Thursday
December 18, 2014

Posts by Anna


Total # Posts: 2,061

physics
a 2kg pendulum swings at the bottom of a 1m rope. hen the pendulum is at the bottom of the swing, it is traveling at 2 m/s. determine the tension of the rope
January 18, 2012

math
Enter in standard form the equation of the line passing through the given point and having the given slope. B(2, - 5), m = -2/3
January 16, 2012

math
Where p and q are statements, "p and q" is false if p is false. Always Sometimes Never
January 16, 2012

math
The width of the rectangle is half its length and the perimeter is 42m.caculate the area of the rectangle.find the width and length of perimeter and area.
January 12, 2012

trig
I need help finding derivatives and antiderivatives. Given: f(x),find f'(x) 1. f(x)-2x^6 2. f(x)= -3x +7 3. f(x)= 3x^2 - 5x 4.f(x)= 1/2x^2 - x + 4
January 12, 2012

Organic Chemistry
So for the actual calculation.. would i just go 0.95 g benzoic acid * (10mL/0.680 g)?
January 10, 2012

Organic Chemistry
An impure sample contains 0.95g of benzoic acid and 0.05 of salicylic acid. Solubilities in water of the two compounds are given in the following table. Solubility at 20 degrees (g/10mL) benzoic acid: 0.029 salicylic acid: 0.22 Solubility at 100 degrees (g/10mL) benzoic acid: ...
January 10, 2012

Fine Arts
Thank you. Its in that category for my class. Do you know where i could find the influences upon Jack Kirby and Joe Simon??
January 9, 2012

Fine Arts
I am doing a report on the original comic book Captain America. I need to know the author, publishing date, info that pertains to the comic. Does anyone know where i can find it?
January 9, 2012

physics
a hydraulic lift is designed for a gain of 100, so that a 10 N force applied at theinput piston will produce a force of 1,000 N at the output piston. If the radius of the input piston is 2 cm, the radius of the output is a) 200 cm, b) .02 cm c) 400 d) 20 e) .05
January 8, 2012

physics
a cube of side L is made of a substance that is 1/4 as dense as water. WHen placed in a calm water bath the cube will a) float with 1/2 L abovethe surface b)sink to the bottom, c) float with 1/4 L above the surface d) float with 1/4 L below the surface e) float with 3&...
January 8, 2012

Chemistry
If 0.273 moles of ferrous ammonium sulfate (Fe(NH4)2(SO4)2 . 6H2O) and an excess of all other reagents are used in a synthesis of K2[Fe(C2O4)3] . 3H2O, how many grams of product will be obtained if the reaction gives a 100% yield? Please help i found the molar mass of (Fe(NH4)...
January 7, 2012

Science
If .275 moles of ferrous ammonium sulfate (Fe(NH4)2(SO4)2. 6H2O) and an excess of all other reagents are used in a synthesis of K3[Fe(C2O4)3].3H2O, how many grams of product will be obtained if the reaction gives a 100% yield? Can someone help me solve this I found the molar ...
January 7, 2012

History
I have to write three major events or ideas from the book Tortilla Flat by John Steinbeck. I don't really know what could be considered as a major event. I know one can be that Danny died, falling into a ditch while he was drunk. Im not sure what else to write. Please help.
January 2, 2012

math
if the input is 24 what is the output? the table is: the input table: x,4,8,12,16 the output table is: y,1,2,3,4
January 2, 2012

math
If tan(xy) = x, then dy/dx =
December 30, 2011

world history
A strong, efficient government helped to unite Charlemagne's empire.
December 9, 2011

Science
Umm....... Do you mean, like, what I would do if I did the experiment again? What I would do to improve the experiment?
December 3, 2011

Science
For my science project, it says to write a "Future Research" section to go on the board. Could you just explain to me what exactly goes in that section? I'm so confused!
December 3, 2011

algebra
How do I graph the function f(x)+1/4x+4?
December 2, 2011

Need help
Studies have demonstrated that "latchkey children"
December 1, 2011

math
what is the area of a rectangle that is 3 yards wide by 8 yards long?
December 1, 2011

History
I need to list 3 problems of the colony that Stephen Fuller Austin founded. I have two of the three- -no food -bad indian relations I need one more!
November 30, 2011

Math
2x^2+8x=-5
November 27, 2011

chemistry
b) no reaction in the dark
November 22, 2011

chemistry
A) CH4 +Br2 sunlight-> CH3Br + Br
November 22, 2011

Science
So I'm in 7 grade and doing a science project. I have a question: What does it mean when it says: RESEARCH? I am required to have this on my board. Does it mean what I looked up to help me on this project? Also, what does it mean when it says: DATA? Do I just summarize ...
November 21, 2011

Chem
Rank thefollowing elements in order of decreasing atomic radius. N, B, Be, Li? I thought it was N, B, Be, Li
November 14, 2011

