Saturday

February 13, 2016
Total # Posts: 1,235

**Physics**

A powerful particle accelerator, called Large Hadron Collider, will be able to accelerate protons to 14TeV(tetraelectravolt)(1TeV= 10^12eV) of energy. a)what is the relativistic mass of a proton that has a total energy of 14TeV? (express you answer in MeV/c^2) to convert 14Tev...
*April 23, 2008*

**Physics**

If the distance between two slits is .05mm and the distance to the screen is 2.5m find the spacing between the first and second order bright fringees for yellow light of wavelenght 600nm. d=5x10^-5m L=2.5m wavelength= 6x10^-7m x=? x=wavelength*L/d =(6x10^-7)(2.5)/5x10^-5m =....
*April 23, 2008*

**History**

What country did cuba win its independence from at the start of the 20th century ?
*April 19, 2008*

**short story, part 1**

examination number 00778700
*April 18, 2008*

**writing**

I'm having trouble with a specific problems to write about. I was thinking about writing about the Opium Bride problem due to the cultivation of opium poppies. From the article, the problem seems to be eradication leads to a rise in Taliban support.
*April 13, 2008*

**writing**

Hi I'm writing a research proposal and I'm not sure if my thesis is specific enough or needs improvement. Thesis: Currently in Afghanistan, the lack of an effective method of regulation of the production of the opium poppy continues to obstruct Afghanistan's ...
*April 13, 2008*

**chemistry**

The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.510. If a trial's absorbance is measured to be 0.250 and its initial concentration of SCN– was 0.00050 M, the equilibrium ...
*April 9, 2008*

**chemistry**

An equilibrium constant A. is small when the products are favored in the reaction. B. is the same, regardless of the initial concentrations of reactants. C. is calculated by dividing the concentration of the reactants by the concentration of the products. D. is independent of ...
*April 9, 2008*

**Social Studies**

thanks
*March 31, 2008*

**Social Studies**

How did various inventions impact the economic development of differing areas of the country (North, South, and West)? Please help :)
*March 31, 2008*

**chemistry**

why does a weather balloon get bigger as as it rises from Earth's surface? I dont understand how this relates to "kinetic molecular theory"
*March 29, 2008*

**chemistry**

1) If the kelvin temperature of a gas sample in a steel tank increases to three times its original value , what will happen to the pressure? I think It will increase. Is this correct? By what factor does the gas pressure change? 2) A gas sample at a constant pressure shrinks ...
*March 29, 2008*

**Science 4th grade**

wata hek is apening here baby girl buger
*March 25, 2008*

**math**

While on vacation, Kevin went for a swim in a nearby lake. Swimming against the current, it took him 8 minutes to swim 200 meters. Swimming back to shore with the current took half as long. Find Kevin's average swimming speed and the speed of the lake's cuurent.
*March 17, 2008*

**Math**

how many significant figures are in: 6.626 times 10 to the 23?
*March 12, 2008*

**physics**

does a ball moving at a constant speed around a circular track produce acceleration?
*March 9, 2008*

**Physics**

a. Vt= w*r = (1.2*10^-15)*(2.2*10^20) = 264000 m/s b. w= period/time 1.2*10^-15= 2pi/t t= 5.2*10^15 seconds t= 1.7*10^8 yrs
*March 6, 2008*

**simplifying radicals**

helo! i know how to simplify radicals but.. I dont get this one. behind of the radical (square root sign) there is a big gap before the number. Many people are saying it's a typo, but.. i dont know. there are a couple like that. example problem: square root of "space&...
*February 25, 2008*

**Science**

.. its a hypothesis. how can someone help you when its your opinion? no offence but, if you're asking how to write a hypothesis, just google "how to write a hypothesis". the only thing these people will give you is a link to some site you can find by googling.
*February 25, 2008*

**Physics => speed of sound variation**

I'm sorry. I know this question was asked a while ago, but I'm having trouble figuring out how you did your integration of dt T = integral of dt = integral of dh/v from h1 to h2 (from 0 to 9000m) did you use substitution dh = t dv? Thanks!
*February 20, 2008*

