Saturday
August 29, 2015

Posts by Paul


Total # Posts: 822

cnn student news world georgraphy
and why are you unable to listen to the videos on the website?
August 27, 2015

chemistry
Thanks sir! :)
August 27, 2015

chemistry
back again with another analytical Q, the question tells you to prep a 50 mL solution of a 750 ppm iron solution using ammonium iron III oxalate trihydrate (MM: 428.06 as a source of iron. Determine the mass of compound required. I'm assuming you would start with a ...
August 27, 2015

chemistry
first you need to write out the balanced reaction equation of LiOH reacting with CO2. So... 2LiOH + CO2--->Li2CO3 + H2O You start with 920 g CO2 and use this equation to convert to moles CO2 and then to moles LiOH. There are 2 moles LiOH for every 1 mole of CO2. And finally...
August 27, 2015

algebra
Slope of parallel lines are the same. m = -9/2 here so the new line will have a slope of m= -9/2 as well. Through the points (-2,5) y-y1=m(x-x1) y-5=(-9/2)(x--2) y-5=(-9/2)(x+2) y-5=(-9/2)x+(-9) y=(-9/2)x-4.
August 19, 2015

algebra
Get the slope: y2-y1/x2-x1 m= (5-4)/(3-4) m= -1 formula y-y1=m(x-x1) pick a set of points. y-4=m(x-4) y-4=(-1)(x-4) y-4=-x+4 y=-x+8 There is the equation.
August 19, 2015

Dimensional Analysis Chemistry
ahh yes I multiplied by 10^-3 instead lol thank you!
August 19, 2015

Dimensional Analysis Chemistry
want someone to check if this is right, Q: The concentration of lead in drinking water in a home was found to be 2.1x10-9 M. What is the concentration in ppm? ppb? MM=207.2 g/mol. 1 ppm = 1 mg/L. A: 2.1x10^-9 mol/L x 207.2 g/ 1 mol x 1000 mg / 1 g = 4.35x10^-4 ppm. and that is...
August 19, 2015

physics
A bicycle is rolling down a circular portion of a path; this portion of the path has a radius of 8.73 m. As the drawing illustrates, the angular displacement of the bicycle is θ = 0.979 rad. What is the angle (in radians) through which each bicycle wheel (radius = 0.320 m...
August 5, 2015

PSYCH
Unlike the Rescorla Wagner model, Mackintosh's theory of attention states that: A. subjects can learn to pay increased attention to informative CSs. B. subjects can learn to pay less attention to uninformative CSs. C. Both a and b D. Neither a nor b PLEASE HELP
July 16, 2015

math
on monday 464 students went on a trip to zoo .all 9 buses were filled and 5 students had to travel in cars. how many students were in each bus?
May 25, 2015

Mathematics
A motorist drives 80km/h at an average speed of 63km/h. Which average is this: mean, mode, median?
May 23, 2015

physics
If an object is thrown in an upward direction from the top of a building 160 ft high at an initial speed of 30 mi/h, what is its final speed when it hits the ground
May 21, 2015

Organic Chemistry
Oh, the reactant involved is KOH. I forgot to mention that.
May 10, 2015

Organic Chemistry
any o-chemists out there? Some help would be greatly appreciated. So I have this compound, it has 5 C's total, a bromine at one end and 2 methyl groups coming off the 3rd C from the bromine and an OH group at the end. like this: Br-CH2-CH(CH3)2-CH2OH. Now I have to come up...
May 10, 2015

chemistry help meee
okay so I'm given a graph of a melting profile of a macromolecule, it is a sigmoid "s" curve, which states that a protein is cooperative. I have four choices on what the graph will look like if it is uncooperative. 1) Graph 1- straight line with + slope 2) Graph ...
May 7, 2015

math
Of the 6796 students in one school district, 1537 cannot read up to grade level. Among a sample of 812 of the students from this school district, 211 cannot read up to grade level. Find the sample proportion of students who cannot read up to grade level. A. 0.14 B. 0.26 C. 211...
April 17, 2015

physics
A centrifuge for separation of sugar crystals in molasses must exert a force of 6 N/g. If the filter drum has a radius of 350 mm, determine the required speed in the revolution per minute I tried the following F = 6 = 10^-3*a a = 6000 = ω^2*r
April 14, 2015

physics
A centrifuge for separation of sugar crystals in molasses must exert a force of 6 N/g. If the filter drum has a radius of 350 mm, determine the required speed in the revolution per minute I tried the following F = 6 = 10^-3*a a = 6000 = ω^2*r
April 14, 2015

