Monday

November 30, 2015
Total # Posts: 370

**chemistry**

in regard to the reverse freezing process of water(when it expands) and others molecules contract.. is it only water that does this or is it all the hydrogen bonded molecules?? ( N,O,F) NH3, H20 anf FH...my science teacher doesn't know the answer and i'd really like to...
*October 13, 2009*

**math**

S=5d/7
*October 9, 2009*

**PHYSICS**

A potential energy function for a two-dimensional force is of the form U = 2.46x3 y - 5.05x (which has units of J). Calculate the force that acts at the point (1.26 m,1.18 m).
*September 29, 2009*

**PHYSICS**

If it takes 4.12 J of work to stretch a Hooke's law spring 12.1 cm from its unstressed length, determine the extra work required to stretch it an additional 10.0 cm.
*September 29, 2009*

**PHYSICS**

Estimate the terminal speed of a wooden sphere (density 0.700 g/cm3) falling through air if its radius is 3.20 cm and its drag coefficient is 0.470.
*September 24, 2009*

**PHYSICS**

A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 23.0 degrees with the horizontal. A piece of luggage having mass 31.0 kg is placed...
*September 21, 2009*

**physics**

thanks for your help drwls.
*September 13, 2009*

**Physics**

thanks a lot. that really helped.
*September 13, 2009*

**Physics**

A fire helicopter carries a 615 kg bucket of water at the end of a cable 19.5 m long. As the aircraft flies back from a fire at a constant speed of 40.5 m/s, the cable makes an angle of 35.2o with respect to the vertical. Calculate the force of air resistance on the bucket
*September 13, 2009*

**Physics**

thanks a lot. that really helped.
*September 13, 2009*

**Physics**

Three forces acting on an object are given by F1 = (-8.79i + 8.34j) N, F2 = (7.06i + -3.02j) N, and F3 = (-3.05i) N. The object experiences an acceleration of magnitude 2.26 m/s2. What are the components of the acceleration vector?
*September 13, 2009*

**algebra**

I know its true but why? When you multiply a whole number by a whole number the result is a larger number. When you multiply fractions the result is a smaller number.
*September 1, 2009*

**Pre Algebra**

Solving part of a part. How do you use thermometers to solve fraction problems?
*September 1, 2009*

**10th grade Physics**

What experiment(apparatus can be made) can be used to determine the relationship between period and frequency of vibration?
*August 4, 2009*

**Spanish QUestions LOOK DOwn please!!!**

PLease look down. Thank you.
*May 14, 2009*

**spanish**

Write the correct conjugation of tener for the following sentences: 9. ¿Por qué _________ (Jose) sueño por la mañana? 10. Mi amiga _________ tres hijos. 11. ¿Cómo se dice "Patricio tiene ganas de comer" en inglés? 12...
*May 14, 2009*

**11th Grade chemistry**

How to get pure gold from impure gold..please specify the chemical equation.. any example is fine,e.g. AuCl3 -> Au
*May 13, 2009*

**geography**

Latitude lines measure distance in degrees north and south of this? is it equator?
*April 15, 2009*

**Algerbra**

Thank you
*March 15, 2009*

**Algebra 2**

Thanks
*March 9, 2009*

**Algebra 2**

Thanks reiny for your help.
*March 9, 2009*

**Algebra 2**

and would I do this oen the same way? 7. 2x^4 + 16x
*March 9, 2009*

**Algebra 2**

Thank you. So can that be factored anymore?
*March 9, 2009*

**Algebra 2**

I would really appreciate it someone helped me with this information. 1. Solve the inequality: |3 - 3x/4| >= 9 Solve for x 2.(x - 2)(x + 1) = 4 and factor completely 64 + a^3
*March 9, 2009*

**Algebra 2**

Can someone help me solve this and break it down step by step please??? [Sqrt(x-3)]-[Sqrt(x+2)]=3
*February 16, 2009*

**physics**

a remote controlled car's wheel accelerates at 22.4 rad/s^2. if the wheel begins with an angular speed of 10.8 rad/s what is the wheel's angular speed after exactly 3 full turns?
*February 12, 2009*

