# Posts by JEFF

Total # Posts: 812

**chemistry**

At atmospheric pressure, a sample of O2 gas has a volume of 55mL at 27 degrees celcius. What volume in mL will the O2 gas occupy if the temperature is decreased 0 degrees C and the pressure is held constant?

*November 24, 2009*

**programming**

I got the the LineScrabble class: import java.io.*; public class LineScrabble extends Echo{ int max = 0; String bestLine = ""; public LineScrabble(String f) throws IOException { super(f); } int[] scrabbles = {1,3,3,2,1,4,2,4,1,8,5,1,3,1,1,3,10,1,1,1,1,4,4,8,4,10}; ...

*November 24, 2009*

**programming**

Can anyone help me with this really confusing programming problem? The board game scrabble works by assigning points to wooden tiles arranged in cells on a board. We'll simplify this considerably, and consider the following question. We begin with the letter-scoring scheme...

*November 24, 2009*

**physics**

A children's merry-go-round in a park consists of a uniform 200kg disk rotating about a vertical axis. the radius of the disk is 6 m and a 100kg man is standing on the outer edge when the disk is rotating at a speed of 0.20rev/s. how fast will the disk be rotating if the ...

*November 21, 2009*

**physics**

a uniform disk and a uniform sphere are rolled down an incline plane from the same point and intially they are at rest. Find the difference in time they arrive at a mark on the plane which is 6 meters from the starting point. The sphere has twice the mass and the same radius ...

*November 21, 2009*

**physics**

a uniform disk and a uniform sphere are rolled down an incline plane from the same point and intially they are at rest. Find the difference in time they arrive at a mark on the plane which is 6 meters from the starting point. The sphere has twice the mass and the same radius ...

*November 21, 2009*

**AP Physics B**

The college board website only has exams from 1999 to last years. Some how my teach has gotten ahold of the free response questions from like 1980 and he said that they are open to the public and can be found on the internet. I can't seem to find were they are all the ...

*November 17, 2009*

**PreCalculus**

why is -sin(380)/cos (380) equal to -tan(200) I don't see how it's 200 wouldn't it be -tan 380

*November 15, 2009*

**calculus**

calculate the lim as x-> pi (cos(x)+1)/(x-pi) using the special limit lim x->0 sinx/x

*November 13, 2009*

**Business**

Using the financial statements for the Goodyear Calendar Company, calculate the 13 basic ratios found in the chapter. GOODYEAR CALENDAR COMPANY Balance Sheet December 31, 2008 Assets Current assets: Cash...

*November 9, 2009*

**business**

Using the financial statements for the Goodyear Calendar Company, calculate the 13 basic ratios found in the chapter. December 31, 2008 Assets Current assets: Cash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 40,000 Marketable ...

*November 9, 2009*

**business**

Using the financial statements for the Goodyear Calendar Company, calculate the 13 basic ratios found in the chapter.

*November 9, 2009*

**calculus**

If you plug in x=1, you find that f(x)=4x^3-36x^2+96x-64 evaluates to zero. From here, use either synthetic division or long division to get the quadratic 4x^2-32x+64. Reduce to x^2-8x+16 and solve by factoring into (x-4)^2. So 4x^3-36x^2+96x-64=4(x-1)(x-4)^2.

*November 9, 2009*

**5th Grade Math**

I found the same problem in my son's math homework when he learned LCM. That's maybe why my son used LCM to solve it. I used similar way to Reiny's. i.e. Nick's speed: 1/8. Isah's speed : 1/10. When Nick passed Isah for the second time, Nick will run 1 more...

*November 5, 2009*

**Organic chem**

Oxymercuration/reduction? Not sure anymore...

*November 4, 2009*

**chemistry**

What is the hamiltonian for a Lithium atom?

*November 3, 2009*

**chenistry**

State whether each of these functions is symmetric, antisymmetric, or neither, with respect to the interchange of coordinates 1 and 2: (a) g(1)f(2) b)(r1-r2)e^-br12 where r1 and r2 are vectors describing positions of two points and r12 is the distance between them |r1-r2|

*November 3, 2009*

**chemistry**

Calculate the angle which the spin angular momentum of a single electron forms with the z axis in alpha and beta spin states. What are the possible angles of the spin angular momentum for a two-electron triplet state

*November 3, 2009*

**Physics**

Does blue light or orange light have a larger index of refraction? Blue light is bent more by a prism than orange light. Does blue light or orange light have a larger index of refraction in glass? A. Blue B. Orange If you know the answer to this, could you also explain why? ...

*October 29, 2009*

**math**

i am a number between 7 000 000 and 8 000 000 all my digits are odd all the digits in my thousands period are the same all the digits in my units period are the same the sum of my digits is 31 what number am i ?

