHEMISTRY**

For a lab, I have to find the experimental values of i (Van T'Hoff factor). so far this is what i have, but it's incorrect. could you please tell me what i'm doing wrong??? thanks. given info: the lab varied the concentration of Mg(NO3)2 the theoretical value of i ...

*February 14, 2008*

**Chem=continued**

thank you. i'm confused thought....i tried to use a formula that already had molality in it because i don't have a mass to use, hence the g/GMW kg portion. i need to use 175 mL and make it boil at 245 degrees F.

*February 11, 2008*

**Chem=continued**

I'm currently working on a lab in which I have to make the solution boil at 245 degrees F. The solution will be a mix of ethylene glycol and I have to caluculate the volumes of water and solute needed to make the solution. here's my work so far. X= mL C2H4(OH)2 175mL-X...

*February 11, 2008*

**AP CHEM**

I'm currently working on a lab in which I have to make the solution boil at 245 degrees F. The solution will be a mix of ethylene glycol and I have to caluculate the volumes of water and solute needed to make the solution. here's my work so far. X= mL C2H4(OH)2 175mL-X...

*February 10, 2008*

**math**

Tom is now 25 years older then his son. In 10 years, Tom will me 5 years younger than 3 times his sons age. how old is tome now?

*December 15, 2007*

**math**

there are 50 question in a test. a student gains 2 marks for a correct anwser and loses 1 mark otherwise. if a student has 76 marks, how many question did he answer incorrectly?

*December 15, 2007*

**math**

an apple cost 20 cent and a orange cost 25cent. if the total number of apples and oranges is 20 and the total cost is 4.55, how many oranges are there?

*December 15, 2007*

**math**

omg ty u are a super pro

*December 15, 2007*

**math**

There are 9 more quarter then dimes.if the total value of the coins is 6.8, how ,any quarters are there?

*December 15, 2007*

**math**

how do you solve for 2/3 * ? = 20

*October 24, 2007*

**science**

what is a set of actions that a living thing is born with and does not need to learn called

*October 17, 2007*

**Physics**

dont no

*September 13, 2007*

**Algebra II**

Solve x^2>_2x+24 x^2-2x-24>=0 (x-6)(x+4)>=0 So as long as x>6, it works. But what about two negatives? Try x=-5..checks...check me on that. So it looks as if -inf<x<=-4 works, and 6<=x<inf works. check that.

*August 8, 2007*

**Algebra II**

Write y=x^2+4x-1 in vertex form. y=x^2+4x-1 y=(x^2+4x+8)-1-8 y=(x+2)^2-9 This isnt one of my answer choices,what am I doing wrong? in second line: y=(x^2+4x +4 )-1 +4 (take one half of the middle coefficient, then square it) y=(x^2+4x + 4 )-1 - 4

*August 8, 2007*

**Algebra II**

Solve x^2+2x=-2 by graphing and indicate the roots.Please and thank you We can't draw graphs for you here. The roots are x = -2.73 and -0.73 I suggest you make your own graph of y = x^2 + 2x and see where it crosses the horizontal line y = -2. Choose x values of -4, -3, -2...

*August 8, 2007*

**algebra II**

Help me solve this problem that I missed, so that I can see where I went wrong. Synthetic Division (3X3 -2x +5). (x-2) I would set it up with the following algorithm to do synthetic division (this is how I do it and how I taught it, the ----- are simply there to keep the ...

*August 7, 2007*

**Documenting a website for research paper**

I cant find it in my text book, can someone tell me how you document a website for the bibliography. also in parenthetical foot note things in the paper do you just use the author of the website? oh also, if the site doesnt tell the author??? (Broken Link Removed) Hold your ...

*July 2, 2007*

**Alexander the great fact**

I have a research paper due shortly and well when i was taking notes i didn't label a few of them(stupid i know) so now, I returned the books to the library, and i wrote the paper, and one fact which I think is good is that the seers he brought with him said the gods were ...

*July 2, 2007*

**math**

8 workers together at the same rate finished a painting job in 5 hours. hour long would it take 12 such workers working at the same rate to finish the same job? each worker finished____(fraction) of the job in one hour. 12 workers finished_____(fraction) of the job in one hour...

*April 13, 2007*

**Physics**

The 2-cm (radius) current loop shown in the figure is changing from Î¸1 = 11 degrees to Î¸2 = 66 degrees in a magnetic field 2 T in 0.5 seconds. What is the magnitude of the induced emf to the nearest hundredth of a millivolt? The wire in Problem 2 has ...

*March 27, 2007*

**Research Paper**

can someone tell me what the MLA style is? my textbook is requiring it for my paper but is not explaining it? Here are some MLA websites; the first one is the most thorough and the best: (Broken Link Removed) http://owl.english.purdue.edu/owl/resource/557/01/ Please repost if ...

*March 9, 2007*

**Japan**

social studies) Question:How many distance is Japan from the US? It is 6760 from New York Ciy to Tokyo It is 4791 miles from Seattle to Tokyo It is 3862 miles from Honolulu to Tokyo It is 2444 miles from Anchorage to Sapporo Take your pick The last entry (2444 miles) is ...

*January 22, 2007*

**word riddle help please**

what material is something that a person doesn't have?

*December 11, 2006*

**lively**

Suppose that four times the square of a number equals 20 times that number. Whatis the number? It'll take you 45 seconds if you just plug in a few numbers Again -- putting the subject in the subject line helps. =) 4 n^2 = 20n zero is one solution. Solve for n.

*November 26, 2006*

**lively**

Suppose that the width of a certain rectangle is three-fourths of its length, and the area of that same rectangle is 108 square meters. Find the length and the width of the rectangle If you put the correct subject in the subject line, you're likely to get a faster response...

*November 26, 2006*

**Economic**

marketing

*November 26, 2006*