Math-Help please?
Michael owns 300 shares of a certain stock. Suppose the price of the stock drops by $4 per share. Write a multiplication equation to find the change in Michael's investment. I put 300x(300x[-4]) is that right?
November 14, 2011

algebra
welcome! :)
November 14, 2011

algebra
yeah you are right, the lines mean absolute value, which is the numbers distance form zero. -25's distance form zero is 25, so you would put 25.
November 14, 2011

algebra
the dimensions are 6m by 8m
November 14, 2011

math
for the polynomial shown below, find f(-1). f(x)=3x^4-x^3+4x-2
November 14, 2011

Math
Based on its degree, what kind of polynomial is this? h(x)=-x^2+2x-5
November 14, 2011

english
Please could you help me with 6 words with silent letters ...please
November 14, 2011

physics
a pet truck is moving at 25m/s north, a dog inside moves at 1.75 m/s at angle 35 degrees east of north. What is the velocity of the dog relative to the road?
November 13, 2011

Math
What is the volume of a sphere with a radius of 7 cm? Use 22/7 as pi.
November 13, 2011

chem
Suppose that the microwave radiation has a wavelength of 10.8cm . How many photons are required to heat 295ml of coffee from 25.0 C to 62.0 C? Assume that the coffee has the same density, 0.997g/ml , and specific heat capacity, 4.184J/(gk) , as water over this temperature range
November 11, 2011

english
why do u think Edwards felt it was necessary to terrify his puritan audience into action?
November 9, 2011

Math
A television station has 28 new TV shows scheduled to air this week. What fraction of the television shows, in simplest form, are 30-minuet programs?
November 8, 2011

chemistry
Calculate the molarity of the commercial bleach before it was diluted. bleach 6.25%
November 3, 2011

chemistry
Calculate the molarity of the commercial bleach before it was diluted. bleach 6.25%
November 3, 2011

physics
water at 20°C has viscosity n=1.0*10^-3 Ns/m^2. sand grains have density 2400kg/m^3. suppose a 1.1 mm diameter sand grain is dropped into a 51m deep lake whose water is a constant 20°C. If the sand grain reaches terminal speed almost instantly (a quite good ...
November 2, 2011

physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?
November 1, 2011

chemistry
and what is the theoretical yield?
October 29, 2011

chemistry
a student set up a reaction with 0.2905g of cholesterol and 0.13g of nonanoyl chloride in excess triethylamine, and collected 0.0244g of solid product. what is the actual yield (in grams) of cholesteryl nonanoate? explain how to do this please :)
October 29, 2011

calculus
thanks!
October 28, 2011

calculus
Find all values of 'a' such that y=a/(x−9) and y=x^2−18x+81 intersect at right angles. show steps please :)
October 28, 2011

MATH
A town decides to build a playground using one of the existing walls beside an elementary school. What is the maximum area they can enclose using only 100ft of donated fence?
October 28, 2011

physics
Suppose a 46-N sled is resting on packed snow. The coefficient of kinetic friction is 0.11. If a person weighing 625 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?
October 27, 2011

science
How does the Kinetic Theroy of Heat explan Solids, Liquids, and gasses?
October 24, 2011

science
What is the difference in Thermal Energy and Heat.
October 24, 2011

Phyisical science
How much energy is in a soccer ball that is moving at 3 m/s and has a mass of 2kg.
October 24, 2011

chemistry
A 48 g sample of water at 98.°C is poured into a 55 g sample of water at 15°C. What will be the final temperature of the mixture?
October 20, 2011

Please check drwls
1.C 2.d 3.A I don't know is it correct.
October 20, 2011

Chemistry
What would be the products of this chemical reaction?? Co(NO3)2 (aq) + NH3 (aq) = ?????? a precipitate is supposed to be formed.
October 18, 2011

chemistry
CH3OH(g) ----> CO(g) + 2H2 (g) (delta H =+90.7k) A) is heat absorbed or released in the course of this reaction? b) calculate the amount of heat transferred when 45.0g of CH3OH(g)is decomposed by this reaction at constant pressure. c) for a given sample of CH3OH, the ...
October 17, 2011

chemistry
72g
October 2, 2011

accounting
Describe the relationship of the financial statements used in the financial plan for 2010 for Patton-Fuller Community Hospital.
September 30, 2011

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
September 29, 2011

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
September 29, 2011

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
September 29, 2011

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
September 29, 2011

Science
a question regarding Universal Law Of Gravitation. If the clouds are 50 km. high , what is its proportional distance to a globe which is one foot in diameter ? Thank you :))
September 28, 2011

Economics
I'm trying to research for a paper about why we shouldn't have flat tax rate, and a reason that i'm seeing people putting online, is that a flat tax rate of say, 18% would decrease tax revenue? Can someone explain how? I don't understand how taxes work.
September 26, 2011

improving it without changing its overall meaning
Ever been assigned to work on a group project for class! Many students dread group projects: because one student typically does most of the work. Unfortunately for some, group work does not end when students leave school, many employers use teams to accomplish ongoing ...
September 26, 2011

science
A 4.3 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.43 m above the counter?
September 24, 2011

math
draw a diagram to show how to find the solution 2.6 / 0.4 explain what the quotient means
September 19, 2011