*October 27, 2009*

**calculus**

A flag pole is 40 feet high and stands on level ground. a flag is attached to a 120 foot rope passing through a pulley at the top of the flagpole. The other end of the rope is tied to a car at ground level. If car was driving directly away from flagpole at 3ft/sec, how fast is...

*October 26, 2009*

**College Physics**

Yes I know of using that equation but the acceleration is not constant so I can't just plug in into an equation with a different x value.

*October 25, 2009*

**College Physics**

The only force acting on a 3.9 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s. (a) What is the velocity of the body at x = 4.0 m? (b) At what positive value of x will the body...

*October 25, 2009*

**Algebra**

the lenght of a rectangle is fixed at 19 cm. What width will make perimeter greater than 70 cm?

*October 13, 2009*

**college physics**

In the figure below, two point particles are fixed on an x axis separated by a distance d. Particle A has mass mA and particle B has mass 2.00mA. A third particle C, of mass 90.0mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at what x ...

*October 11, 2009*

**calculus**

Find the lim x->infinite (x/[3x+5]) where [] denotes the greatest integer function use the squeeze theorem.

*October 5, 2009*

**6th grade**

15

*September 22, 2009*

**physics**

Really, no one?

*September 22, 2009*

**physics**

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s? I tried solving using s=Vit + (.5)at^2 but I can't find ...

*September 22, 2009*

**math 8**

9y + 4==2y+25

*September 15, 2009*

**health**

please define: Emotional Health

*September 9, 2009*

**chemistry**

A sealed flask contains 0.40 g of water at 28 deg. celsius. The vapor pressure of water at this temperature is 28.36 mmHg

*September 6, 2009*

**Science (Physics)**

(a) What is the initial velocity of the green car? (b) What is the acceleration of the green car? Sorry I forgot to post the actual questions.

*September 3, 2009*

**Science (Physics)**

A red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 220 m. If the red car has a constant velocity of +20 km/h, the cars pass each ...

*September 3, 2009*

**French response to mathmate**

Here are the corrected answers to the first post. Thank you so much for all the help!! :)) 1. Quelle jupe plissée 2. Quel chemisier 3. Quel pull 4. Quelle paire de chaussures 5. Quel manteau 6. Quelle chemise à manches à longues 7. Quel jean 8. Quel anorak...

*September 2, 2009*

**World History RESPONSE to Writeacher**

The answers 1559 right??

*September 2, 2009*

**World History**

Could you help me with this question: What year did the act of Uniformity get put into effect?

*September 2, 2009*

**Organic chemistry**

is it harder to obtain the magnetic resonance signal of a C-13 nucleus than an H-1 resonance signal at the same sample

*September 1, 2009*

**biochemstry**

Which of the following substances serves as an intermediate through which all cellular energy sources are interconvertible? acetyl CoA glucose pyruvate citrate

*September 1, 2009*

**Physics Problem**

shut up!

*August 30, 2009*

**physics**

Consider this set of quantum numbers: n = 3, l = 2, ml = -1, ms = +½ The maximum number of electrons in an atom which can share the above set of quantum numbers is

*August 15, 2009*

**physics**

In Bohr's model of the hydrogen atom, the radius of an orbit a. is proportional to n2. b. is smallest for the highest energy state. c. increases when a photon of light is emitted from an excited atom. d. can have any value that is larger than the ground-state radius. e. ...

*August 15, 2009*

**chemistry**

A sample of hydrogen gas was collected over water at 36°C and 855 mmHg. The volume of the container was 6.50 L. Calculate the number of moles of H2 collected. (Vapor pressure of water is 44.6 torr at 36°C)

*August 15, 2009*

**calculus**

find the lim x->0 (e^(-x) -1) / (1-e^x) i did this using a table and the found the limit but is there a way to do this algebraically

*August 2, 2009*

**History**

Explain why the development of printing was described as a "revolution."

*July 26, 2009*

**calculus**

Need help with the following proof: prove that if lim x->c 1/f(x)= 0 then lim x->c f(x) does not exist.I think i need to use the delta epsilon definition i am not sure how to set it up.

*July 26, 2009*

**cook/dynamics of catering**

in america table service, which server is doing the job correctly?

*July 25, 2009*

**Math**

a parabola has vertex (-6,-12) AND PASSES THROUGH (6,24) find its equation in the form ax^2+bx+c

*July 21, 2009*

**algebra**

how much of a 25% solution should to be added to 35% solution to get 40 liters of 28% solution

*July 21, 2009*

**Math**

if y = (3x^3 -12x^2 + 2x -8)/(x-4) find the derivative y'

*June 30, 2009*

**calculus**

is the function f(x)=x^2 increasing on decreasing at x = -1. can anyone please check my reasoning: the value of the derivative of the function at x=-1 is -2, so that means the slope of the tangent line to the graph at that is a negative value so the function is decreasing at x...

