Wednesday
April 1, 2015

# Posts by jane

Total # Posts: 1,435

CHEMISTRY
is it reasonable to expect the heat of neutralization to be the same regardless of which acid is used? or should we expect each acid and base combination to have its own heat of neutralization?
April 8, 2010

Chemistry
In the neutralization of HCl and NaOH i was instructed to measure the temperature of the acid HCl prior to mixing the reaction components. I was to assume however, that the NaOH solution was at this same temperature. Is this a reasonable assumption?
April 7, 2010

biomechanics
If a kicker produces a torque of 8Nm with her muscles and the resulting angular acceleration of her leg is 20rad/m2, what is the moment of inertia of her leg?
April 6, 2010

Chemistry
Well, I know that the reaction is endothermic, because delta Hº is also positive. I just don't understand why delta G is positive, since the reaction seems to be spontaneous...
April 5, 2010

Chemistry
If delta G for the dissociation of Borax at 30 degrees C (higher than room temperature) is positive, why does it dissolve at room temperature?
April 5, 2010

health
Help!! I am doing an assignment with 3 scenarios and I have got the first 2 but having trouble with the last. I have read through my chapter and searched webmd and other sites and still can't figure it out. Richard has noted over the past several weeks that he is having ...
April 5, 2010

Math
The slope intercept is 1/3 and the y intercept is 4xsquaredk. What is the slope intercept form.
March 30, 2010

The slope intercept is 1/3 and the y intercept is 4xsquaredk. What is the slope intercept form.
March 30, 2010

Trig Math
I need help with this problem. I don't get how to do it or how they got that answer. A force of 50 pounds acts on an object at an angle of 45 degrees. A second force of 75 pounds acts on the object at an angle of -30 degrees. What was the direction and the magnitude of the...
March 29, 2010

Physics
The smallest object visible to the unaided eye is of 100 microns. If you use a microscope of m=1000, what is the size of the smallest object you can now see? (So=25cm) The answer is apparently 100nm. I am still confused as to why. Please help!
March 26, 2010

world history
why are farmers today not as tightly bound by geography and climate as they were in the past
March 26, 2010

space
uummm i want to know how can telescope cxan see so far????
March 25, 2010

inorganic chemistry
In the final step of making the nitro complex it involves the addtion of concentrated HCl. What are the role(s) of the HCl in this step of the synthesis? nitro complex: [Co(NH3)5(NO2)]Cl2
March 22, 2010

Physics
A mass spectrometer is used to separate isotopes. If the bean emerges with a speed of 374 km/s and the magnetic field in the mass selector is 1.5 T, what is the distance between the collectors for 235U+1 and 238U+1? The mass of 235U+1 is 235 u and the mass of 238U+1 is 238 u, ...
March 21, 2010

physics
Two horizontal parallel wires which carry currents I1 = 45 A (top)and I2 (bottom). The top wire is held in position, the bottom wire is prevented from moving sideways but can slide up and down without friction. If the wires have a mass of 9.2 g per metre of length, calculate ...
March 21, 2010

Math
What is 38 tmes 93 divided by 3 minus 4
March 14, 2010

Physics
Nevermind I figured it out thanks.
March 13, 2010

Physics
I am still confused as to which direction the wires will rotate. Using the right hand rule, I found that the magnetic field of both wires will rotate counterclockwise (if you look from above and from the left side).
March 13, 2010

Physics
Two current carrying wires cross at right angles (like a + sign). Wire 1 has current directed horizontally to the left. Wire 2 has current directed vertically up. If the wires are not restrained, what statement best describes the motion of the wires? A) Wire 1 moves out of the...
March 13, 2010

algebra
How do you solve the expotential notation equation 120-6^2/4x8?
March 8, 2010

Physics
We compare a silicon chip to a nerve membrane, with silicon having (about) twice the dielectric constant of the nerve membrane. Which of the following statements is true? A) 1cm^2 silicon chip has a higher capacitance than 1cm^2 nerve membrane. B) 1cm^2 silicon has the same ...
February 28, 2010

