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December 18, 2014

Posts by katie


Total # Posts: 1,715

College Physics
A point on a rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s^2. What is the angular speed of a point 0.075 m from the center of the disk?
June 8, 2010

Physics
A 3.0-m rod is pivoted about its left end. A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2m from the pivot causing a CCW torque, and a force of 5.2N is applied at the end of the rod 3.0m from the pivot. the 5.2N is at an angle of 30 degrees to the rod...
June 8, 2010

wgu
How did the moon landing help to change the way scientists understand an aspect of the natural world.
June 8, 2010

english 3
In olaudah equiano's "The Middle passage" what was his greatest fear when he boarded the ship
June 3, 2010

english 3
is fear an emotion
June 1, 2010

english 3
name two emotions Paine appeals to in his essay The Crisis
May 31, 2010

english
i have to write a declaration of independance what key words or [hrases should i use.
May 21, 2010

Calculus
Thank you! :)
May 18, 2010

Calculus
Differentiate: F(x)=e^(xsin2x) This isn't homework, it's review for our exam. Couldn't remember how to work it :( Thanks!
May 18, 2010

accounting
At the end of April, ABC company had a balance of $37,910 in vacations benefits payable account. During May, employers earned an additional $2,790 in vacation benefits, but some employee used vacation days amounting to $2,050 of vacation benefits.. The $2,050 was charged to ...
May 18, 2010

physics
Why can’t you take a photograph of your image in a plane mirror and focus the camera on both your image and on the mirror frame?
May 13, 2010

Physics
Please Help! In our everyday environment, diffraction is much more evident for sound waves than for light waves. Why is this true?
May 13, 2010

poetry
Can u please explain to me the poem On the wire by Robert service in detail?
May 6, 2010

math
what is 135/180 as a grade
April 30, 2010

Courts
Write a 1,100- to 1,400-word paper in APA format comparing the entertainment fiction of the court system with its reality. · Select examples from fictional portrayals of the courtroom found in books, movies, or television; for example, The Runaway Jury, A Few Good Men...
April 27, 2010

photo
What are the definitions to principals of design in photography?
April 23, 2010

Chemistry
2.91L
April 16, 2010

English
Write a sentence that matches the form provided in the description (Sentence with compound subject and action verb.) My Sentence is : The lizard and the cat jumped on the mouse. Now i need a second sentence to match my first sentence (Sentence with a proper noun and a linking ...
April 16, 2010

Math
the fatio is 12/38
April 13, 2010

Physics
A beam of mass mb = 10.0 kg, is suspended from the ceiling by a single rope. It has a mass of m2 = 40.0 kg attached at one end and an unknown mass m1 attached at the other. The beam has a length of L = 3 m, it is in static equilibrium, and it is horizontal, as shown in the ...
April 9, 2010

Physics
For B left side has m1 Right side has m2 picture looks like this ---------------------------------- I T= 637 I mb= 10kg I ------------------ ---------- <------x----------> I I I I I I m1 m2 ------------L=3m-------------
April 9, 2010

Physics
A beam of mass mb = 10.0 kg, is suspended from the ceiling by a single rope. It has a mass of m2 = 40.0 kg attached at one end and an unknown mass m1 attached at the other. The beam has a length of L = 3 m, it is in static equilibrium, and it is horizontal, as shown in the ...
April 9, 2010

math
A share of common stock has just paid a dividend of $2.00. If the expected long-run growth rate for this stock is 7%, and if investors require an 11% rate of return, what is the price of the stock?
April 7, 2010

5th grade
adVERB is for VERBS ajective is nouns
March 29, 2010

US
In 1938 Mexico nationalized America's oil, according to my textbook. What does this mean? I don't get what exactly they did.
March 29, 2010

Chem
I'm still not getting the correct answer: i have 2.00g/180.15g/mol =1.11*10^-2 1.11*10^-2/.6=1.85*10^-3 and (2.4_10^-3)^2/1.85*10^-3 = 3.11*10^-9. what am i doing wrong?
March 28, 2010

