Sunday

May 24, 2015

May 24, 2015

Total # Posts: 694

**Chemistry**

An ion exchange process may be used to remove ions causing hardness of water. Outline how this works. 1. Ca2+ and Mg2+ are the ions that cause the hardness of water, one example of softening the water is to react the hard water with NaCO3 (Sodium bicarbonate) to soften the ...
*May 30, 2009*

**math**

how would you solve: sin(2x)+cos(2x)=tan(x)?
*May 28, 2009*

**physics loop**

The small mass m sliding without friction along the looped track is to remain on the track at all times, even at the very top of the loop of radius r. (not unlike a roller coaster) A)In terms of the given quantities, determine the minimum release height h. (i got this to be 2....
*May 22, 2009*

**physics**

thanks! i used the two equations for w0 and set them equal to each other and solved for m and it worked! thanks!
*May 22, 2009*

**physics imperfect spring**

The force required to compress an imperfect horizontal spring an amount x is given by F= 150x+12x^3, where x is in meters and F in newtons. If the spring is compressed 2.1 m, what speed will it give to a 4.0 kg ball held against it and then released?
*May 21, 2009*

**physics spring**

the equation to use is more specifically x(t)=A(e^t*L)cos(w't) does that change it? because i'm still not getting the right answer
*May 21, 2009*

**physics spring**

but how do you find A (i'm assuming amplitude)?
*May 21, 2009*

**physics spring**

A glider on an air track is connected by springs to either end of the track. Both springs have the same spring constant,k , and the glider has mass M. A)Determine the frequency of the oscillation, assuming no damping, if k= 125N/m and M= 250g. (I got the answer to be 5.03 hz) ...
*May 21, 2009*

**math**

first, get them a common denominator (in this case 35). so (-8/7)5/5+(4/5)7/7= (-40/35)+(28/35) = (-40+28)/35 = -12/35 or so i believe
*May 21, 2009*

**Math**

take factors, beginning with the least common factors. ex: 90=3,3,10 two 3s (three squared) mean you take a three out, multiplying it by the square root of ten left.
*May 21, 2009*

**math**

would this be a correct proof of the cauchy-schwartz inequality: abs=absolute value abs(u*v) is less than or equal to abs(u)*abs(v). Then you divide both sides by abs(u)*abs(v) so that you get cos(theta) is less than or equal to 1.
*May 14, 2009*

**Prealgebra**

92% of 30 is what number
*May 14, 2009*

**calculus**

I am having alot of trouble remembering how to do this and this is a practice question for my final if you could help that would be great. Solve the differential equation (dy/dx)=(3x)/(1-x^2)
*May 10, 2009*

**English 10 Cp**

a question asked solely to produce an effect or to make an assertion and not to elicit a reply.
*May 4, 2009*

**Chemistry**

The addition of aqueous ammonia to the cathode compartment of the cell described below reduces the cell potential. Likewise, the addition of aqueous ammonia to the anode compartment increases the cell potential. Zn(s)/Zn^2+(aq)//Cu^2+/Cu(s) Assume that [Cu^2+(aq)]0=[Zn^2+(aq)]...
*May 4, 2009*

**Chemistry**

I understand this but i am confused becuase the problem uses a weak acid and strong base and the mLacid x Macid = mLbase x Mbase is for the equilibrium part put i am supposed to find the volume of titrant needed to reach the endpoint i think i am missing a concept. Please help
*April 10, 2009*

**Chemistry**

How do you calculate the volume of titrant needed to reach the endpoint of a reaction when you are given the mls and molarity of a strong base and only the molarity of a weak acid?
*April 10, 2009*

**Latin**

To translate the sentence, "I will not be the first to fight" is it "Non ero prima pugnare" or is it "non ero primum pugnare"... in other words, do I translate "I" as feminine because I am a girl, or do I translate it as neuter because ...
*April 7, 2009*

**English**

1) "I am filled with sadness." Can you explain the grammar rules for using "filled" instead of fill? 2)"We visited the Detainees (sic) camps and we saw the jails." What does '(sic)' mean? 3) Sometimes we see 'p.s.' at the end of a ...
*April 2, 2009*

**Health**

The body’s ongoing process of regulating its internal environment—electrolyte balance, blood chemistry, temperature, and so on—is called A. excretion. C. peristalsis. B. homeostasis. D. metabolism (B)
*March 25, 2009*

**Health**

An organelle is A. the smallest “living” structure in the body. B. a specialized body part composed of tissues. C. a structure in the cytoplasm. D. any complex living being, plant or animal. (c) is this correct
*March 25, 2009*

