Saturday
December 20, 2014

Posts by JEFF


Total # Posts: 644

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

research writing
how do you know when sources are reliable?
May 4, 2008

grade 5 math
the grade 5 class decided to collect cans of food to donate to the food bank .After the 1st week ,they had collected 8 cans . The next week they collected 11 more . By the 3 rd week they had 31 cans Following this pattern how long will it take for them to reach there goal of ...
May 4, 2008

college algebra
I'm not sure, but my answer would be 15. you multiply 18x4=72, 9x3=27, 3x2=6 add them together, it makes 105 divided by 3x2+1=7, so 105 divided by 7=15. I hope it helps
April 13, 2008

college algebra
Could you help me with this long division problem of a polynomial? 18x4+9x3+3x2/3x2+1
April 13, 2008

history
Thanks
April 13, 2008

history
I think it's "B"
April 13, 2008

history
The great French historian Jules Michelet (1798-1874) sympathized with the French Middle Ages and with the Revolutionary epoch in France, yet he wrote his best work on the despotic French monarchy, which he despised. 5) The statement above, if true, would most clearly support ...
April 13, 2008

history
The great French historian Jules Michelet (1798-1874) sympathized with the French Middle Ages and with the Revolutionary epoch in France, yet he wrote his best work on the despotic French monarchy, which he despised. 5) The statement above, if true, would most clearly support ...
April 13, 2008

Math
How do you find surface area of a box?
April 1, 2008

Algebra
(x-3)/5 = (x-3)/x The x-3 is over the 5 and the other x-3 is over the x... I know to cross multiply so I would get 5(x-3)= x(x-3) But then would i just divide (x-3) by both sides? I would assume thats what to do, but the only reason I ask is because my book says the answer is 3,5
March 25, 2008

Algebra
oops it didnt write the question like i wanted it to, here I'll fix it 4x/x^2-9 - 5x/x^2+4x-+3
March 18, 2008

Algebra
I have one more question I need to ask about algebra, this one is a perform the indicated operation question. 4x 5x ----- - ---- x^2-9 x^2+4x-+3 I am really confused on the -+3 part, I don't know if my teacher made a typo or what, because without the - in that part it ...
March 18, 2008

Algebra
Ooo ok thanks so much, I got it :D
March 18, 2008

Algebra
Hi I am in need of help, please... The question says to perform the indicated operation. x^2+2x-3/x^2-9 Divided By x^2-1/x^3-27 I put divided by in the middle to show that it is dividing two rational expressions.
March 18, 2008

History
Did Lyndon Johnson think Eisenhower was a good president?
March 7, 2008

Math
The least common multiple of 96 and 108?
February 19, 2008

Calculus I
A tank in the shape of an inverted right circular cone has height $ 10$ meters and radius $ 8$ meters. It is filled with $ 6$ meters of hot chocolate. Find the work required to empty the tank by pumping the hot chocolate over the top of the tank. Note: the density of hot ...
February 14, 2008

calculus
A ball of radius 10 has a round hole of radius 5 drilled through its center. Find the volume of the resulting solid.
February 12, 2008

calculus-differential equation
Thanks so much. I've been struggling with that thing for days!
February 5, 2008

calculus-differential equation
Consider the differential equation: (du/dt)=-u^2(t^3-t) a) Find the general solution to the above differential equation. (Write the answer in a form such that its numerator is 1 and its integration constant is C). u=? b) Find the particular solution of the above differential ...
February 5, 2008

math
looking to reduce to lowest term 1) 3+x(4+x)/3+x i got 4+x 2)3a^2-13a-10/5+4a-a^2 i got could not reduce any help would be great
December 10, 2007

math
sorry next one is 3a^2-13-10/5+4a-a^2 i got cannot reduce
December 9, 2007

math
a couple more 1) 3+x(4+x)/3+x i got 4+x
December 9, 2007

math
thanks i got could't reduce on the second one the first one the denominator both numbers are to the second power does that matter
December 9, 2007

math
trying to reduce to simpilest form 1.t-a/t^2-a^2 i have 1/2(t+a) 2.3y^3+7y^2+4y/y^2+5y+4 i have cannot reduce thanks
December 9, 2007

Algebra 1
The formula for direct variation is y = kx, where k is the constant of variation. For slope, use y - y1 = m(x-x1)
December 9, 2007

Math x-int's
Wow... that's a long process. Thanks for the help!
December 8, 2007

Math x-int's
How do I algebraically find the x-intercepts for this equation y = x^3 - 3x^2 + 3. I know I need to plug in y = 0 to solve for x. x^3 - 3x^2 + 3 = 0 But where do I go from there? I don't think I can factor, and I don't think I can use the quadratic formula.
December 8, 2007

civics
Gave 2/3 majority of the 13 colonies.
December 4, 2007

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