History
What was the goal of the minimum foundation program for education? A. It integrated whites and blacks int he same school system. B.It improved the quality of white-only education. C. It raised taxes. D. It put more money into black schools. @Writeacher please don't help me...
March 24, 2015

physics
a 70 kg block rests on the earth's surface. How much energy is required to move the block very far from the earth, ending up at rest again?
March 22, 2015

Math
V=pi*r*h V=pi*6*12 V=72 pi or roughly 226 ft^3
March 7, 2015

Math
it comes out as 450 for me in the calculator, 300+90+60
March 7, 2015

Math
450 Surface Area of a Box: 2lw + 2lh + 2wh
March 7, 2015

Urgent maths homework help
At a boarding school, in the evening, 9 students always take walks in groups of 3. How can the groups be arranged so that each person walks in a group with every other person exactly once in 4 days? I would like to know whether there is a trick to these type of questions. My ...
February 21, 2015

Introductory Algebra
the length of a rectangle is 7 meters more than twice the width. the perimeter is 68 meters. solve for length and width. I need this step by step using the blueprint...please.
February 11, 2015

chemistry
why would dipole moment increase with temperature for a planar molecule? even though those are inversely related...
February 8, 2015

chemistry
what mass of AgBr is produced when 100.0 mL of 0.150 M AgNO3 is added to 20.0 mL of 1.00 M NaBr?
January 27, 2015

langage arts
Which of the following passages from the novel is most useful in helping you determine what type of ruler general gage is from Johnny remain? Select all that apply A Sam Adams was so happy his hands shook worse then ever B. He was not brilliant, but he was so tyrant C. His ...
December 17, 2014

Math Question
Given tan θ = -8/5 and sin θ < 0, find sin θ, cos θ, csc θ, sec θ, and cot θ.
December 14, 2014

math
0.3 divited by 0.06 is 5. 0.3 goes in to 0.06 5 times
December 11, 2014

capacity problems
80 buckets of water fill a pond each bucket holds 2litres how much water does the pond hold
December 6, 2014

chemistry
How many bonds can each atom make without hybridization? B,N, and O
December 5, 2014

Maths
What side lengths could a rectangle have such that it's area rounds to 20 m squared ( to the nearest 10 )
November 23, 2014

physics
1) How many seconds does it take a car traveling 40 mph, decelerating at a rate of 7 miles per second, to come to a complete stop? 2) How many feet?
November 20, 2014

programming c++
write a simple c++ application that displays different varieties of meal. the application must do the following; I. allow a user to choose a meal, ii. prompt the user of the choice made, iii. display the cost of the food.
November 14, 2014

Algebra
A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.3 x 10^2 um. Find the earthquake's magnitude. Round your answer to one decimal place.
November 7, 2014

social studies
identify 3 kinds of artifacts and explain what they tell us about ancient people.
October 28, 2014

math
3/5 + 3/4 round each fraction and estimate the sum. add the two fraction using a common denominator and then round the result. which estimate is closer to the actual answer.
October 27, 2014

Chemistry
How to convert 24.63cm to nm^2
October 6, 2014

Chemistry
Report 2 decimal places and appropriate units, the molar mass of steric acid (C17H35COOH). Please help
October 6, 2014

Chemistry
How many moles of steric acid are contained in 0.25mL of a hexane solution containing 5.4x10^-4 grams of steric acid/L? (Hint: g/L x L = g/ (g/mol)=mol). Please show your work. Please help. Thank you
October 6, 2014

Chemistry
Report 2 decimal places and appropriate units, the molar mass of steric acid (C17H35COOH). Thank you
October 6, 2014

