Monday
September 1, 2014

Posts by JEFF


Total # Posts: 573

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

physics
A frictionless track with a loop of radius 36 cm sits on a table 0.9 meters above the ground. If a 0.15 kg object just makes the loop, how high above the table did the object start and how far from the table does it land? Can you check my work Mgh - Mg(2R) = 0.5MV^2 gh - 2gR...
December 22, 2008

physics
A 4.74 kg spherical ball with radius 1.4 cm rolls on a track with a loop of radius 39 cm that sits on a table 1.2 meters above the ground. The last 1 meter section of the track is horzontal and is not connected to the rest of the track. 0.33 meters of this section of the track...
December 21, 2008

physics
A 4.74 kg spherical ball with radius 1.4 cm rolls on a track with a loop of radius 39 cm that sits on a table 1.2 meters above the ground. The last 1 meter section of the track is horzontal and is not connected to the rest of the track. 0.33 meters of this section of the track...
December 21, 2008

physics
A bench is made of a 3 meter long plank with a mass of 12kg and 2 sawhorses(each 0.2m from an end).There are two boxes on the bench. A 15kg box is 0.8 meter from the left hand side. A second box is 0.5 m from the right hand side. What would the mass of the second box have to ...
December 8, 2008

physics
A bench is made of a 3 meter long plank with a mass of 12kg and 2 sawhorses(each 0.2m from an end).There are two boxes on the bench. A 15kg box is 0.8 meter from the left hand side. A second box is 0.5 m from the right hand side. What would the mass of the second box have to ...
December 7, 2008

Math
* disregard the caffeine comment. sorry about that.
November 29, 2008

Math
I have this exact same question, but in my assignment I'm told I have to make a table of values, graph whatever it is, find the x&y intercepts, find the domain and range, determine whether it's increasing or decreasing, the equation of the asymptote, and what is the ...
November 29, 2008

math
I need Help With Time
November 17, 2008

physics
A 5 kg box is pushed against a K= 40 n/m spring on a horizontal surface and the spring is compressed 0.12m. The box is released and travels for 1.4 meters before comin to a stop. What is the coefficent of friction between the floor and the box. How fast was the box moving when...
November 16, 2008

physics
a block is held 1.3m above a spring and is dropped.The spring compresses 6cm before sending the ball into the air. How fast is the ball going when it hits the spring? What is the spring constant? How high in the air does the ball go after hitting the spring?
November 6, 2008

physics
a box whose mass is 0.3 kg is pushed against a spring(k=40n/m) on a horizontal surface and the spring is compressed 0.12m. The box is released and travels for 1.4 meters before coming to a stop. What is the coefficient of friction between the floor and the box? How fast was ...
November 6, 2008

Science
How is it that clothes can dry on the clothesline at temperatures well below freezing?
November 2, 2008

physics
An arrow with a mass of 0.12 kg is pulled back in a bow. After being held still, it is let go, moving at 23m/s after the 0.51meters in which the arrow is in contact with the bow string? What work was done on the arrow by th bow string? What force was exerted by the archer to ...
November 2, 2008

Math
[(x^3)+(2x^2)-x-2]/(2x-5)
November 2, 2008

Physics
how do you solve for v ?
October 13, 2008

physics
what happen to the value g (free fall). If the rocket has launch from Earth to moon with the constant velocity. What if the rocket acclerating?
September 17, 2008

physics
An old-fashioned single-play vinyl record rotates on a turntable at 34.0rpm . What are the angular velocity in rad/s and the period of the motion?
September 8, 2008

Chemistry
Consider a 27.5g piece of ice at 0.00C. a) how much heat is required to convert the ice to water that is also 0.00 C? b) how much heat would be required to warm this water from 0.00 C to 17.50 C? I don't understand the process of how to go about solving this problem.
September 7, 2008

chemistry
a) how much heat is required to convert the ice to water that is also 0.00 C? b) how much heat would be required to warm this water from 0.00 C to 17.50 C? HELP!! I think the fusion is 333 J/g at 0 C... But I'm not sure what to do with that.
September 7, 2008

Chemistry
is Hf triangleH'f?? and if so would the value be -285.83? for b, would we want the specific heat of h2o (l) or (s)?
September 7, 2008

Chemistry
Consider a 27.5 g piece of ice at 0.00 C. a) how much heat is required to convert the ice to water that is also 0.00 C? b) how much heat would be required to warm this water from 0.00 C to 17.50 C? HELP!! I think the fusion is 333 J/g at 0 C... But I'm not sure what to do ...
September 7, 2008

English
Is the following sentence (a) fragment, (b) run on sentence, (c) commas splice, (d) complete sentence? Although zone-delivered pricing is a plan under which customers living outside the seller's primary trading area pay the cost of delivering their purchases to them
September 7, 2008

physics
A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.10s later. What was the rocket's acceleration?
September 6, 2008

Physics
n apple and feather free fall in a evacuated chamber. The apple and feather are released from the top. Suppose the camera opened flash every 1 s. (1)Suppose A1 is the distance from t = 0s to t = 1 s, A2 is the distance from t = 1s to t =2s, A3 is the distance from t = 2s to t...
September 3, 2008

biology
Why does cell need enzymes?
September 1, 2008

Social Studies
madistat serverriov
August 27, 2008

Social Studies
madistat serverriov
August 27, 2008

math (calc)
At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 25 km/h. How fast is the distance between the ships changing at 4:00 pm. Find the intervals of increase or decrease find the local maxiumum and minimum values find the ...
July 8, 2008

english
in uncle toms cabin why does eliza think its safe to stop for food at the farmhouse
June 29, 2008

English
Can someone use the word myriad in a sentence? I know it's kind of a dumb question but I'm really stuck
May 26, 2008

history
this is a question about anne frank who was martin kelper? can not find anything about him
May 22, 2008

research writing
This is helpful, thanks Christine
May 4, 2008

research writing
thank you
May 4, 2008

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