**math**

in B+4 = (3/4) (C+4) = (3/4) C + 3 B-4 = (1/2) (C-4) = (1/2) C - 2 may I ask where you got the +3 and -2?
*February 15, 2008*

**math**

In four years Cathy¡¯s cat Byte will be three fourths as old as Cathy will be. Four years ago, Byte was only half as old as Cathy was. How old are Cathy and her cat? I am struggling to solve this two variable word problem. please help.
*February 15, 2008*

**Chemistry**

Oh okay. Could Cl2 be (aq) though? Like dissolved in water as a molecule?
*February 13, 2008*

**Chemistry**

I figured the equation, but I just wasn't really sure about the states. From what I know Cl2 and Br2 could be (aq) or (g) and the 2Br- and 2Cl- should be both (aq). But I'm not really sure.
*February 13, 2008*

**Chemistry**

Whats the balanced net ionic equation for Chlorine reduced by Bromine?
*February 13, 2008*

**algebra**

hi! im having some problems with my word problem. Ann regularly swam .4 km in 20 min at the school pool. Swimming in a river against the current, she swan .25 km in the same time it took Ann to swim .75 km with the current. Dind the speed of the current and the time it took ...
*February 13, 2008*

**chemistry**

i did what u wrote above. but did not have the answer right. The answer from the book is 13.9 kJ
*January 24, 2008*

**chemistry**

How much heat would be released by the condensation of 5.40 g of steam at 100 °C and the subsequent cooling of the water to 25 °C? [ÄHvap = 40.7 kJ/mol at 100 °C; Cp for H2O(l) is 4.18 J g-1 °C-1]
*January 24, 2008*

**math**

w = width l = length p = perimeter p = 2w + 2(2w + 2) 34 = 2w + 4w + 4 - distributive property 34 = 6w + 4 30 = 6w - move the 4 to the other side 30/6 = 6w/6 5 = w to check that w + w + (2w + 2) + (2w + 2) 5 + 5 + (2(5)+ 2) + (2(5)+ 2) 10 + 12 + 12 =34
*January 22, 2008*

**alegebra**

which two equations represent perpendicular lines: y= 2x-9 y= 1/2x+9 y= -1/2x+9 y= 1/2-9
*January 21, 2008*

**algebra**

write an equation for (-5) and y-intercept (0,5)
*January 21, 2008*

**Math**

HURRY PLEASE
*January 14, 2008*

**Math**

what are irrational numbers?
*January 14, 2008*

**algebra 2..again**

Try it this way... 2y^3 - 10y^2 + 12y Switch A&C to make it easier (always acceptable, just remember to keep your signs): 12y - 10y^2 + 2y^3 Factor out a GCF, in this case it's 2y: 2y(6 - 5y + y^2) Next, factor a trinomial: 2y(2 - 1y)(3 - 1y) This trinomial is your final ...
*January 9, 2008*

**math**

I am having trouble finding the next two numbers in this series: 1, 1/4, 1/9, 1/16, ...
*January 8, 2008*

**Pigskin Geography**

What is the most arid and wettest cities in the U.S. (Football)?
*January 6, 2008*

**Reading**

In korea, I used to attend speed reading classes. I'll tell you 1 teeny secret. you read in 1 big Z per page. its really hard at first, and there are more "secrets" :D but thats mostly what it is. I'm not the best, as there are people who read far faster then...
*December 8, 2007*

**math**

... make the equation clearer. is it d = c-s/n ; d/n = c-s ; or d/n = c-s/n ?
*December 8, 2007*

**Sets**

My teacher assigned homework today that says to "specify the intersection and the union of the given sets." 1 problem is : {10,-6,-2} and {-2,2,6} i believe what she is requesting is 2 venn diagrams. one for intersection and one for the union. I've made the ...
*December 7, 2007*

**Algebra - 2 more questions... ^^**

Thank you for helping on the other problem, but could you maybe explain how I should solve these two problems? 1. In 1985, Barry was 13 years old and his father was 43. In what year will Barry's age be two-fifths of his father's age? 2. The length of a certain ...
*November 28, 2007*

