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March 30, 2017

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Posts by Catherine

Total # Posts: 431

Science
What are two competing effects that determine the size of the star? Please keep the answer short and thank you.
May 14, 2011

Physics
Just wanted to thank you for answering all my questions even though I was clearly lost during most of this process... I finally got it... Thanks =D
May 8, 2011

Physics
Sorry for reposting this but I'm still confused with the last part... You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
May 8, 2011

Physics
So is the period 8222 s? I still don't get why the ansser for the aphelion is wrong...
May 8, 2011

Physics
Sorry for reposting this but I'm still confused with the last part... You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
May 8, 2011

Physics
Sorry for reposting this but I'm still confused with the last part... You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
May 8, 2011

Physics
For a scene in a movie, a stunt driver drives a 1.50x10^3 kg SUV with a length of 4.35 m around a circular curve with a radius of curvature of 0.333 km. The vehicle is to be driven off the edge of a gully 10.0 m wide, and land on the other side 2.96 m below the initial side. ...
May 8, 2011

Physics
You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a technician, you find yourself...
May 8, 2011

Physic
A 3.8 kg object is supported by an aluminum wire of length 1.9 m and diameter 2.2 mm. How much will the wire stretch?
May 7, 2011

Physics Question
Here is a demonstration Pascal used to show the importance of a fluid's pressure on the fluid's depth : An oak barrel with a lid of area 0.17 m^2 is filled with water. Along, thin tube of cross-sectional area 4.7×10−5 m^2 is inserted into a hole at the ...
May 7, 2011

Physics
I'm sorry, I don't understand, you mean this equation: P = 2pi sqrt[R^3/(GM)] won't a be 12,345?
May 7, 2011

Physics
Thanks, I now get 5481 seconds for the period, then I have to multiply that by 1.5 right? I get 8222 s When you say substitute a for R, you meant for the equation of the aphelion?
May 7, 2011

Physics
I must be doing something wrong because I typed the answers for a second time and they are wrong, I have only one attempt left, can you please check what I did wrong? For the period what I did was P = sqrt(R^3(4pi^2)/GM) P = sqrt ((6720^3(4pi^2)/(6.674E-11(5.9742E24))) P = 0....
May 7, 2011

Physics
You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a technician, you find yourself...
May 7, 2011

Physics
I must be doing something wrong because I typed the answers for a second time and they are wrong, I have only one attempt left, can you please check what I did wrong? For the period what I did was P = sqrt(R^3(4pi^2)/GM) P = sqrt ((6720^3(4pi^2)/(6.674E-11(5.9742E24))) P = 0....
May 6, 2011

Physics
So will the aphelion be the perihelion + 2a = 31,410 km?? In order to calculate the period, won't I need the velocity?
May 6, 2011

Physics
I'm sorry, you are right, I omitted some words, here is the question: You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International ...
May 6, 2011

Physics
You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a technician, you find yourself...
May 6, 2011

Social Studies
Oh....... true. Thanks!!
May 4, 2011

Social Studies
Um..... I thought it was because he was the symbol of preventing wildfires, but I thought it had to be bigger than that. I know he is trying to promote stopping wildfires to save our ecosystem, but the popularity question confuses me. I mean, I pretty much know, but I can'...
May 4, 2011

Social Studies
Why has Smokey the Bear been popular for so long? What does he try to promote?
May 4, 2011

Physics
A beam, B1, of mass M1 = 0.6887 kg and length L1=1 m is pivoted about its lowest point at P1. A second beam, B2, of mass M2=0.200 kg and length L2=0.200m is suspended (pivoted) from B1 at a point P2, which is a horizontal distance d=0.550, from P1. To keep the system at ...
May 2, 2011

MGT 330
Extrinsically motivated
May 1, 2011

Physics (please help)
A planet is in circular orbit about a remote star, far from any other object in the universe. Which of the following statements is true? a. None of the other statements are true. b. There is only one force acting on the planet. c. There are two forces acting on the planet and ...
April 30, 2011

English-CHECK PLEASE
Ohh.............. Thanks! i get it!
April 15, 2011

English-CHECK PLEASE
Ok, I figured this out (I think) but can you please check? Don't worry. I can carry the tent all by myself because it is so light. I do not even need a lantern it is so light outside. In these sentences, the word "light" is used as a: A:homophone B:homonyme C:...
April 15, 2011

Calculus (urgent!!)
A particle moves with its position given by x=cos(2t) and y=sin(t), where positions are given in feet from the origin and time t is in seconds. A)Find the speed of the particle. Speed = ____________ (include units) B)Find the first positive time when the particle comes to a ...
April 15, 2011

Calculus (pleas help!!!)
Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization tracing ...
April 15, 2011

Calculus (please help!!!!)
Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization tracing ...
April 14, 2011

Calculus (urgent!!)
Ok..I found the problem with my first part, I accidentally typed cost(t)^2... Ok I'm still stucked with the last two parts, I don't know what to do with them....
April 14, 2011