**math**

the rainfall this year was 18.6 cm. this is 3.2 cm less than half of the rainfall last year. what was the rainfall last year?
*February 5, 2009*

**Algrebra**

Thank you for your help.
*December 30, 2008*

**Algrebra**

Would the answer be no souliton?
*December 30, 2008*

**Algrebra**

NO it's postive 21
*December 30, 2008*

**Algrebra**

Please faCtor. Thank you for your help. a^2 + 4a + 21
*December 30, 2008*

**11th grade visual art**

first of all this is my first time so i dont know if i am doing it right. I need help i have holiday homework that i need to do but i cant find good enough info for question 1 and i dont understand how to do question 2 below i will write homework exactlty the same as i have it...
*December 5, 2008*

**10th grade math**

23.333333333333333333333333333333 ... i think
*November 28, 2008*

**calculus**

consider the following function: f(x)=sqrt(50-x) find the linear approximation of f(x) at a=1
*November 13, 2008*

**chemistry**

a metal sample weighing 45.0g and at a temperature of 99.1C was place in 38.6g of water in a calorimeter at 25.0C. the calorimeter reached a maximum temperature of 32.8C. 1. calculate the specific heat of the metal. 2. what is the approximate molar mass of the metal?
*November 13, 2008*

**Chem**

A) 8 - 3.45 = 4.55 B) 29 - 25.30 = 3.70 C) 29 - 21.15 = 7.85 D) (I had the same homework) 1.effective nuclear charge 2.principle quantum number
*November 7, 2008*

**Math**

There is a long fence along the border of 2 mens property. 1 man is using the existing fence to make a cattle pen. He has 500 ft of fencing. Suppose the pen extends x ft away from the existing fence along the border. Find an expression for the area in terms of x.
*October 26, 2008*

**physics**

resists motion
*October 15, 2008*

**physics**

The force of ..... acts to transfer mechanical energy to thermal energy.
*October 15, 2008*

**history**

i need to know some specific info like what was damaged, how many people died, how many people got injured, etc.
*September 10, 2008*

**history**

thanks!
*September 10, 2008*

**history**

can you give me more info for 9/11 (patriot day)?
*September 10, 2008*

**math ( Ms,Sue)ans i got**

for part 2 of the questions is it six $1.00 stamps + one $2.50 + one $1.20 and four $4.00 and how do i find the largest number of stamps that she can use from the collection to post a parcel and to list them
*May 22, 2008*

**math**

in a series of stamps annie must buy six of each one cost $4.00 one cost $2.50 one cost $1.20 one cost $1.00 she had to post a parcel and totals cost of postage was $25.70.what stamps can she use from the selection to make up this amount using a)as many $4.00 stamps as ...
*May 22, 2008*

**chem**

For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the temperature is increased. PCl5(g) <===> PCl3(g) + Cl2(g) a) What is the sign of S° for the reaction? Explain. b) What change, if any, will occur in ...
*April 29, 2008*

**Brainteaser**

It could be. I think the question leaves too much to the imagination!
*April 16, 2008*

**Brainteaser**

A man is on his hands and knees looking for a £5 note he has dropped. His search for the fiver continues for some time. Finally in the corner of the room he finds it. What is the first thing he does? Anyone know this?????
*April 16, 2008*

**language arts**

a person who studies and collects rocks for fun
*March 17, 2008*

**Chemistry**

Predict the sign of ( ∆H) in each of the following reactions: NH3 (g) + HCl (g) NH4Cl(s) ∆S = +, ∆G = - Fe (s) + Cu+2 (aq) Fe+2 (aq) + Cu(s) ∆S = +, ∆G = - Cl2 (g) + 2Na (s) 2NaCl (s) ∆S = +, ∆G = -
*February 8, 2008*

**science**

Predict the sign of ( ∆H) in each of the following reactions: NH3 (g) + HCl (g) NH4Cl(s) ∆S = +, ∆G = - Fe (s) + Cu+2 (aq) Fe+2 (aq) + Cu(s) ∆S = +, ∆G = - Cl2 (g) + 2Na (s) 2NaCl (s) ∆S = +, ∆G = -
*February 8, 2008*