**Algebra**

Hi I was wondering if I could get some help on this word problem... Penny collected some change in preparation for a garage sale. She collected two more nickels that twice the number of dimes and eight fewer quarters that twice the number of nickels. If the value of the ...
*November 28, 2007*

**american history**

I was wondering if anyone here knew a site with a copy of the constitution. I googled it but... i cant seem to find it.
*November 27, 2007*

**chemistry**

when 18.66 g of magnesium react with 22.28g of oxygen, 30.94g of megnesium oxdie forms. If all the magnesium reacts, how many grams of oxygen remain un-reacted?
*November 20, 2007*

**ENVIRONMENTAL SCIENCE**

DESCRIBE THREE COMMON CHALLENGES WITH MANAGING NONRENEWABLE ENERGY RESOURCES
*November 20, 2007*

**math-algebra-angles**

The degree measures of two angles of a triangle are consecutive even integers. If the measure of the third angle is 50 degrees more than twice the measure of the least angle. Find the measure of each angle.
*November 16, 2007*

**Physics**

:P please help on #3.. i dont get it... I tried drawing something and then made an equation.. but... :(
*November 15, 2007*

**Physics**

I found something for u in return for your help^^ go to : h t t p : / / w w w . p h y . d u k e . e d u / ~ r g b / C l a s s / p h y 5 3 / p h y 5 3 . h t m l *** (without the spaces) do control F (find) and type in : This is a block whirled on the end of a string it will go ...
*November 15, 2007*

**algebra.**

ohh.. ^^ thank you :D now... any1 up for the next 2? ^^
*November 15, 2007*

**algebra.**

problems about angles: Hi. I needed help on some problems for the math section that we are doing in class. I am trying out some problems in my math book, but they prove quite difficult. 1. In a certain parallelogram, if the measure of one angle is 30 degrees more than the ...
*November 15, 2007*

**Economic**

The establishemnt of regional trading blocs may lead to a decline in global trade follwoing these reason. Explain why. 1. Sufficent trade diversion occurs 2. Government increase tariffs to nonmember nations to offset lost tariff revenus from coutntries participating in ...
*November 14, 2007*

**Statistics - Probability**

Viruses reach networks by requests for communication that are identified as packets. A security system can detect them if at least one such packet is observed by a network sensor. Assume that the probability of observing a single packet sent from a new virus is .001. The virus...
*November 7, 2007*

**science**

Explain the main factors that affect the Earth’s temperature.
*October 29, 2007*

**Global warming**

Explain the effect of clouds on global cooling Describe the relationship between carbon dioxide levels and deforestation. Explain how rising global temperatures are connected to rising sea level.
*October 29, 2007*

**Global warming**

1) Explain the effect of clouds on global cooling. 2) Describe the relationship between carbon dioxide levels and deforestation. 3) Explain how rising global temperatures are connected to rising sea level.
*October 29, 2007*

**english**

thanks
*October 25, 2007*

**english**

My teacher told me that this sentence is ambigious. Can someone help me to fix this. "One of the main impacts is the transmission of many infectious diseases carried by insects, such as malaria and dengue which are sensitive to temperature, humidity, and changes in forest...
*October 25, 2007*

**Health**

What is the defination for Saturated Fats, and Unsaturated Fats?
*October 24, 2007*

**okayyy... help please?!?**

my question is still not answered, so I was making sure you actually saw it... its down there.. its topic is math, name : Jason
*October 3, 2007*

**someone please help....**

help!
*October 3, 2007*

**math**

help please?!
*October 3, 2007*

**math**

How do you figure out the slope without drawing the graph? I kinda forgot. I have a chart with data, and I need to know the slope please help thank you
*October 3, 2007*

**project...**

OH MY LORD..... thank you so so so so so so so so so so VERY MUCHO. THANK YOU ^^
*September 22, 2007*

**project...**

Hi I was working on an essay for my project, and I forgot what the word was for cancer that is not deadly... it was _______ cancer, but I just forgot. Ever experience when you are working talking, the words on the tip of your tongue, but you don't know it?.... ugggggg so ...
*September 22, 2007*