*June 29, 2009*

**Organic chemistry**

compound with a molecular formula C8H16O has the following H-nmr spectrum: 3H triplet at 0.90, 1.0 to 1.6 8H multiplet, 2.05 3H singlet, 2.25 2H triplet. What is the structure of this compound? I think it is 2-octanone but not sure

*June 20, 2009*

**calculus**

Find the area of bounded by f(x)=2x^2 and g(x)=x^4-2x^2

*June 18, 2009*

**calculus**

Find the area of bounded by f(x)=2x^2 and g(x)=x^4-2x^2

*June 18, 2009*

**English**

Do you think downloading music is legal? I think it is as long as it is only for private use or only sharing with friends. What do you guys think?

*June 5, 2009*

**Math**

A tank has cross-sections in the form of isosceles triangels, vertex down. The top of the tank is 6ft wide, its height is 4ft, and its length is 10ft. find the work in pumping all the water to the top of the tank. (weight of water is 62.4 pounds per cubic feet) here is my ...

*May 29, 2009*

**chemistry**

Which of the following is NOT true about the thermodynamic standard state? A. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A gas is in its standard state when ...

*May 17, 2009*

**chemistry**

So 2.8 converted to mols and then divided by 517? And multiplied by 25oC?

*May 9, 2009*

**chemistry**

2.8 g of the nonvolatile solute sucrose (C12H22O11) is added to 517 g of water at 25oC. What will be the partial pressure of the water vapor over this solution?

*May 9, 2009*

**chemistry**

Thank you.

*May 7, 2009*

**chemistry**

At a low pressure and a high temperature, what state of a substance is most likely to exist? Gas Liquid Solid

*May 7, 2009*

**chemistry**

*This is the second part of the question Predict whether the enthalpy of fusion of C2H6 will be larger than, less than, or the same of that of methanol.

*May 7, 2009*

**chemistry**

thank you

*May 7, 2009*

**chemistry**

The enthalpy of fusion of water is 6.0 kJ/molrxn and that of methanol (CH3OH) is 3.2 kJ/molrxn. Which solid, water or methanol, has the larger intermolecular forces? Predict whether the enthalpy of fusion of C2H6 will be larger than, less than, or the same of that of methanol.

*May 7, 2009*

**Social Studies**

How does the incentive of greater profits affect the quantity supplied?

*May 4, 2009*

**Science**

I have to do a project with a science related career (that doesn't necessarily mean a scientist, but someone who uses science frequently). What do you call a scientist who studies the science of music? I've google this but I couldn't find any results, but I know ...

*April 24, 2009*

**Chem1C**

What is the pH of a 0.050M triethylamine, (C2H5)3N, solution? Kb for triethylamine is 5.3 x 10^-4 I have no idea how to start this, thanks.

*April 22, 2009*

**physics**

You are in a hot-air balloon that ascends at a constant velocity of 2.00 m/s. When the ballon is 1000 meters in the air you jump out of it what speed will you hit the ground with? neglect air resistance. I know we use the conservation of mechanical energy to solve this my ...

*April 19, 2009*

**physics**

A centrifuge has an inertia rotation of 7.24 * 10-3 kilogramsm2. How much energy must be supplied to take it from rest to 419 rad / s? KE = (1/2)(7.24 * 10-3)(419^2) is this correct.

*April 10, 2009*

**8th grade**

mooo mooo little star

*April 1, 2009*

**Sociology**

I'm sorry but that link does not help me. If you could provide a link with EXAMPLES of micro-sociological questions, that would be helpful. And yes, I have already tried googling 'Microsociological question examples'

*March 23, 2009*

**Sociology**

I'm currently writing an essay for a Sociology class(Sociology of Everyday life), my topic was on love and prior to the essay we had to write three proposals for our essay addressing our topic with a focus on the micro-sociological aspect of it. The problem is all three of...

*March 23, 2009*

**abraham rattner**

i googled leepa rattner musuem, and it's under galleries. thanks.

*March 18, 2009*

**abraham rattner**

how would i interpret the painting "Double Portrait" by rattner?

*March 18, 2009*

**physics**

above the earth, a 500nT magnetic field captures particles coming from the sun. If a proton moving at 600km/s runs into this magnetic field, what is the radius of motion of the proton? and also how long does it take the proton to travel in one circle?