Calculus (urgent!!)
A particle moves with its position given by x=cos(2t) and y=sin(t), where positions are given in feet from the origin and time t is in seconds. A)Find the speed of the particle. Speed = ____________ (include units) B)Find the first positive time when the particle comes to a ...
April 14, 2011

Calculus (please help!!!)
I typed 0 for the time, since it was at (0,1) when it started, and slected yes for part c, I have part A and B wrong, I don't know how to write the intervals from part A and I didn't see any counter-clockwise motion... please explain...
April 14, 2011

Calculus (please help!!!)
Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization tracing ...
April 14, 2011

Calculus
What I thought that I had to do was to take the derivative, (2/x)/2x and then plug in 2... and that's how I got 1/4, but that's not the answer, what do I have to do?
April 13, 2011

Calculus
I thought that it was 1/4 but that's now the answer....
April 13, 2011

Calculus
Find the limit: lim x-> 2 ln(x/2)/ (x^2−4) Can someone help me with this?
April 13, 2011

English
I just typed the passage. My assignment is to make a high level (8th grade) question for the passage. What do you mean by my analysis?
April 13, 2011

English
What are some high level questions about the moon? Please put at least 4. What are some high level questions for this passage? There was once a sheperd who loved his sheep but was growing tire of caring for them. One hot day, he sat down under a tree and pondered what to do ...
April 13, 2011

English
thanks!
April 7, 2011

English
What are the steps for editing?
April 7, 2011

Calculus (urgent!!)
Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if you are asked to ...
April 6, 2011

Calculus (pleas help!!!)
Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if you are asked to ...
April 5, 2011

Calculus (pleas help!!!)
Please answer the following questions about the function f(x)=e^(-0.5x^2) Instructions: If you are asked to find x- or y-values, enter either a number, a list of numbers separated by commas, or None if there aren't any solutions. Use interval notation if you are asked to ...
April 5, 2011

Calculus
Find the global maximum and minimum values of f(t)=4t/(2+t^2) if its domain is all real numbers?
April 5, 2011

Math
8.
March 21, 2011

Math-REALLY CONFUSED
On the worksheet it showed an example, and for a quadrilateral it showed only 1 diagonal, so it didn't do all the diagonals or it would be 2, so I did only the diagonals from one corner, which is 4. I just now divided 900 by 7,(using a calculator) and the answer was 128....
March 21, 2011

Math-REALLY CONFUSED
Thanks. Yeah I tried 900 divided by 7, but it kept going on and on and on and on and on. Unless I calculated wrong.
March 21, 2011

Math-REALLY CONFUSED
Ok, so this worksheet says that a regular heptagon has 7 sides. So, would it have 7 angles, 4 diagonals, 5 triangles, and that the angle sum of the figure is 900 degrees. Am I right on those? But then it says to find the "Measure of each angle". Wouldn't it would...
March 21, 2011

separation of variables
if dy/dx=-3y and y=1 when t=0, what is the value of t for which y=1/3?
March 19, 2011

separation of variables
find an equation of the curve that passes through the point (1,1) and whose slope at (x,y) is y^2/x^3
March 19, 2011

Calculus (pleas help!!!)
A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=2. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find the y-value for ...
March 16, 2011

Calculus Please Help
I see what is wrong with my equation... now I have (-2x+y^2)/(3y^2-x2y) and for the second part I tried to plug 1 for x and all the other values for y and then in the third part I plugged 2 for y and 0.96 for x and I got them all wrong: my values are: 0.96 = -1.2765 0.98= -1....
March 15, 2011

Calculus Please Help
In the first part... I got (-2x+y^2)/(3y^2+x2y) but apparently that's wrong which will make everything else wrong.... I just need to know how to do that part right...
March 15, 2011

Calculus Please Help
A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=2. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find the y-value for...
March 15, 2011

Calculus
But that's not the answer...
March 15, 2011

Calculus
I solved and I got: (9-lny)/(x((x/y)+6y^5))
March 15, 2011

Calculus
Find dy/dx in terms of x and y if xlny+y^6= (9)lnx
March 15, 2011

Calculus
Find dy/dx in terms of x and y if xlny+y^6= (9)lnx
March 15, 2011

Calculus
Oh never mind I got the answer... -6(cosw^5sinw+w^5sin(w^6)) just missing the ^5
March 9, 2011

Calculus
Find the derivative of y=cos^6w+cos(w^6) The answer I have is -6(cosw^5sinw+wsin(w^6)) but it's not right...
March 9, 2011

Calculus
But why is b -2?
March 9, 2011

Calculus
How did you get the -2 at the beginning?
March 9, 2011

Calculus
Find the derivative of (b/(a+z^2))^2 Assuming that a and b are constants...
March 9, 2011

Math-CHECK PLEASE
Thanks so much!! :D
March 8, 2011

Math-CHECK PLEASE
Which of the statements is ALWAYS TRUE? A-A right triangle is a scalene triangle. B-An equilateral triangle is an isosceles triangle. C-An isosceles triangle is an obtuse triangle. D-A right triangle is an acute triangle. I got either A or D. I don't know. Also, if angle A...
March 8, 2011