PHYSICS
The frequency of an ambulance siren is 700 Hz. If a pedestrian on the side of the road hears the siren at 756 Hz approximately how fast and in what direction is the ambulance moving? The answer is 90 km/h and towards the person..im not sure how to come to this answer though......
February 22, 2010

chemistry
This is a lengthy problem, but I really don't understand it. Any assistance given would be greatly appreciated. An analysis was done on a rock sample to determine its rubidium content. The rubidium content of a portion of rock weighing .350g was extracted, and to the ...
February 15, 2010

geometry honors
precise name of quadrilateral with vertices A(-2,4) B(2,6) C(6,4) D(2,-3)
February 8, 2010

geometry honors
precise name of quadrilateral with vertices A(-2,4) B(2,6) C(6,4) D(2,-3)
February 8, 2010

pre-calculus
Verify the following: tan^2 - sin^2 = tan^2 x sin^2 Thanks.
February 3, 2010

Maths
"How old are your three children?" the maths teachers ask a former student. He is told their ages add to 13, and multiply to give the number on his study door (which they can both see). "i will need to know more", the master days, after a few moments ...
February 3, 2010

Maths
Andrew arranged the number 1, 2, 3, ...11, 12 into six pairs so that the sum ofany two numbers in a pair is prime and no two of these primes are equal. find the primes and the pairs
February 3, 2010

Maths
Using each of the 10 digits 0 to 9 just once, is it possible to form positive integers who se sum is exactly 100?
February 3, 2010

math
that wasn't the right answer. the question asks for "the sum", meaning the minus sign can't be used
February 3, 2010

Physics
Sorry, Ti = 100/(rs-1), not rs - 100!!!!
February 3, 2010

Physics
Any ideal gas temperature may be written as T = Ti*r where Ti=temp at ice point and r = lim(P/Pi) at constant V. Show that the fractional error in T is dT/T = dr/r + 3.73 drs/rs where r s = lim(Ps/Pi) at constant V. Ps is pressure at steam and Pi is pressure at ice point. Also...
February 3, 2010

English
okay I'll try that. Thank you!
January 30, 2010

English
Thank you! Now I know that he actually does exist. I seem to find little websites like the one you provided for me, and I have to write a 10 page paper on him. Do you have any idea where I could find an abundant amount of information on him?
January 30, 2010

English
I have to do a report on a poet, John Grey. He is Australian and i cannot seem to find him anywhere on the internet! Is it possible that it may be John Gray? I am very confused and need some help on this assignment! Thank you.
January 30, 2010

reimbursement methodolgies
January 26, 2010

chemistry
Never mind, I figured out how to do the problem.
January 26, 2010

chemistry
A .4791 g sample was analyzed and found to contain the following masses of elements: carbon, .1929 g hydrogen, .01079 g oxygen, .08566 g chlorine .1898 g Determine the empirical formula of the new compound.
January 26, 2010

Biology202- (Nursing Student)
Ms. Sue, this is BIO 202 which is taken by future doctors, nurses, and other healthcare workers. All Jessie asked for was some help, not your smart attitude. Thank you.
January 26, 2010

Algebra 2
a computer manufacturer needs to change the dimensions of its foam packaging for a new model of computer. the width of the original piece is three times the height, and he length is equal to the height squared. The volume of the new piece can be represented by the equation V(h...
January 24, 2010

Chemistry
A gas containing sulfur and fluorine analyzed as 29 % sulfur. A 140 g sample of a gas occupied a volume of 50.1 L with a pressure of 478.80 torr at 296.00 K. Enter the molecular formula of the compound.
January 19, 2010

Chemistry
A gas containing sulfur and fluorine analyzed as 29 % sulfur. A 140 g sample of a gas occupied a volume of 50.1 L with a pressure of 478.80 torr at 296.00 K. Enter the molecular formula of the compound.
January 19, 2010

Accounting
Provide the names of different software programs for each type of saoftware
January 19, 2010

software
Identify the different types of accounting software
January 19, 2010

Law & Ethics
January 12, 2010

Chemistry
If a sample of Helium gas is collected over water, what is the pressure of the dry gas alone if the total pressure is 760.0 mmHg and the partial pressure of water is 20.0 mmHg?
January 10, 2010

Algebra Pizzaz
Allegro is French for fast
January 7, 2010

Health
Who first discoverered SIDS and when? i have looked everywhere for this and still cannot find it!
January 5, 2010

Maths
i looked at the site, now i'm really confused, could you just show me the answer and working out, we haven't done the foil method in school we do it differently.
January 1, 2010

Maths
Please can you expand and simplify the following: (2x-5)(x+3) Many thanks. Happy New Year
January 1, 2010