*March 12, 2009*

**Chem**

I went through the periodic table several times, and I could not find oxalate!!! Where is it? Thank you.

*March 8, 2009*

**physics**

thanks for the check!

*March 8, 2009*

**physics**

equation is: n1sino1=n2sino2 (o means theta) ______________________________ Given info: So n1=1.5 n2=1.0 o1(incident angle)=20 solve for o2 Can you check this: n1sin20=n2sino2 1.5x0342=1sino2 .513=sino2 inverse sin(.513) o2=30.86 degrees is this right?

*March 8, 2009*

**physics**

1. Calculate the frequency (Hz) and energy (eV) of green photons with wavelength of 555nm. Photon energy = hν, where ν = frequency in Hz and h = 6.626x10-34 joule-sec, the Planck’s constant. Keep in mind that: wavelengthxfrequency = speed. 2. Andy Ruddick can ...

*March 1, 2009*

**Chemistry!**

Frank Steelman Office: Phone or Course Chat Office Hours: By appointment - as needed by the student. Phone: 609-204-0359

*February 25, 2009*

**Math**

Find the slope of the line that goes through the given points. I think I figured out the answer but I would appreciate any feedback thanks! (3,-2),(-1,-6)

*February 23, 2009*

**math**

If y = u+ 2e^u and u = 1+lnx, find dy/dx when x= (1/e) ?

*February 23, 2009*

**physics**

-Using a digital camera, you are taking a picture of your 1.80meter-tall friend standing at a distance of one meter from you. From the camera manual, you learned that the size of the sensor (electronic film) is 6mmx8mm. In other words, the sensor is rectangular with 6mm on one...

*February 22, 2009*

**10th grade**

Mixing the two is simply and acid base reaction. CH3COOH + NaHCO3 ---> CH3COONa + H2CO3 That last product is carbonic acid which quickly decomposes into carbon dioxide and water: H2CO3 ---> H2O + CO2 The CO2 is what you see foaming and bubbling in this reaction.

*February 17, 2009*

**college/ vet assistant**

relating to the biting surface of a molar or premolar tooth

*February 17, 2009*

**college/ vet assistant**

Lingual describes speech sounds formed with the tongue

*February 17, 2009*

**Algebra**

Ok! Have a good night and thanks for the help!

*February 17, 2009*

**Algebra**

That makes sense..High School?

*February 17, 2009*

**Algebra**

Are you a math teacher? Just wondering?

*February 17, 2009*

**Algebra**

So which is the correct method? Switching the original, or just using variables as i did to make the equation true 4x-y = 7 4(2) - 1 = 7 (2,1) 4(3) - 5 = 7 (3,5) 4(4) - 9 = 7 (4,9) Which method is correct? Or does it not matter because the equation has infinate solutions? Thanks!

*February 17, 2009*

**Algebra**

Even though you switched it to the y = 4x - 7? Is this all the same or is the -7 and 7 the constants changed? Thanks

*February 17, 2009*

**Algebra**

Would (2,1) (3,5) and (4,9) work as well? Thanks!

*February 17, 2009*

**Algebra**

4x - y = 7 I need ordered pairs for this linear equation, I was wondering of some possible solutions. Thanks!

*February 17, 2009*

**physics**

Charges A through E have a charge of either + or - 5mC. They are placed at regular intervals along a semicircle of radius 7cm. Find the magnitude and direction of the force exerted on an electron placed at the center of the circle. Find the electric potential at the center of ...

*February 10, 2009*

**chemistry**

A + B -> C + D (reversible reaction) a 2L container contains 1 mol of C, 1.6 mol of D, 0.8 mol of A snd 0.8 mol of B. Calculate the equillibrium composition of the reaction. Kc =0.065 I think C and D are forming A and B because there is higher concentration of C and D. So ...

*January 29, 2009*

**chemistry**

A + B -> C + D (reversible reaction) a 2L container contains 1 mol of C, 1.6 mol of D, 0.8 mol of A snd 0.8 mol of B. Calculate the equillibrium composition of the reaction. Kc =0.065 I think C and D are forming A and B because there is higher concentration of C and D. So ...

*January 29, 2009*

**Math**

Express 5.6 x 10 (minue two squared) in standard notation

*January 25, 2009*

**Math**

Please help me with this question: What is the supplement of 125degrees?

*January 25, 2009*

**math**

wouldn't the answer be 1?

*January 25, 2009*

**chemistry**

NH4HS(s)-> NH3(g) + H2S(g) What direction does the equillibrium shift when NH4HS is added? I think that the equillibrium won't shift since we are adding a pure solid and pure solids are not included in the equillibrium expression. Just want to make sure.

*January 23, 2009*