**algebra**

Hi! i dont get this problem... I was wondering if you could help. The problem is: x-y=9 3x+(y+4)=51 What is S and what is L?
*September 21, 2007*

**science**

Is the gulf stream an open or closed system?
*September 13, 2007*

**I think you didnt see my question ^^ help please!**

ohhhh... its those words.. thank you!!!!
*September 13, 2007*

**I think you didnt see my question ^^ help please!**

Hi!!! I didnt understand these problem, so I was wondering if you could explain how to do them for me. I was going to ask the teacher but she had already left the campus. Thank You!! Questions: When an increase in the value of one variable quantity corresponds to a decrease in...
*September 13, 2007*

**Algebra**

please?
*September 13, 2007*

**Algebra**

Hi!!! I didnt understand these problem, so I was wondering if you could explain how to do them for me. I was going to ask the teacher but she had already left the campus. Thank You!! Questions: When an increase in the value of one variable quantity corresponds to a decrease in...
*September 13, 2007*

**Social Studies**

How have cultures changed in relation to the environment?
*September 12, 2007*

**english**

is true a noun? if so is it an abstract noun?
*September 10, 2007*

**Law**

can anyone tell me what "host liability" mean? I already looked in the dictionary but it's not there
*September 9, 2007*

**debate**

1. What are the advantages of our current tax system? What are the disadvantages? 2. What groups are hurt most by a “flat tax?” What groups profit the most? 3. Explain what tax deductions, tax credits, and tax shelters are (look them up if necessary). Why has the ...
*August 24, 2007*

**math**

i doing for this too is was very hard
*August 23, 2007*

**Algebra :P... again**

Hi! Sorry.. but 1 more question? Direction: Find the domain of the function. Problem: y = - 1 0 / 1 1 - x [A] All real numbers except x= -11 [B] All real numbers except x= 0 [C] All real numbers except x= 10 [D] All real numbers except x= 11 Also.... if the person answering ...
*August 20, 2007*

**Algebra**

Hi! My name is Jason... today I have 2 problems for you both having to deal with Algebra. My questions are ::: Question 1 :: Direction: Find the degree of the polynomial. Problem: - 1 + 8 x ^ 4 - x ^ 2 (negative 1 plus 8x squared minus x squared) Question 2 :: Classify 1 6 + 5...
*August 20, 2007*

**Science**

What is the purpose on DNA This is a very interesting article on the purposes of DNA. (Broken Link Removed)
*July 27, 2007*

**C++**

class professor {}; class teacher : public virtual professor {}; class researcher : public virtual professor {}; class myprofessor : public teacher, public researcher {}; Referring to the sample code above, if an object of class "myprofessor" were created, how many ...
*July 25, 2007*

**math**

solve the equation x^3-5x^2-4x+20=0 I need a hint on how to solve this Look for the first root by graphical means or trial-and-error. Note that when x=2, x^3-5x^2-4x+20 = 8-20 -8 +20 = 0. Therefore 2 is one root and x-2 is a factor. Next, divide x-2 into x^3-5x^2-4x+20 using ...
*July 8, 2007*

**Math**

1 whole
*July 6, 2007*

**Physics**

How would you use a pulley system with one rope to pull at a single item at two points simultaneously? The free ropes of two block and tackle pulley systems could be joined to pull an object in two places. Or you could just hang a rope over two pulleys on a ceiling, tie both ...
*June 13, 2007*

**physics**

how does a vcr work through electromagnetism? please give me some links. http://www.howstuffworks.com/vcr.htm http://en.wikipedia.org/wiki/VCR
*June 4, 2007*

**Algebra**

If some one can get me started, I should be able to graph this. MONTGOMERY COUNTY COMMUNITY COLLEGE MAT106 SUMMER, 2007 ASSIGNMENT #1 NAME______________________________ The Wellbuilt Company produces two types of wood chippers, Deluxe and Economy. The Deluxe model requires 3 ...
*May 30, 2007*

**l.a.**

what scenes from othello would any of you recomend for my school movioe? I think that Act 3, Scene 3 would be a fun one to do. http://www.sparknotes.com/shakespeare/othello/section5.rhtml
*May 26, 2007*