Chemistry
How many moles of steric acid are contained in 0.25mL of a hexane solution containing 5.4x10^-4 grams of steric acid/L? (Hint: g/L x L = g/ (g/mol)=mol). Please show your work. Please help. Thank you
October 6, 2014

Chemistry
I need help with two problems need helps please!! 1) Calculate the surface area in nm^2 of a water solution contained in a watch glass with a diameter of 5.6cm. Remember that the area of a circles is calculate as A=πr2 and diameter= 2r 2) If a molecule of stearic acid ...
October 6, 2014

Algebra
Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
September 24, 2014

Physics
A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.
September 23, 2014

Physics
If a 6.0keV photon scatters from a fee proton at rest, what is the change in the photon's wavelength if the photon recoils at 90 degrees?
September 23, 2014

Physics
A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?
September 23, 2014

Physics
The Stanford Linear Accelerator can accelerate electrons to 50GeV (50x10^9eV). What is the minimum wavelength of photon it can produce by bremsstrahlung? Is this photon still called an x-ray?
September 23, 2014

Physics
An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photo-electrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the tungsten?
September 23, 2014

Physics
What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?
September 23, 2014

Physics
An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
September 23, 2014

Physics
White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star?
September 23, 2014

Physics
A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?
September 23, 2014

Physics
A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.
September 23, 2014

Physics
If a 6.0keV photon scatters from a fee proton at rest, what is the change in the photon's wavelength if the photon recoils at 90 degrees?
September 23, 2014

Physics
A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?
September 23, 2014

Physics
The Stanford Linear Accelerator can accelerate electrons to 50GeV (50x10^9eV). What is the minimum wavelength of photon it can produce by bremsstrahlung? Is this photon still called an x-ray?
September 23, 2014

Physics
An experimenter finds that no photoelectrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photoelectrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the tungsten?
September 23, 2014

Physics
An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm.
September 23, 2014

Physics
What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?
September 23, 2014

Physics
An FM radio station of frequency 107.7MHz puts out a signal of 50,000 W.How many photons/s are emitted?
September 23, 2014

Physics
White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star?
September 23, 2014

Physics
A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?
September 23, 2014

health
The spinal cord serves as a conduction pathway for impulses going to and from the ________. A. Lungs B. Liver C. Brain D. Heart
September 23, 2014

Physics
Calculate the energy needed to accelerate a spaceship of mass 10,000 kg to a speed of 0.3c for intergalactic space exploration. Compare with the projected energy usage of the Earth in a decade~10^22J? well i don't know how to start the problem
September 14, 2014

algerbra
The participants in a weight-loss class lost the following weights (in pounds) after three weeks of dieting: 1,5,2,1,3,6 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal places...
August 27, 2014

Health
D I think
August 23, 2014

Chemistry
A 2.00g sample of Fe3O4 is reacted with with 8.00g of O2 to produce Fe2O3. a) What mass of Fe2O3 will be produced? b) What mass of Fe2O3 will actually be produced if the percentage yield for reaction is 85% produced?
August 12, 2014

algebra
P=2L+2W;L=68,W=84
August 1, 2014

algebra
The sum of two page numbers on facing page of a book is 81. What are the page numbers
August 1, 2014

mathematics
125,454 dollars take 30% how much is left
July 29, 2014

PSY/410
Thanks Ms. Sue
July 9, 2014

PSY/410
Will someone please check my answer please. Thanks in advance. Match the definitions to the correct theoretical model. 1. ___J__ Experiences as a child affect life. Child is influenced by caretaker but also has a part in development. 2. __F___ 2–3 years of age and the ...
July 9, 2014

PSY/410
Thanks Ms. Sue
July 9, 2014

PSY/410
I need help finding information to this question please. I found some information on Modern Psychology but not Abnormal Psychology. Thanks in advance. Create a timeline that displays the development of abnormal psychology. Include at least five to seven main milestones.
July 9, 2014

Chemic
so how much sulphuric acid ml need and how much water?
July 8, 2014

Chemic
Hello could you help me answer to one question please. From 98% Sulphuric acid to make 50ml 5% sulphuric acid How to DIlute with water , how much need ?
July 8, 2014