Pre Cal
What is the value of: sin^-1 0.6349, sec^-1 0.5496, tan^-1 0.3457
December 23, 2009

science/physics
Then, don't forget to multiply the velocity by the mass to find the momentum.
December 10, 2009

Chemistry
One last question.... Which of these two metals (Aluminum or Copper) would be a better choice to make silverware out of? Specific heat of: Al = .901 Cu = .39 my guess was the aluminum, because it would take longer for it to get hot, since it requires more heat. This would ...
November 30, 2009

AP Chemistry
thanks :] its a weird question, I must add :-/
November 30, 2009

AP Chemistry
One last question.... Which of these two metals (Aluminum or Copper) would be a better choice to make silverware out of? Specific heat of: Al = .901 Cu = .39 my guess was the aluminum, because it would take longer for it to get hot, since it requires more heat. This would ...
November 30, 2009

AP Chemistry
But what if we weighed the metal before?
November 30, 2009

AP Chemistry
okay, so i'm working on a specific heat lab right now. I have one question that I am really stuck on... Here it is: Why should the metal be dry before dropping it into the calorimeter? ... is it because it affects the heat of the cube or it affects the mass of water? ... i...
November 30, 2009

AP Chemistry
okay, so i'm working on a specific heat lab right now. I have one question that I am really stuck on... Here it is: Why should the metal be dry before dropping it into the calorimeter? ... is it because it affects the heat of the cube or it affects the mass of water? ... i...
November 30, 2009

Music
what is baroque music???
November 27, 2009

Physical Science
yellow because the mixing of red and green light s makes yelloiw part b is black puting a blue object with red and green light will appear black decause red ,green and blue are primary colors
November 14, 2009

reiny
thanks reiny--but i'm in 6th gr and we r not studying powers..can you help me with a simpler answer without powers?
November 12, 2009

multiplying metrics
im in 6th grade--we have a math problem to multiply 3km x 200m x5 can you walk me thorough how to get the answer? Thanks
November 12, 2009

math
3km x 200m x 5 Can someone help me with this?
November 12, 2009

us history
How did the early people of California change their ways of life as their environment?
November 12, 2009

Physics
A student of weight 661 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude of the normal force FN on the student from the seat is 549 N. (b)What is the magnitude of FN at the lowest point? _________N (c) If the wheel's ...
November 4, 2009

Literature I
The Dove by Ewan McColl Well the dove she's a pretty bird, and she sings as she flies She brings us glad tidings and she tells us no lies Well she flies in the mountains and the valley so low And if you live peaceful then she never will go Come all you young men, take a ...
October 30, 2009

Physics
A puck of mass m = 1.26 kg slides in a circle of radius r = 25.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 2.04 kg by a cord through a hole in the table. What speed keeps the cylinder at rest? _________m/s
October 30, 2009

Literature I
The Dove by Ewan McColl Well the dove she's a pretty bird, and she sings as she flies She brings us glad tidings and she tells us no lies Well she flies in the mountains and the valley so low And if you live peaceful then she never will go Come all you young men, take a ...
October 29, 2009

Physics
The two blocks (m = 37 kg and M = 109 kg) in the figure below are not attached to each other. The coefficient of static friction between the blocks is µs = 0.55, but the surface beneath the larger block is frictionless. What is the minimum magnitude of the horizontal ...
October 28, 2009

Physics
A police officer in hot pursuit drives her car through a circular turn of radius 320 m with a constant speed of 74.5 km/h. Her mass is 55.0 kg. (a) What is the magnitude of the net force of the officer on the car seat? ______N (b) What is the angle (relative to vertical) of ...
October 28, 2009

how much tension must a rope withstand if it is used to accelerate a 1200-kg car vertically upward at .80 m/s^2?
October 24, 2009

math(rational functions application)
The average speed of a jet is 100km/h faster than a cargo plane. To travel 1400km, the cargo plane requires 25% more time than the jet. Find the average speed of the jet. This is the formula I figured out so far. V(average)=V(jet)-V(cargo 100km/h= d/t - d/t 100= [1400km/x] - [...
October 22, 2009

Microeconomics
The new york times reported that subway ridership declined after a fare increase: " There were nearly four million fewer riders in December 1995, the first full month after the price of a token increased 25 cents to \$1.50, than in the previous December, a 4.3 Percent ...
October 21, 2009