**mathyematics**

a diagram of the net of each of the following solid cube, cuboid, cylinder,cone, prism, pyramid and sphere. See response to your second post.
*May 25, 2007*

**mathematics**

types of prism and pyramid. See response to your second post.
*May 25, 2007*

**mathematics**

draw a table illustrating the number of edges, face, vertics each of the following solid have cube, cuboid, cylinder, cone, prism, pyramid, sphere. I searched Google under the key words "geometric solids" to get these possible sources: http://illuminations.nctm.org/...
*May 25, 2007*

**mathematics**

cube, cuboid, cone, prism, pyramid, sphere. (Differentiate between the regular and irregular) See following response to your post. Thanks for asking.
*May 25, 2007*

**social studies**

What is a person called who is appointed to take care of a community's daily business? a city manager?? Mayors are usually elected, but city managers are usually appointed by the mayor and/or city council. =) my guess would be a mayor, but it's just a guess.
*May 23, 2007*

**Chemistry II**

Forgot to account for an additional -286 kj when calculating the heat of combustion for H2 (you have two moles of H2 in the combustion equation, not just one). The final answer should be -158 kJ/mol.
*May 20, 2007*

**Chem**

K so this time it is basic concept and I am suppose to guess what happens, so I've written the cause but I have also written my answer to the reaction and effect. so for: A + B <=> C stress: A is increased reaction: forward effect:[A]increased [B] inc [C]inc Stress: ...
*May 16, 2007*

**~CHEM~**

If I had an equilibrium of CH3CO2(aq) + H(aq) <=> CH3CO2H(aq) and the applied stress was HCl and NaOH what observations should I expect and what direction would the equliibrium shift? Same goes to this question equilibrium:Fe(aq) + SCN(aq) <=> FeSCN(aq) the ...
*May 16, 2007*

**CHEMISTRY**

Wondering If I did this correctly so far 50.0 ml of a 0.0500 M solution of lead (II) nitrate is mixed with 40.0 ml of a 0.200 M solution of sodium iodate at 25°C. Calculate the Pb2+ and IO3- concentrations when the mixture comes to equilibrium. At this temperature the Ksp ...
*May 14, 2007*

**Algebra**

interactmath do.t c.o.m. i m in calc.2 and still use it
*May 13, 2007*

**chemistry-**

How do I construct an ICE table for this question. CH3COOH + NaOH --> CH3COONa + H2O Fill in the equilibrium line of the table. [Think about the initial pH and think about the pH at the end point of the titration. Initial pH 2.72 When the solution turned pink pH was 8.49 I ...
*May 9, 2007*

**~Chem**

I was looing over this question and the answer I got was not correct, I noticed that somone already posted this question up before but maybe if I provide the answer I could get an understanding of the steps. @462degrees the reaction heat + 2NOCl <=> 2NO + Cl2 has an ...
*May 8, 2007*

**Public Policy**

Drawing on the courses in the public policy stream of the curriculum, answer the following question. Assume you have been asked to set up a policy analysis unit in the state of Ohio. The unit will report directly to the Governor and will be responsible for the analysis of the ...
*May 8, 2007*

**CHEMISTRY**

What happens to the equlibrium constant if the pressure increased? the Kc of 2NH3<=>N2+3H2 is 0.03 N2 is (0.1M) H2 is (0.3M) NH2 is (1M) The equilibrium constant is just that, a constant, and is not subject to change with pressure changes. It will change with temperature...
*May 3, 2007*

**GeoChemistry**

A sample of charcoal in 1995 has a 14C activity of 7.35dpm g^-1. What are tje age of the charcoal, the corrected age (years BP) and the age corrected for variations in solar activity (if possible)?
*May 3, 2007*

**Chemistry**

Thallium (I) iodate is only slightly soluble in water. Its Ksp at 25°C is 3.07 x 10-6. Estimate the solubility of thallium iodate in units of grams per 100.0 ml of water. TlIO3(s) <==> Tl^+ + IO3^- Let x = molar solubility of TlIO3. The x is molar solubility of Tl^+ ...
*May 2, 2007*