Sunday
April 20, 2014

Posts by lena


Total # Posts: 991

Physics
Why does frequancy stay the same when going through different mediums?

Physics
Is this statement correct: When part of sound travelled through water, wavelength and speed of sound would change because since the particles are closer together in water than in air, the speed of sound would increase which in turn would decrease the wavelength according to th...

Physics
I did a lab in which we were to find the 1st resonance and 2nd resonance and from them we found wavelength which in turn helped us find speed of sound. We used tuning forks and the frequancy was given. We besically moved a plastic tube which was in water up along with he tunin...

Identify the substance
There was a substance I used in a lab for chem class and I`m not too sure what it was. They were tiny white balls about a millimeter in diameter. What would they be?

Chem
Colloidal sulfur Would it be network, molecular, ionic or atomic?

Chem
OK, thanks so much :) I`ll remember the spelling.

Chem
drwls said that sugar is atomic however aren`t atomic substances supposed to be insoluable?

Chem
We were told to attempt to bend the substance which made absolutely no sense it me. So would you say that without the Brinell hardness test you can't exactly figure out the hardness of sugar?

Chem
drwls had said that sugar is molecular and I have this chart where it says that moleuclar substances are usually soft. So would you say that sugar is soft? My teacher said that hardness is more like if you can bend the substance and I find that a bit confusing.

Chem
I have another question. How would someone check the hardness of sugar? That was one of the objectives in the lab. Would you say that sugar is hard?

Chem
Thanks :)

Chem
Is sugar an ionic, a molecular or a network convalent substance?

Chem
Thanks so much :)

Chem
I only did 3 tests. Hardness, conductivity, melting point. Supposedly we are supposed to be able to figure out what type of substance it is from those three tests but I'm still uncertain.

Chem
I have to figure out whether the substance is ionic, covalent, molecular or atomic and all I know is that it is insoluable in water, that it is white and flaky, it has no electrical conductivity in water and it's brittle. I don't know how to go about figuring out what ...

Chem
Apparently it smells really bad when you burn it. I don't know if that helps.

Chem
There was this substance we used in a lab and I'm not quite sure what it is. It was a clearish, flaky, solid. It was brittle and insoluable in water. Does anyone know what it could be?

Physics
Thank you :)

Physics
The question said find the speed of sound at a certain temperature. What formula would you use? Could someone tell me the formula so I could do the questions that correspond.

math
because 5.5 is larger than 5.25? what does that have to do with the question?

math
The question is as followed: Express (rootP + 2 x rootQ)(rootQ - rootP) This is what I did: (rootP + 2 x rootQ)(rootQ - rootP) = rootPQ - p + 2q - 2 x rootPQ = - rootPQ - p + 2q Did I do this right and is this what the question was asking?

Find the minimum/maximum
oh ok thanks so much :)

Find the minimum/maximum
The question is as followed: y=-3x^2 + 4x This is how I solved it: y=-3x^2 + 4x y= -3 (x^2 + 4/3x) y= -3(x^2+4/3x +4/9) + 4/3 y= -3 (x+2/3)^2 + 4/3 The answer sheet said that x = 2/3 but wouldn't it equal -2/3 because there is a -3 before the bracket?

Myths
What would the theme be for it?

Myths
I`m trying to find the theme of an egyptain myth called The Story of Re or the Egyptain Creation myth and I'm the hardest time finding the theme for it. Could someone please help? (it's on egyptainmyths(dot)net)

myths
what are the comman themes in all egyptain myths?

actuarial science
Thank you so much :)

actuarial science
To get into an actuarial science program I was wondering was sort of high school courses I would need to take and what kind of marks I'd need to acheive. I`ve tried googling this but I can't seem to find information on this anywhere :S

Physics
The experimental values I have are: f=12 object location = 2.5f object distance from lens = 35 cm image distance from lens = 27 cm

Physics
I was asked to compare my measured focal length to my calculated focal length. My calculated focal length I figured out by using the formula: 1/di + 1/do = 1/f Would my measured focal length = my di? I only measured by di and do in the actual experiment.

Calculations
Thanks so much :)

Calculations
Like one of my questions asks compare your measured focal length to your calculated focal length. So would my di = my focal length in the experiment?

Calculations
is my di equal to my focal length?

Calculations
i`m being asked to find the focal length. I know that the distance from the lens to the object is 35 cm and that the distance from the image to the lens is 27 cm. I did the following: 1/27 + 1/35 = 1/f 62/945=1/f 15 15/62 = f Did I do this correctly?

Simple
Oooh, ok. Thanks :)

Simple
is the image that a magnifying glass produces real or virtual and how do you figure that out?

factoring
Thanks :)

factoring
How would I factor this: x^2 - 3x - 1

simple math
Thank you :)

simple math
how would I simply this: (y-2)/(2-y)

simple math
Thanks so much :)

simple math
How would I figure this out: 4^t = 8^t-1 Just by looking at it, I know that x = 3 but how would I figure this out mathematically?

simple math
Thank you :)

simple math
Like there are rules for multipling eponents with the same base, I was wondering if there were rules for addition. If I were to get some complicated like: 3^-2/3 + 3^5/8 ... it would take a longer time to solve.

simple math
is there any trick I can use to solve the question below without expanding: 2^3 + 2^4

Chemistry
what is the difference between hydration and hydrogenation reactions?

