# 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-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*