Chem
Aspirin (acetylsalicylic acid, ) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 L of water and measured the pH . What was the Ka value calculated by the student if the of the pH of the solution was 2.62? I...
March 28, 2010

chem
Thank you for your help! That website did clarify things a bit. Thanks again!
March 28, 2010

chem
classify each of the following as a lewis acid or base: Cl- BeCl2 B(CH3)3 P(Ch3)3 Cl- is an acid right? i'm not sure i understand this concept very well. :[ and i tried looking at my notes already.
March 28, 2010

College Chemistry
Given the following equilibrium constants, Ka (NH4^+)=5.6*10^-10 Kb (NO2^-)=2.2*10^-11 Kw=1.00*10^-14 determine the equilibrium constant for the reaction below at 25*C. NH4^+(aq)+NO2^-(aq)f HNO2(aq)+NH3(aq)
March 25, 2010

College Chemistry
pH=pKa + log(base/acid) 3.95=3.465 + log(base/acid) .494=log(base/acid) 10^.494 3.1
March 23, 2010

College Chemistry
Never mind, I figured it out.
March 23, 2010

College Chemistry
Calculate the ratio of NaF to HF required to create a buffer with pH=3.95. Also, can you please explain in a nutshell the whole concept of buffers? Thanks!
March 23, 2010

world issues
which countries give money or military support to Syria?
March 23, 2010

Chem
Consider this reaction: CO (g) + H2O (g0 <---> CO2(g)+H2(g) kc=102 at 500 K A reaction mixture initially contains 0.145 M of CO and 0.145 M of H20. What would be the equilibrium concentration of [CO]? I so far have kc= [H2][CO2]/[CO][H2O]= 102 I know i have to set up an ...
March 21, 2010

Algebra
Use a graphing calculator, it would be super easier dude.
March 19, 2010

Math
Find the vertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?
March 19, 2010

Math
Find th evertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?
March 19, 2010

Chemistry
sorry i did not mean to submit this question multiple times, my internet connection is low and i didn't think it went through. i apologize.
March 18, 2010

Chemistry
Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...
March 18, 2010

Chemistry
Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...
March 18, 2010

Chemistry
Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have to make modifications according to the stoichiometric coeffecients. So do I divide k1 by 2...
March 18, 2010

algebra
Evaluate whether a prepaid or monthly cell phone plan is most effective for a customer that uses x weekday minutes per month. I can make up my own numbers for each plan. Having problems making up the equations.
March 16, 2010

spanish
In Spain, all hotels are new and modern buildings? True or false.
March 15, 2010

College Math
Find the exact value of: sin [2sin^-1 (-sq rt (3)/2)] how do i answer this question? i don't know how to find the answer.
March 15, 2010

college math
The range can be found by plugging the values of the domain in the equation. For example, 3/(-3-6)=-1/3 -1/3 is part of the range because the range represents the outputs or y values that correspond to the inputs (the domain), or x values
March 15, 2010

Trig
How do I solve the following? sec 3 theta/2 = 2 on the interval 0<theta<2 pi? I tried to look in my textbook but it doesn't have an example. I also tried google and I was unsuccessful> How do I do this question? I know that the period for sec is 2 pi but I don'...
March 14, 2010

Chemistry
For a reversible reaction where A + B (both arrows) C + D, the equilibrium constant is represented by kc = 5.3 = (c)(d)/(A)[B]. Initially A and B are present at 2.00 M each. What is the final concentration of A once equilibrium is reached. I made an ICE table and came up with ...
March 11, 2010

Chemistry
thanks, i double checked and everything looks right. i'm going with answer d. thank you again!
March 11, 2010