**body systems**

Thanks!
*March 25, 2009*

**body systems**

A 67-year-old man is diagnosed with cancer and subsequently undergoes chemotherapy. As an expected side effect of chemotherapy, his bone marrow stops functioning. What is a potential consequence of this loss of function? A. His calcium levels will decrease. B. He’ll ...
*March 25, 2009*

**Science**

When I bend down, what kind of force is involved? Is it the pulling force of the muscle?
*February 16, 2009*

**Organic Chemistry**

Jenn is correct. Rates of all reactions ( SN2, SN1, E1, and E2) increase if the leaving group has a better ability to part. The leaving group trend increases as you go down the periodic table of halogens.
*January 21, 2009*

**chemistry**

Thank you for the examples given. The teacher treats the gasoline explosion as low energy activation example because the gasoline only requires a spark to ignite. Do you agree it is a low energy activation example? By your example, I think that rusty nails is a high energy ...
*January 17, 2009*

**chemistry**

I need two real life examples of chemical reactions that require high activation energy. Please help.
*January 17, 2009*

**chemistry**

what does small electronegativity difference reveal about the strength of a covalent bond?
*January 11, 2009*

**algebra**

4-3x = x + 1
*December 17, 2008*

**help plzzz**

heyyy. im doing the same math sheet as well and is soooooo totally confused, lol
*December 3, 2008*

**math**

what is a boldface digit and how do you find its value
*October 30, 2008*

**science**

the density is the light wheight of an object . that winn help
*October 30, 2008*

**history**

draw one fighting the other anti and con.
*October 30, 2008*

**Algebra 1: 8th Grade**

are we human? ... or are we dancers?
*October 27, 2008*

**R.E**

the hundisim started in india
*October 19, 2008*

**math**

what do you call numbers suth as 2,4,6,8 or,10 in an array
*September 9, 2008*

**math**

what do you call munbers suth as 2,4,6,8, or 10 my homework is due today in 3 hours !
*September 9, 2008*

**human resources**

I'm writing an essay looking into why organisations may systematically not hire the best candidate for the job. So far I have only been able to think of positive discrimination as a positive reason. Does any one else have any ideas?
*August 6, 2008*

**Algebra II**

I'm pretty confused about these problems. We're learning growth and decay, but there are quite a few formulas. 1. Suppose $500 is invested at 6% annual interest compounded twice a year. When will the investment be worth $1000? 2. Suppose $500 is invested at 6% annual ...
*June 8, 2008*

**Social Studies**

The most useful indicator of degree of democracy reached by a particular society is whether it has a a) civilian government b) formal method whereby people can effect changes in government policy c) system of government checks and balances d) system of liberal and humane ...
*April 30, 2008*

**Health**

Essential nutrient? a) are made by the body b) only can be supplied adequately with dietary supplements c) must be obtained through diet d) consist of over 75 different types of nutrients
*April 30, 2008*

**Health**

Essential nutrient? a) are made by the body b) only can be supplied adequately with dietary supplements c) must be obtained through diet d) consist of over 75 different types of nutrients
*April 30, 2008*

**Health**

one example of a chemical in food that is not a nutrient is? a) fiber b) selenium c) starch d) folate
*April 30, 2008*

**Social Studies**

if you are refering to the United States of America there are 50 states total. if you are including usa and canada i'm not sure.
*April 30, 2008*

**Social studies**

The most useful indicator of degree of democracy reached by a particular society is whether it has a a) civilian government b) formal method whereby people can effect changes in government policy c) system of government checks and balances d) system of liberal and humane ...
*April 30, 2008*

**Science**

Table salt - sodium chloride, one of the most common substances occurring in nature- is best classified as which of the following? a) a compound b) a mixture c) a solution d) an alloy e) an amalgam
*April 30, 2008*

**Science**

An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the folloeing objects will accelerate EXCEPT a)a ball striking a wall, in which the force of the ball on the wall is equal ...
*April 30, 2008*

**Science**

Which of the following compounds in the liquid phase can be considered an electrolyte? a) CO 2 (carbon dioxide) b) CuO (oxidized copper) c) H2O ( distilled water) d) H2O2 ( Hydrogen peroxide) e) NaCI (sodium chloride)
*April 30, 2008*

**music history**

wat websites can i find choirs history
*April 29, 2008*

**Algebra**

Find the exact solutions of the systems of equation x^2+2y^2=18 and x=2y
*April 25, 2008*

**Literature**

In "A White Heron," how does Sarah Jewett portray Sylvia's attitude about money
*April 18, 2008*