Psy/405
I need help locating information for these questions please. Describe the differences between dispositional and evolutionary or biological personality theories. Discuss the strengths and limitations of dispositional and evolutionary or biological personality theories as they ...
June 24, 2014

English please help me
Please help me to correct my English grammar. thank you. June 17, 2014 Dear sir, Good day, I regret when I resigned from your company but it’s my family’s reason. I am now presently working here in Maldives as a professional photographer and salesman as well. I ...
June 17, 2014

PSY/405
Hello, I need help finding information for my PowerPoint Presentation. Thanks in advance Create a 10- to 12-slide Microsoft® PowerPoint® presentation, including detailed speaker notes,on traditional and contemporary psychodynamic theories. Include the following for ...
June 10, 2014

Biology Please help
Pleiotropy
May 23, 2014

math
Hello there, im doing an equation and its mind boggling me badly so i want to see if im doing something wrong or not. It goes like this: sinx - Squareroot of 3/2 > 0 x € [0,2pi) i start by moving the sqroot of 3.. so i have sinx >sq3/2. as of that my resaults are 1,...
April 29, 2014

Science
the force you would need to accelerate an object with high mass quickly is the biggest one.
April 29, 2014

Physics
thank you very much ! i got it half the way but couldnt figure out how to finish it .
March 31, 2014

Physics
A steel ball hangs in a 147cm thread which is dragged right and then let go. Velocityh of the ball is 2,44m/s when it goes through the middle position. I dont have any mass given up. How many degrees to the side had the ball been dragged?
March 31, 2014

Physics
In a cyclotron (one type of particle accelerator), a deuteron (of mass 2.00 u) reaches a final speed of 10.1% of the speed of light while moving in a circular path of radius 0.540 m. What magnitude of magnetic force is required to maintain the deuteron in a circular path?
March 27, 2014

math
450 divide 14?
March 27, 2014

Math
Write the multiples of 7 through 70:
March 27, 2014

6th Grade Math
A drawer contains 3 blue ribbons, 4 red ribbons, and 3 green ribbons. A ribbon is randomly chosen from the drawer, replaced, and another ribbon is chosen. Find each probability"
March 26, 2014

math
Hoe do you do 450 divide14?
March 25, 2014

Physics
Ten cars at an intersection are blowing their horns simultaneously, creating a 98 decibel sound in the middle of the intersection. What is the average sound level for each car?
March 20, 2014

Physics
A train blows its horn as it approaches a crossing. The train engineer observes a frequency of 118 Hz and a stationary observer observes a frequency of 122 Hz. What is the speed of the train? Use the speed of sound as 340m/sec
March 20, 2014

Physics
If a piano tuner hears 3 beats each second when listening to a 8 Hz tuning fork and a single string on the piano which is of higher frequency.. What is the frequency of the single string from the piano?
March 20, 2014

Finance
Anderson International Limited is evaluating a project in Erewhon. The project will create the following cash flows: Year Cash Flow 0 –$690,000 1 243,000 2 175,000 3 256,000 4 231,000 All cash flows will occur in Erewhon and are expressed in dollars. In an attempt to ...
March 19, 2014

Finance
Handy Enterprises has gathered projected cash flows for two projects. Year Project I Project J 0 –$215,000 –$215,000 1 104,000 75,000 2 93,000 86,000 3 79,000 96,000 4 72,000 105,000 Requirement 1: At what interest rate would the company be indifferent between the ...
March 19, 2014

physical science
Suppose you are camping in the mountains and you need to melt 1.8 kg of snow at 0.0 degC to 70.0 degC. The specific heat of water is 4186 j/kg*C while the latent heat of fusion for water equals 3.34 x 10^5 J/kg. How much heat will be needed? Express in KJ.
March 18, 2014

Physics
Smoking causes blood vessels to constrict. If the average blood vessel radius of a smoker decreases 7.6% and the body increases blood pressure to maintain a constant flow. Calculate the needed percent increase in pressure.
March 17, 2014

Physics
An artery supplying heat muscle with blood is occluded to 13.9% of its original radius by a clot. By what percent is the blood flow through this artery reduced.
March 17, 2014

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