Physics
How is Snell's law being used in real life application?

physics
I did a lab on refraction through water and my index of refraction was way off and I don't understand why? I did the experiment just as I was told but my results were still way off.

Physics
Thanks :)

Physics
We were doing a refraction lab where you passed a lazer beam through a water in a semi-circular dish. I was wondering why we used a semi-circular shape?

Physics
Thanks so much :)

Physics
and i`m trying to find n2 right?

Physics
what do you mean by both indexes of refection? I put a lazer beam through water.

Physics
How do I find index of refraction if I have the incident angle and refraction angle?

English
Does this line make sense: something good comes of everything

English
Thank you :)

English
What do people mean when they say love is blind?

English
So I would say she was the complement?

English
Like I want to say she completed the family. She was the _________. I need a word for the blank.

English
I need a word that fits this description: something that completes somthing else.

English
Thanks so much :)

English
So I can only use he and she and stuff.

English
The essay is supposed to be about yourself in the perspective of someone you know. Is that narrative?

English
Can I use past tense in third-person narrative? Like being the first child of her family, she had the burden of ...

English
ok, thanks so so much :)

English
So I can't you 'is' when i`m referring to myself. like she is my hero.

English
But i`m talking about her. She's supposed to be my main character. In thrid-person narrative I thought you could you I to describe the narrator.

English
I need to write a thrid- person narrative about someone. I wrote the beginning and I was wondering if this was good enough to be a paragraph? Saying that she is my hero would be an understatement. She is so much more than that; she is the definition of inspiration, ambition, b...

English
Thanks so much :)

English
If there were one thing that I’ve ever wanted to achieve in my life, it would be to become at least half the person she is. So I wrote this sentance but a lot of people say not to end with is. How can I rephrase it. Or is using is at the end of the sentance ok?

English
Thanks Nicole and Ms. Sue :)

English
would it kind of be a run on sentance?

English
I wanted to join these two sentances together. She was so much more than that. She was like a mother. Could I write it like this: She was so much more than that; she was like a mother. Does that make sense?

Biology
How is sex (gender) determined in mammals? I was thinking that if the male gave over an X chromosome that the baby would for sure be a male because males have XY and if the male gave over an X then baby would for sure be a female because all females ar XY. Am I right? And coul...

Chem
Thanks so much :)

Chem
Thanks so much :) Is there a special name for them?

Chem
What are those gases that are always bonded to eachother, like they always have the a 2 subscript in an equation?

CHEM
I don't understand how to find the formula of a hydrate. Here's one of the question. if you guide me through it I think I'll be able to do the rest of them. Thanks :) When 100g of ZnSO4xœH2O is heated, 43.86g of water is given off. Calculate the formula ...

Chem/Bio/Nutrition
Why is the experimental Cal/g value usually less than the Cal/g value calculated from the Information on the nutrition label?

Plants
Thankyou :)

Plants
Why is active transport necessay in the process of moving food molecules within a plant?

Canadian Law
Thanks :)

Canadian Law
Thanks :)

Canadian Law
I was asked the question, what are some principles of law that can be used in everyday life? I got the following: don't judge a book by it's cover innocent till proven guilty I can't think of anymore. Could someone help me please. I've tried google but it dosen...

Biology
What is the name of the type of bacteris that live in harsh environments? is the answer, archaebacteria?

Spanish Flu
Thanks :)

Spanish Flu
Any cures or anything that could help someone affected?

Biology/History
Where did the Spanish Flu start? Not geologically, but who or what did it start from? Since we called it an infulenza pandemic did it start from a bird? And once this flu was transmitted to a human how could another human catch the flu?

Ottoman
ok thanks Ms. Sue & Writeacher :)

Ottoman
So if you`re an Ottoman that would it be correct to say that you are a decendent of the founder Osman I?

Ottoman
What does it mean when someone says my grandfather was ottoman? Like what does it mean to be Ottomon?

Chem
OH Thanks so much :)

Chem
I had a question that said would butane sink to the floor or rise to the ceiling in air. I would say sink to the floor but I was googling this and several sites said it wouldn't completely sink and that it would float. Is this right? And if so how would I explain this? My ...

Chem, could someone cheak my work please.
Isn't the density the mass of butane/V ?

Chem, could someone cheak my work please.
I did this experiment where I filled a graduated cylinder with water. The I put a stopper on it and put it under water and removed the stopper. The with a modified lighter (that wouldn't release sparks) I added butane gas. I got the following results: mass of lighter = 15....

Air and Butane
Thanks

Air and Butane
If air was at STP and butane was released, would the butance sink or woulf ir rise to the ceiling? I know that the density of air at STP is 1.292g/L. How would I go about figuring this out?

math/chem
I need to find the mass of butane gas and I only know the following things (you cannot use the molar mass of butane): volume = 80 mL pressure = 98.23 KPa temp.= 298K So I found the number of mols and I got 0.003171814 mols. of butane. But I don't know what to do after this...

Could someone plese help. Its quite simple.
Thank you.

Chem
I did this experiment where I filled a graduated cylinder with water. The I put a stopper on it and put it under water and removed the stopper. The with a modified lighter (that wouldn't release sparks) I added butane gas. I got the following results: mass of lighter = 15....

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