**chemistry**

Why is; a) antimony pentafluroide Sb(-3) + F5(-1) --> SbF4 ? b) aluminium bromide hexahydrate Al(-1) + Br(-1) --> AlBr3 . 6H2O ? The charges don't add up for (b), is there something to do with the "ide"? I don't get it. And for (a) how did "...
*February 25, 2008*

**PHYSICS**

Suppose that a tank contains 680m^3 of neon at an absolute pressure of 1.01*10^5 Pa. The temperature is changed from 293.2 to 294.3 K. What is the increase in the internal energy of the neon? I don't have any idea to do it. Please help! Give me some ideas!THANKS A LOT!!!!
*February 21, 2008*

**math**

I need help with Fraction vocabulary worksheet
*February 19, 2008*

**algebra**

The sum of the first n counting numbers 1 + 2 + 3 + 4 + 5 ... + n is given by S = n/2(1 + n). a) Find the sum of the numbers 14 to 40 inclusive Answer is 729. But i don't get why. Someone explain what the qestion means by "inclusive" please ><!
*February 8, 2008*

**Math**

The fourth largest is the Arctic Ocean. If P over 12 (p/12) stands for the approximate area of the Arctic, then what is the approximate area of the Arctic?
*January 31, 2008*

**government**

copyright.
*January 11, 2008*

**Maths**

uhm, is that [2 x (22/7) x 112 x 10^6 km] / (200 days) x 24 h/day] ? Where did the 22/7 come from? i calculated it and it came out to be 8.448 x 10^(7). My textbook's answer says 1.47 x 10^(5) km/h. could you further explain the question? and what you do with the pi. ...
*January 10, 2008*

**Maths**

Assuming that the planet Venus moves in a circular orbit of radiua 112 million km around the Sun and that it completes one revolution in 200 days, calculate the speed of Venus. Express your answer in scientific notation in km/h and use ð = 3 1/7.
*January 10, 2008*

**Math**

They are both right, but the second answer (1 23/30) is the simplified form. So when giving an answer, give it in simplified form. You could lose marks if you don't.
*January 10, 2008*

**Math**

4/5 - 1/2 common denominator is the number where they can both divide into equally, for this one, it would be 10. (5 x 2 = 10) (2 x 5 = 10), once you find a common denominator (preferably the lowest common multiple) you must multiply the denominator (with the number to create ...
*January 10, 2008*

**Social Studies.**

Thanks, I posted my assignment yesterday.
*November 29, 2007*

**Social Studies.**

Describe the impact of Orientalism on Muslim and Arab Americans and list two to three characteristics of Orientalism. My answer. Increases in work-place discrimination is a form of orientalism. Identify issues that reach across racial, ethnic and other divisions and forge ...
*November 29, 2007*

**Grammar**

This question has been bothering me. Is twenty five proper or twenty-five?
*November 21, 2007*

**Algebra**

For x such that 0<x<ƒÎ/2, the expression ã(1-cos^2 x)/sinx + ã(1-sin^2 x)/cosx is equivalent to: 0, 1, 2, -tanx or sin2x Any help would be appreciated. Thanks.
*November 17, 2007*

**grammar**

I didn't write the sentence, it's just on a worksheet.
*October 21, 2007*

**grammar**

Is this the correct use of a semicolon? From the harbors of Africa to the forests of Vietnam, mankind has glorified the most horrid of acts; the practice of murder.
*October 21, 2007*

**International Finance**

what is the general formula for figuring out this question? If the dinar devalues against the US dollar by 45%, the US dollar will appreciate against the dinar by...? I'm not getting this at all, and the book is not helping!!
*October 18, 2007*

**social studies**

a formal method whereby people can effect changes in goverb. policy
*October 9, 2007*

**math**

Eight is the same as the quotient of 16 x.
*September 17, 2007*

**math**

write an equation thirteen decreased by n is equal to 9.
*September 17, 2007*

**Algebra**

well, I didn't think there was any parentheses, but if your teacher says there should be, then the only place that would make sense for them to go would be around the the 20 / n
*September 11, 2007*

**We don't do YOUR WORK**

understandable, and I have read through all these posts. and might I remind you that school has changed alot since you were there so you still have no idea.
*September 11, 2007*

**We don't do YOUR WORK**

your all wrong!! Sometimes us kids need help!!! we're under so much pressure, that none of you understand. We just thought it would be nice that for ONCE in our life that the answer was given to us. Sorry for thinking other people could be courteous and nice.
*September 11, 2007*

**Geography**

A railway was built from Burma to Thailand during WWII. What is the correct name for this railway? Is it the Siam-Burma Railway? Thanks
*September 8, 2007*