Chemistry
2H2 (g) + O2 (g) <---> 2H2O (g) what is the likely magnitude of the equilibrium constant? a) k < 10 ^-3 b) 10^-3<K<10^3 c)k=0 d)k>10^3 i know that choice c is incorrect because if k=o there would be no need to calculate equilibrium, but how would i go about ...
March 11, 2010

College Chem II
Determine the [H3O+] of a 0.160M solution of benzoic acid.
March 7, 2010

College Chemistry
THANK YOU!
March 7, 2010

College Chemistry
Thanks for your help! I understand number 2, but I still don't get number 1. Is there any other way to explain it?
March 7, 2010

College Chemistry
What is the pH of the following solutions? 1)a solution that is 5.4×10−2 M in HClO4 and 3.0×10−2 M in HCl 2)a solution that is 1.80% HCl by mass (Assume a density of 1.01g/mL for the solution.) Please help! I am so confused!
March 7, 2010

CHEMISTRY
Is non-dairy creamer a colloidal dispersion
March 7, 2010

CHEMISTRY
Would non-dairy creamer also be a colloidal dispersion when placed in water?
March 7, 2010

CHEMISTRY
If a pinch of flour is placed in water, does it form a coarse suspension, colloidal dispersion, or true solution? What about pepper? I thought both would be a coarse suspension
March 7, 2010

CHEMISTRY
Would non-dairy creamer also be a colloidal dispersion if it is put in water?
March 6, 2010

CHEMISTRY
When powdered milk is added to water, is it a coarse suspension, true solution, or colliodal dispersion? What about baking soda in water?
March 6, 2010

physics
Water flows over Victoria Falls, which is 128 m high, at a rate of 1.4 x 106 kg/s. If half the potential energy of this water were converted into electric energy, how much electric power would be produced by these falls?
March 4, 2010

Math
Ok i got that too... it comes to a fraction but then when you check it in the equations you don't get the same answer.
February 28, 2010

Math
Solve the system of linear equations by elimination. Thank You for your help. 8x+10y=3 3x-5y=2
February 28, 2010

math
6 6 6 6 = 5 fill in the expressions to make this equation true
February 28, 2010

Calc
how do i begin to solve this? integral of (1/x^2)sec(1/x)tan91/x)dx I tried substituting tan(1/x) for u but i couldn't get it to work...
February 27, 2010

Calc
that is actually the answer (that my book gives) how did you get that??
February 27, 2010

Calc
How do i begin to solve this? integralof dx/(cube root of 3x+4)
February 27, 2010

Geometry
B (i think)
February 24, 2010

Physics
Two blocks are connected by a light string passing over a pulley. The inclined surfaces are frictionless, and the effects of the pulley can be ignored. The value of m1 = m2 = 1.0 kg and θ2 = 43.4 degrees. If the blocks accelerate to the right with acceleration a = 0.280 m...
February 23, 2010

math
1+1
February 23, 2010

physics
Small, slowly moving spherical particles experience a drag force given by Stokes’ law: where r is the radius of the particle, is its speed, and η is the coefficient of viscosity of the fluid medium. (a) Estimate the terminal speed of a spherical pollution particle of...
February 19, 2010

math
MIX W 5 CUPS CONCENTRATE AND 8 CUPS COLD WATER. SUPPOSE YOU MAKE ONLY 1 CUP OF MIX W. hOW MUCH WATER AND HOW MUCH CONCENTRATE DO YOU NEED?
February 16, 2010

english composition
i have a hard time understanding to write essay and start paragraph
February 13, 2010

college
how do you start with an essay with contrast and compare about your life now and five years ago ?
February 13, 2010

statistics
If ten households in this area are selected at random, what is the probability that exactly two of them will be in violation of this law?
February 11, 2010

Physics
If you can throw a ball vertically upward to a height h = 30.5 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed?
February 8, 2010