**chemistry**

sorry, didnt even see that. how does 0.6973 sound?
*February 8, 2008*

**Science**

i want to know how you could get electric to an island in the middle of nowhere.
*December 18, 2007*

**Physics: Equilibrium and Inclined Planes**

12.8
*October 28, 2007*

**Geometry**

okay, thanks anyway.
*October 3, 2007*

**Geometry**

How do you divide a hexagon into 9 congruent parts?
*October 3, 2007*

**Geometry**

Find the value of z. Then find GE and EH and state whether E is the midpoint of line GH. GH = z + 6. EH =2z-4. GE=z.
*September 4, 2007*

**Spanish**

One of the countries in Central America uses Spanish as the official language of the country but also has 23 different Maya groups; each with its own dialect. What country is it?
*September 3, 2007*

**math**

what would x^2+y^2-4x+2y=0 (Equation for a cirlce) be in r^2=(x-h)^2(y-k)^2 form? tnx I will start you off... x^2+y^2-4x+2y=0 x^2-4x+y^2 +2y =0 x^2-4x+ 4 + y^2 +2y+ 4 =+ 4+ 4 (x^2-4x+ 4) + (y^2 +2y+ 4) =8
*June 1, 2007*

**Math**

Hi how would i solve this?? The equation of the cirlce is x^2+y^2-4x+2y=0. Determine the coordinates of the center and the radius of the circle. What do i do? anyone
*May 31, 2007*

**Math**

hi how would we solve a question like this? for the curve with eq'n 2x^2 - x - 1 y= _______________ x^2 - 2x - 3 determina all x- and y-intercepts I assume you meant y = (2x^2 - x - 1)/(x^2 - 2x - 3) both top and bottom factor but there is no advantage gained. However, the...
*May 21, 2007*

**Math**

I have no clue how to do this as no values were given and im confused. can someone explain plz? if x^3-y^3=m and x-y=N, express xy in terms of M and N This is one of those pure manipulation problems. you have to know that x^3-y^3 = (x-y)(x^2+xy+y^2) so n(x^2+xy+y^2)=m (x^2+xy+...
*May 3, 2007*

**math-factoring**

hi i was reading through the tutorials and havent really understood how to factor out a trinomial like 12x^4 - 5x^2y^2 - 2y^4 what would the 1st few steps be? Do a substitution: let v= x^2 and u= y^2 Now you have... 12v^2 - 5uv - 2u^2 (3v -2u)(4v+u) then go back and put the x ...
*May 1, 2007*

**math**

I'm not good at math! I need help with finding a decimal from a fraction. like 1/3, 13/15, 19/32 I can't figure out how to turn it into a decimal! Just divide the numerator by the denominator. Use long division or a pocket calculator. can u help mme because i get f,s ...
*March 13, 2007*

**why is noone answering my question?!?!**

A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b. Put in the points. You ...
*January 28, 2007*

**rational functions**

A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b.
*January 27, 2007*

**rational functions... PLEASE HELPPPPP**

A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b.
*January 27, 2007*

**chem**

what does coefficients in equations mean, in chemical terms? 2NaCl means we have two molecules or 2 mols of NaCl. Most texts caution us not to use molecules but to stick with the latter part of the definition (moles); however, I don't have any problem with saying, 2H2 + 2 ...
*January 25, 2007*

**chemistry 12**

what is the relationship between ka and kb? Kw=ka*kb
*December 16, 2006*

**chemistry**

When 1.0 mol of ammonia gas in injected into a o.50L flask, the following reaction proceeds to equilibrium. 2NH3 <--> N2 (g) + 3H2 (g) At equilibrium, 0.30 mol of hydrogen gas is present. a) calculate the equilibrium concentrations of N2 and Nh3. b) what is the value of ...
*November 26, 2006*

**lord of flies essay approach**

CHEAT
*September 12, 2006*