Sunday
December 4, 2016

# Posts by lena

Total # Posts: 1,039

Physics
thanks :)
April 5, 2009

Physics
I`m trying to find acceleration and I've been given distance and velocity. How would I find acceleration? (distance is distance from the ground; a ball was dropped from a certain height and that is what distance stands for)
April 5, 2009

Physics
I`m trying to find acceleration and I've been given distance and velocity. How would I find acceleration? (distance is distance from the ground; a ball was dropped from a certain height and that is what distance stands for)
April 5, 2009

Physics
So if I dropped the same ball twice at different heights suppose 1m and 500m the ball that was dropped at 500m would have a lower acceleratino but greater velocity?
April 2, 2009

Physics
Why is acceleration the same for all free-falling objects regardless of mass and distance? Please don't say according to this formula or something. could you please actually explain the theroy behind it.
April 2, 2009

Physics
How does mass effect a free falling object? I was thinking that if the mass is greater then object would have a higher acceleration because due to it's weight it would have less drag on it from the air. Something of that sort. Could someone else this to me please.
April 2, 2009

Physics
I dropped an object from a certain height and gravity was acting on it. What type of motion is that and how do I know this?
April 1, 2009

Chem
What would have a lower boiling point: alkanes or alkynes? Why?
March 27, 2009

Chemistry
I did a ester lab not too long ago I was wondering why we submerged the ester in cold water before we started to waft the smell towards us.
March 25, 2009

Chem
Thank you :)
March 25, 2009

Chem
I did an experiment for creating an ester. So basically I added an acid to an alcohol. We were to also add H2SO4 solution. Why did we add that?
March 25, 2009

The Word Hate
I never thought if it that way. That's certainly something to think about. Thanks a lot :)
March 24, 2009

The Word Hate
Thanks :)
March 24, 2009

The Word Hate
Let us assume that hate is the most strongest human emotion. Why is it so? (more of an opinion question)
March 24, 2009

Math
Thanks :D
March 23, 2009

Math
y = a(x - h)2(sqaured) + k Where would I put a number in order to stretch or compress the graph vertically in the equation above? And what does the a represent?
March 23, 2009

chem
how would I do the elimination reaction of 2-chloropentane. When I figured it out I got the products as being 1-pentene and hydrogen chloride. Is this correct?
March 13, 2009

chem
Thank you soo much :) and I`ll keep in mind what you said about fluroine.
March 13, 2009

chem
for the equation: propane + bromine how do I know on which carbon the Br would attatch itself to.
March 13, 2009

chem
Thanks so much :)
March 12, 2009

chem
Why is it C7H8? Dosen't every C in benzene, with the exception of the C attacthed to the methyl group, have 2 hydrogens attactches to it since C needs to make 4 bonds?
March 12, 2009

chem
How would I balance the equation then. I`ve tried several times but it's not working out.
March 12, 2009

chem
methyl benzene + oxygen is this just a combustion reactions so CO2 and H2O are produced?
March 12, 2009

Markovnikov's Rule
What if both carbon's have the same number of hydrogens, then which carbon gets "richer" in hydrogens?
March 12, 2009

chem
OK, thanks DrBob :)
March 12, 2009

chem
I have a question that say 2-butyne reacts with hydrogen and butane is the product. Wouldn't 2-butene be the product because there are only 2 hydrogens and therefore they can only break one bond not 2.
March 12, 2009

chem
oh ok, thanks :)
March 12, 2009

chem
so chloroethane and HCL?
March 12, 2009

chem
if I had ethane reacting with chlorine would the chlorine remove two hydrogens and form dicholorethane?
March 12, 2009

chem
Oh, I see it now. Thanks so much :)
March 12, 2009

chem
For methyl-2-butene how do I know what the methyl group is coming off of?
March 12, 2009

chem
yes that's where it would go then. Is the C making too many bonds because I count 5? Should I get rid of the hydrogen?
March 12, 2009

chem
CH3 - CH2 - CH (which has a Br and ethyl group off of it) - CH2 - CH3 - so basically the Br and CH2CH3 shift over to the CH
March 12, 2009

chem
.............Br .............| CH3 - CH2 - CH - CH2 -CH3 .............| ..........CH2CH3 This is what I meant to draw. The Br and ethyl group just shifted over after I clicked post answer. So would this be 3-bromo-3-ethylpentane
March 12, 2009

chem
I meant 3-bromo-3-ethylpentane The bromine and ethyl group are off the third (CH) not the first (CH3)
March 12, 2009

chem
Br | CH3 - CH2 - CH - CH - CH2 -CH3 | CH2CH3 How would I name the structure above? Would it be 3-bromo-3-methylpentane?
March 12, 2009