Physics
A rock thrown horizontally from the top of a radio tower lands 20.0 m from the base of the tower. If the speed at which the object was projected was 11.50 m/s, how high is the tower?
February 8, 2010

physics
A ball is thrown upward from a platform 4.6 m high with a speed of 23 m/s at an angle of 40 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
February 8, 2010

AP world history
Okay thanks, I'm writing a document based question and my teacher isn't very good at helping me with anything. I found the religions they gave me to work with so not helpful or relative to each other in anyway.
February 7, 2010

AP world history
Religions of common geographic origins tend to differ from others that originate in other areas of the world. How do religions having common geographic origins tend to share somewhat common codes of behavior and views or the nature and reason for existence?
February 7, 2010

chemistry
I put down that there are 98 protons, 3 neutrons
February 4, 2010

chemistry
State everything you know about the following atoms. Do NOT assume that they are balanced or neutral. Atomic number = 98 Mass number = 101
February 4, 2010

Physics-College
You have a 50V battery in a circuit with a single resistor R. If the resistor dissipates 200 J of energy in 5 seconds, what is its resistance?
February 4, 2010

College Physics
For the speed at which the ball was launched I got 18.12m/s. That part was right according to the computer. I didn't understand parts b or c of the question. For part a you multiplied vt by .608 instead of .6018 and that is why I got a different answer. Could you explain ...
February 1, 2010

College Physics
A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
February 1, 2010

college Physics
The coordinates of an object moving in the xy plane vary with time according to the following equations x = −7.16 sin ùt and y = 4.00 − 7.16 cos ùt, where ù is a constant, x and y are in meters, and t is in seconds. Write expressions for the ...
January 31, 2010

college Physics I
I have tried to put the numbers in the equation, but I am not getting the correct answer. Is there an easier way to explain it?
January 29, 2010

college Physics I
A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
January 29, 2010

college Physics
A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
January 29, 2010

math/probability
Assume that the weight loss for the first two months of a diet program has a uniform distribution over the interval 6 to 12 pounds. Find the probability that a person on this diet loses more than 11 pounds in the first two months.
January 24, 2010

Chem Apps
The solubility of sugar (surcose) in water is 4.0 g/mL at room temperature, what is the maximum amount of sugar that will dissolve in 850 mL of water?
January 21, 2010

Chemistry
The mass percent of a three component gas sample is 95.2% PF5, 1.40% C2H2 and 3.40% C3H6. Calculate the partial pressure (atm) of PF5 if the total pressure of the sample is 570.0 torr.
January 20, 2010

4th grade
I need to know I good way to do long division. The problem is: It takes 14 oranges to make a small pitcher of juice. Annette has 112 oranges. How many pitchers of juice can she make?
January 20, 2010

spanish
What does this mean: Cantas en el coro?
January 14, 2010

Statistics
I have to analyze a statistical research paper and have never done so. How do I analyze statistical data and where do I find sources to support my analysis?
January 14, 2010

Social studies
What word means to be the best in trade? None of my notes tell me this
January 13, 2010

Cultural Diversity
when looking for your community would you look up by the town in which you live in
January 12, 2010

Math
A square is inscribed in a circle of radius r. Express the length of the side of the square in terms of r.
January 11, 2010

Calculus
The function f is continuous on the closed interval [1,7] and has values in the table below x f(x) 1 10 4 30 6 40 7 20 Usinf the subintervals [1,4] [4,6] [6,7] what is the trapezoidal apporx. of the integral from 1 to 7 of f(x)dx? The answer: 160 I tried doing each interval as...
January 11, 2010

Calculus
Alright, I found -1/4cos(x)^4 but I didn't get the right answer. Did I dint the wrong anti-derivative? Do I have to do reverse chain rule and get... (-1/4cos(x))sin(x)^4?
January 11, 2010

Calculus
Let F(x) be an antiderivative of sin^3(x). If F(1)=0 then F(8)=? The answer: 0.632 How do I get to that answer? Do I find the antiderivatie and solve for F(x) when x=8?
January 11, 2010

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