Math
Pedro says the next expression in the following pattern is n+17,n+18,n+15,n+16,n+13,n+14._____ . Explain his error and write the correct expression.
September 19, 2011

Politics
I'm writing a speech, and it's about the topic "Private sector investment is preferable to public sector investment for Human Space Exploration" I'm on the con side for this argument, and one of my reasons was that public sector will spur cooperation, ...
September 18, 2011

physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10^5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10^5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?
September 18, 2011

HELP!!!!!!!!!GEOMETRY!!!!
THANK YOU
September 15, 2011

HELP!!!!!!!!!GEOMETRY!!!!
WHAT IS THE PERIMETER OF A SQUARE WHOSE VERTICLES ARE A(-4,-3), B(-5,1), C(-1,2), AND D(0,-2)?
September 15, 2011

Computer Science
An advertising agency wants to send a letter to all of its clients announcing a new fee schedule. The clients' names are in several different lists (arrays). The company merges the various lists to form one array, but clients could be listed in the array more than once. ...
September 13, 2011

algebra
Ms. Sue, I apologize, but all I'm getting is answers, I need to know how to work them out myself as my teacher didn't make himself clear.
September 9, 2011

algebra
how do i simplify -10 - (-7n) + (-9n)
September 9, 2011

AP Biology
What is important for reproducing animals? i dont exactly understand the question, help!!
September 7, 2011

stats
women age 20-29 is 36ml staandard deviation 7ml. What is probability greater than 45ml and between 30 and 62 ml
August 27, 2011

algebra
3 (x-8)
August 26, 2011

algebra 1
What is the "quotient" of 19 and m?
August 22, 2011

Math
Solve for a: a^-1 + b^-1 = 1
August 15, 2011

Math
Thank you so much! What I did wrong was pluck in the wrong equation
August 14, 2011

Math
A line has a slope of m = -1/3 and passes through the points (-4,k) and (2,3). Fine the value of k
August 14, 2011

Math
Solve for x: 6/x + 8/9 = 10/3x
August 9, 2011

calculus
(a) Modifying the parametric equations of a unit circle, find parametric equations for the ellipse: x^2/a^2 + y^2/b^2 = 1 (b) Eliminate the parameter to find a Cartesian equation of the curve x=2sint; y=4+cost; t >(or equal to) 0
August 8, 2011

Precalc(attn Bobpursley)
Hi i posted this before but I wanted to ask Bobpursley a few questions on his reply 1)For the first function you used cosine when they ask for sin, why is that? Also why did you put .5 in the beginning and end of the function? 2)For the second question why did you put 10 in ...
August 5, 2011

Precalc
okay sorry last two questions! I promise! The sun always illuminates half of the moon’s surface, except during a lunar eclipse. The illuminated portion of the moon visible from Earth varies as it revolves around Earth resulting in the phases of the moon. The period from a...
August 5, 2011

Precalc
of course! thanks!
August 5, 2011

Precalc
Okay for this question I know I am supposed to use the law of sines. But how can i tell what side is what? In right triangle ABC, a = 120 and c = 140, and ÐC is the right angle. Solve the triangle. Round to the nearest tenth, if necessary.
August 5, 2011

Precalc
oh I see thank you very much I totally get it now
August 5, 2011

Precalc
How do you know to use cos and not sine?
August 5, 2011

Precalc
oops sorry never mind
August 5, 2011

Precalc
where did the 12 come from?
August 5, 2011

Precalc
I am having trouble figuring out this question Jan observes a buoy bobbing up and down through a total amplitude of 8 feet. Beginning at the top of the wave, if the buoy completes a full cycle every 8 seconds, what is the height of the buoy relative to its lowest point after ...
August 5, 2011

math
Thanks hon!
August 4, 2011

math
(f-g) (fx)=1/x+2 g(x)= 3x I got -3x^2-6x+1/x+2 is this correct?
August 4, 2011

Precalc
Hello I need help with this question. I know that the formula for angular velocity is w= theta/time. I also know that the answer is 750 rpm. I am just not sure how to get that answer A truck driver travels at 58 miles per hour. The truck tires have a diameter of 26 inches. ...
August 2, 2011

calculus
The integral of sinx is from 2pi to infinity
July 31, 2011

calculus
Recall that a function G(x) has the limit L as x tends to infinity, written lim(x->infinity)G(x) = L, if for any epsilon > 0, there exists M >0 so that if x > M, then |G(x) − L| < epsilon. This means that the limit of G(x) as x tends to infinity does not ...
July 31, 2011

integral
thanks
July 31, 2011

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