Physics
a) Newton's law of motion states that the acceleration acting on a falling body (assuming no other forces) is  x" = -g, where x(t) is the height of the object above the ground, t is time, and g is the gravitational constant. Find a general expression to describe...
October 19, 2009

Physics
a) Newton's law of motion states that the acceleration acting on a falling body (assuming no other forces) is  x" = -g, where x(t) is the height of the object above the ground, t is time, and g is the gravitational constant. Find a general expression to describe...
October 18, 2009

World Econ
I've asked here before, and I'm sorry to say I need help again. Does anyone have a website or knows where I can get graphs of the world's food production and population. I can't find any on google. They have to be recent around 2007-2009. I can't find any ...
October 18, 2009

Calculus
October 16, 2009

What is a good sentence using "terrority"
October 15, 2009

Human Geography
Thanks. Do you know where I can get info about food production in countries, as well?
October 12, 2009

Human Geography
I'm doing a research essay that has to prove how the Malthus theory can be applied to the modern world. I need around 5 countries as examples. They can include contradictions and examples of the theory. What are some countries? I can't use India or China, though.
October 12, 2009

math
But how do I justify my answer/use associative property?
October 6, 2009

math
Use the associative property of addition and the distributive property to justify that a(b+c+d) = ab +ac+ad Help? I don't know what it's asking..
October 6, 2009

science
Technician A and Technician B are examining the same substance. Technician A records the mass, volume, and weight of the substance and decides that it is sugar. Technician B records the melting point, density, and boiling point of the substance and decides that it is salt. ...
September 27, 2009

grammar
Special delicates lingerie detergent is unnecessary. Does this sentence need commas or is this sentence punctuated correctly?
September 21, 2009

eth 125
How can the country best prepare for the changing race and ethnicity of its current and future citizens?
September 10, 2009

math
the function f and g are defined by f(x)=1/2x+5 g(x)=x^2 Evaluate 1.g(3) 2. f inverse (6) 3.fg(2)
September 9, 2009

What is the climax in the book ((Underline or Italicize)---->The Bass, The River, and The Shelia Mant) by D. Wenthrell?
September 8, 2009

Calculus
what is the derivative of If y = x^m and y'= mx^(m-1) y" = ?
September 5, 2009

cook
what are the 3 different types of microorganism
September 4, 2009

Lit
thank you anyways :) someone should right chapter reviews for this book soon.
August 31, 2009

Lit
I know that there are no websites for study guides for the book "Chinese Cinderella" but i really need to review the book. I read it and i just need help finding a website that gives chapter by chapter reviews for it. Thanks :)
August 31, 2009

american government before 1877
senate opponents of the league of nations as proposed in the treaty of versailles argued that it?
June 28, 2009

physics repost
A quantity of an ideal gas is compressed to half" its initial volume. The process may be adiabatic, isothermal or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. doesn't adiabatic mean no work, so it would be...
June 23, 2009

physics
A quantity of an ideal gas is compressed to half" its initial volume. The process may be adiabatic, isothermal or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. doesn't adiabatic mean no work, so it would be...
June 23, 2009

physics
A quantity of an ideal gas is compressed to half" its initial volume. The process may be adiabatic, isothermal or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. doesn't adiabatic mean no work, so it would be...
June 23, 2009

physics repost bobpursley
The energy given off by 300 grams of an alloy as it cools through 50°C raises the temperature of 300 grams of water from 30°C to 40°C. The specific heat of the alloy (in cal/g C ) is: i know Q=CpM(delta T) but what is what? Responses * physics - bobpursley, Monday...
June 22, 2009

physics
The energy given off by 300 grams of an alloy as it cools through 50°C raises the temperature of 300 grams of water from 30°C to 40°C. The specific heat of the alloy (in cal/g C ) is: i know Q=CpM(delta T) but what is what?
June 22, 2009

A 0.21 kg block oscillates back and forth along a straight line on a frictionless horizontal surface. Its displacement from the origin is given by x = (16 cm)cos[(16 rad/s)t + π/2 rad] What force, applied to the block by the spring, results in the given oscillation? why ...
June 19, 2009

physics
A 0.21 kg block oscillates back and forth along a straight line on a frictionless horizontal surface. Its displacement from the origin is given by x = (16 cm)cos[(16 rad/s)t + π/2 rad] What force, applied to the block by the spring, results in the given oscillation? why ...
June 18, 2009