English
I need a word to describe children in the sense that they are pure. Pure as in they don't hate, they don't judge people based on colour or race. It has to be a very powerful word. My sentance was going something like: Children as a reflection of ____________.
March 12, 2009

English
Thankyou :)
March 11, 2009

English
I need a word for the following description: when children come into the world they`re vulnerable to like racism and sexist people and like all those things we are trying to prevent. What would you call those things (racism, sexism ect.)? One word
March 11, 2009

Hearing Aids ; Physics
Thanks :)
March 11, 2009

Hearing Aids ; Physics
I`ve looked at a lot of websites regarding how a hearing aid work but none of them told how the sound waves were involved in depth. Like what happens to the sound waves in the microphone, amplifier and speaker. Could someone explain this to me.
March 11, 2009

Hearing Aids
I`ve looked at a lot of websites regarding how a hearing aid work but none of them told how the sound waves were involved in depth. Like what happens to the sound waves in the microphone, amplifier and speaker. Could someone explain this to me.
March 10, 2009

Sound Barrier
Thanks :)
March 9, 2009

Sound Barrier
Could someone tell me what sound barrier is and what it means to break the sound barrier (in really simple terms)?
March 9, 2009

Geology
The dew point indicates the amount of moisture in the air. The higher the dew point, the higher the moisture content of the air at a given temperature. Conversely, the dew point of humid air will be higher than the dew point of dry air.
March 9, 2009

Resonance
What's a microwave waveguide filter?
March 9, 2009

Resonance
What is a real-life appliction of resonance in tubes? I've already written down musical intruments like the organ and flut and trumpet.
March 9, 2009

Science
It's as simple as that? My lab is on speed of sound in air. Does it have anything to do with speed of sound in air?
March 9, 2009

Science
How is it possible to have an instrument like a bugle that has a fixed-air column play a melody?
March 9, 2009

PHYSICS
How is it possible to have an instrument like a bugle that has a fixed-air column play a melody?
March 8, 2009

Physics
Why does frequancy stay the same when going through different mediums?
March 8, 2009

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 ...
March 8, 2009

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 ...
March 8, 2009

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?
March 2, 2009

Chem
Colloidal sulfur Would it be network, molecular, ionic or atomic?
March 2, 2009

Chem
OK, thanks so much :) I`ll remember the spelling.
March 1, 2009

Chem
drwls said that sugar is atomic however aren`t atomic substances supposed to be insoluable?
March 1, 2009

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?
March 1, 2009

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.
March 1, 2009

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?
March 1, 2009

Chem
Thanks :)
March 1, 2009

Chem
Is sugar an ionic, a molecular or a network convalent substance?
March 1, 2009

Chem
Thanks so much :)
March 1, 2009

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.
March 1, 2009

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 ...
March 1, 2009

Chem
Apparently it smells really bad when you burn it. I don't know if that helps.
March 1, 2009

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?
March 1, 2009

Physics
Thank you :)
February 25, 2009

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.
February 25, 2009

math
because 5.5 is larger than 5.25? what does that have to do with the question?
February 25, 2009

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?
February 25, 2009

Find the minimum/maximum
oh ok thanks so much :)
February 24, 2009

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?
February 24, 2009

Myths
What would the theme be for it?
February 22, 2009

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)
February 22, 2009

myths
what are the comman themes in all egyptain myths?
February 22, 2009

actuarial science
Thank you so much :)
February 19, 2009

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
February 19, 2009

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
February 18, 2009

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.
February 18, 2009

Calculations
Thanks so much :)
February 17, 2009

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?
February 17, 2009

Calculations
is my di equal to my focal length?
February 17, 2009

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?
February 17, 2009

Simple
Oooh, ok. Thanks :)
February 17, 2009

Simple
is the image that a magnifying glass produces real or virtual and how do you figure that out?
February 17, 2009

factoring
Thanks :)
February 16, 2009

factoring
How would I factor this: x^2 - 3x - 1
February 16, 2009

simple math
Thank you :)
February 16, 2009

simple math
how would I simply this: (y-2)/(2-y)
February 16, 2009

simple math
Thanks so much :)
February 16, 2009

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?
February 16, 2009

simple math
Thank you :)
February 14, 2009

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.
February 14, 2009

simple math
is there any trick I can use to solve the question below without expanding: 2^3 + 2^4
February 14, 2009

Chemistry
what is the difference between hydration and hydrogenation reactions?
February 12, 2009

Physics
How is Snell's law being used in real life application?
February 9, 2009

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.
February 8, 2009

Physics
Thanks :)
February 8, 2009

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?
February 8, 2009

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