**Math**

what do we call the numbers that cannot be arranged into 2-row arrays?
*September 6, 2007*

**Math(Geometry)**

lol i was stuck too! im soo lucky i found this site tanz to all
*August 22, 2007*

**Math(Geometry)**

lol i got stuck on the same questions and googled them. this helped allot! tanx
*August 22, 2007*

**Algebra 1**

simplify 2/x^2-y^2-1/x^2-3xy+2y^2-3/x^2-xy-2y^2 group like terms, and combine them. I see terms 1/x^2, y^2, and xy terms that can be grouped. We will be happy to critique your work.
*July 2, 2007*

**physics**

A wrecking ball (weight 4140 N) is supported by a boom, which may be assumed to be uniform and has a weight of 2550 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32 degrees, and ...
*June 9, 2007*

**Tangents!**

Rohombus ABCD is circumcribed about P and has a perimeter of 32 Fing x. Hmmm. What is Fing x mean? Never mind the 'fing x', I am still trying to find P
*April 2, 2007*

**(Home) Economics**

Using supply and demand analysis, comment upon whether a free market in university education will always lead to higher charges for law at Cambridge than for sociology courses at new universities. Consider how many people will apply to law school (a graduate cirriculum) at one...
*March 4, 2007*

**Chemistry**

Can anyone help I have to write an equation a structural formula for a reaction between the following, having some trouble working it out. Hopefully you can understand the way I have put it. CH2=CH-CH-OH there is a CH3 with single bond under CH next to OH + CH3-CH-CH2-C to one...
*February 27, 2007*

**AP U.S. History McKinley's campaign manager**

what role did MARK HANNA McKinley's campaign manager play in the election and how would he had voted?
*February 26, 2007*

**U.S. History- McKinley's Campaign**

In Mckinley's Campain,two of this campaign themes were "The Currency Question"- the gold standard or free labor AND "Protective Tariffs" summarize these thems and which of theses themes was more significant? This site will give you the information on ...
*February 26, 2007*

**AP U.S. History Foreign Policy**

What were the essential principles of the Theodore Roosevelt's foreign policy, and how did he apply them to specific situations? he believed in the more developed nations helping those that were more underdeveloped. He used the army to help countries like Cuba and Puerto ...
*February 22, 2007*

**AP U.S. History 1920's immigration**

Between 1880 and 1925 American society remained true to its core values of liberty, equality and opertunity regaurding immigration issues. Asses the validity of this statement. Ha! whatever! Tons of immigration took place between those years, and the increase in population ...
*February 21, 2007*

**Science**

if you could place a red blood cell in distilled water,what would you see happen to the cell? explain.
*October 22, 2006*

**proof read bio lab**

Hi, it would be greatly appreciated if someone could proofread parts of my bio lab. Introduction VO2 max or maximum oxygen consumption is a value which measures a body’s ability to make the energy required for physical activity. VO2 max measures the maximum volume of ...
*October 12, 2006*

**calculus**

Factor theorem states that "x-a is a factor of f(x) if and only if f(a)=0" 1. What is the sufficient condition of the factor theorem? 2. What is the necessary condition of the factor theorem? My answer was x-a is a factor of f(x) for (1.) and f(a)=0 for (2.) but it ...
*September 28, 2006*

**chemistry - pick a polymer**

I need to pick a polymer for my science project. It has to be organic and preferably simple. Some that are already taken are: polyethene, polystyrene, PVC, polyacrylonitrile, DDT , nylon.. Thanks a lot it has been really hard for me to find something. I don't know if you ...
*September 26, 2006*

**Biology**

This is related to a biology lab I did. What is the purpose of adding sand to hydrogen peroxide (and put at a glowing splint at the mouth of the tube)? The purpose of this lab was to study the action of the enzyme catalase (potato)on hydrogen peroxide and to determine the ...
*September 24, 2006*

**MATH!!!**

given isosceles triangle ABC, line AB = BC, and BD is the angle bisector of isosceles triangle ABC prove AB x DC = BC x AD Aren't the two halves congruent? (SAS) If so, then DC is equal to AD. Don't the ratios AB:AD=BC:DC by corresponding parts? how do i write that out...
*September 6, 2006*

**got a couple of calculus questions**

1. What is the equation of the tangent line to y = 2*x(x - 4)^6 at point (5, 10)? 2. If f(x)=8/(x^2+4) , find the slope of the curve at the point (2, 1). 3. The demand function for an item is given by x=200[1-(p/(p+2))] . At what rate is the demand changing when the price p is...
*July 9, 2006*