3rd grade mathath
I think that you have to move 10 degrees, but I am not sure.
March 8, 2011

math HELP!!
If 4/8 is meant to simplify to 1/2, so yes, they are all simplified. If 4/8 and 1/2 are separate, then no, because 4/8 simplifies to 1/2.
March 8, 2011

Math
Oh. ok. thanks.
March 7, 2011

Math
A trapezoid has to have one pair of parallel lines, right? If a shape isn't a trapezoid because it has no parallel lines, no equal sides, but has four sides, what is it? The question wanted the best descriptive name.
March 7, 2011

6th grade math
The height is 8 meters, because L times W times H equals volume, and 12 times 6 equals 72, and 576 divided by 72 is 8.
March 7, 2011

Writing-Please Help! :(
I guess. Hm. Life.... wife....... stife.......... pife.... gife...... rife.........
March 7, 2011

Writing-Please Help! :(
But this is a letter to my mom... it's supposed to thank her for all the things she's done.
March 7, 2011

Writing-Please Help! :(
Um........ Not really, because I want words that are sentimental-ish.
March 7, 2011

Writing-Please Help! :(
I couldn't find anything.
March 7, 2011

Writing-Please Help! :(
What is a word that ryhmes with life, but goes with the words: love and life?
March 7, 2011

fact and opinons
I think that it is an opinion, because if you ask around, some people may not say so.
March 7, 2011

Social Studies
THANK YOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! SO FREAKING MUCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
March 5, 2011

Social Studies
What are some things that start with or have x and y in them that can be found in Sudan? I've looked EVERYWHERE. Except Sudan literally.
March 5, 2011

Social Studies-URGENT
Thanks.
March 4, 2011

Social Studies-URGENT
I'm doing a project for social studies, and I want to know if the African Queen Lily grows in Sudan. Please help!
March 4, 2011

Math-HELP PLEASE
Anita says that the plus sign + forms 2 pairs of verticle angles. Charles says it forms two pairs of congruent angles. Who is correct?
March 1, 2011

Math
If something is $99.99, and it is 55% off, would the price be $44.99 or $45.00? If something is $67.99, and it is 25% off, would the percent off be $16.99 or $17.00?
February 28, 2011

Math
ya........ i put the wrong thing.
February 28, 2011

Math
oops...... wrong question.
February 28, 2011

Math
Can you just help me? So, if something is $99.99, and it is 55% off, would the price be $44.99 or $45.00? And of something is $67.99, and is 25% off, would the price be $16.99 or $17.00?
February 28, 2011

Chemistry
What is the product of the following reaction: Mn(s) + Cu(NO3)2 -> I just want to make sure if it's Mn+2 + Cu(s) or if there's no reaction...
February 25, 2011

Geometry
Thanks though.
February 24, 2011

Geometry
Hmph.
February 24, 2011

Geometry
Are perpendicular lines the same as intersecting lines?
February 24, 2011

Science
a moluclue is two or more atoms put together, or the smallest particle of a compound that has all the chemical properties of that compound.
February 24, 2011

Chemistry
The indicator Methyl Yellow changes from red to yellow over the pH range of 2.9-4.0. A second indicator, Bromcresol Purple., changes from yellow tored over the pH range of 5.4 - 6.8. You conduct an experiment in which a sample of HCl is titrated with NaOh, and HCl is the ...
February 24, 2011

Science
Yeah my teacher just wanted a model, representing the Earth. She said you could do it on paper, edible. I did what you said, and since this is due tomorrow, I was freaking out.
February 21, 2011

Science
Ok, so I'm doing a project on the Earth's layers, and I just have a question on the model. DOES IT HAVE TO BE 3-D? If it is, I'm dead meat.
February 21, 2011

Art
Hi- I have to do an Art analysis on 'Diamond Dust Shoes' by Andy Warhol, and am a bit stuck on the part "what do you think the artist was trying to say?" I am in yr 8, and was wondering if anyone had any suggestions :) Thank you!
February 21, 2011

physics
A string is tightly stretched between the point A-G at point C it's lightly pinch and point B it's plucked, at points DEF are light folded tissue paper the segments A to BB to CC to DD to E and EG are all equal in length, what happen to the tissue paper does it fall or...
February 21, 2011

Physics (please help!!!!)
It's ok I got it, it's 243 N...
February 18, 2011

Physics (please help!!!!)
A suitcase of weight mg = 450 is being pulled by a small strap across a level floor. The coefficient of kinetic friction between the suitcase and the floor =0.640 a) Find the optimal angle of the strap above the horizontal. (The optimal angle minimizes the force necessary to ...
February 18, 2011

I really really need help with this problem ASAP! please
Please
February 18, 2011

Physics (please help!!)
Oh my answer is right... can someone tell me how to calculate the minimum tension in the strap needed to pull the suitcase at constant speed? My answer for the tension is 534N and I know it's wrong...
February 18, 2011

Physics (please help!!!!)
My answer is 32.6...is that right? If not please tell me how you did it...
February 18, 2011

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