# Posts by lena

Total # Posts: 1,041

Physics
I dropped 3 different objects and they all had the same acceleration

Physics
It can be said that acceleration is not affected by the mass of the object however velocity is. If you increase the distance at which objects with the same mass are dropped, then velocity is increased. If you drop objects with different masses, the object with the greater mass...

Physics
thanks :)

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)

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)

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?

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.

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.

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?

Chem
What would have a lower boiling point: alkanes or alkynes? Why?

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.

Chem
Thank you :)

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?

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

The Word Hate
Thanks :)

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

Math
Thanks :D

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?

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?

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

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

chem
Thanks so much :)

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?

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

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

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

chem
OK, thanks DrBob :)

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.

chem
oh ok, thanks :)

chem
so chloroethane and HCL?

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

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

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

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?

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

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

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

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

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 ____________.

English
Thankyou :)

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

Hearing Aids ; Physics
Thanks :)

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.

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.

Sound Barrier
Thanks :)

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

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.

Resonance
What's a microwave waveguide filter?

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.

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?

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

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

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 ...

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 ...

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.

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