Liquid Nitrogen and Dry Ice
Hi I am doing an experiment for my chemistry independent project which is on doing super conductors, well i am doing one wherre you take YBa2Cu3O7 - the so-called "1-2-3" superconductor and put it in liquid nitrogen and it makes a rare Earth magnet levitate above it...
Hi about 72 hours ago i had a computer problem. From a site i normally always go to lots of people go and never have a problem, its this american idol forum, and well on the forum they say u can download previous episodes of the show to watch again. Me being stupid decided to do this as so many...
I know it is in Uk and when I've tried to trace i got to london but then timed out and apparently it is from aol uk, so is there no way to get to the actual town or no? Thanks for the help by the way.
Hey i was wondering if someone could tell me the exact location of the computer from the ip address 195.93.21.33 . There is a person on this forum saying they are a famous person and we are unable to accurately check because of inaccurate tracer programs, so if anyone could trace that for me it...
Hi I am having problem with this question and keep getting the wrong answer.
1. A racecar driver must average 200km/h for four laps to qualify for a race. Because of engine trouble, the car averages only 170km/h over the first two laps. What average speed must be maintained for the last two...
Hi i am just starting a Data Managment project, grade 12 course, and we have to create a hypothesis and collect data from sources, and the analyze it. I was wondering if anyone had any topic ideas that shared a relationship. I am interested in doing something environment oriented like global...
Hi this site i regularly go to just got hacked and after or while it was when you tried to go to the site you would get the message :
"Simiens Crew 2004/2005 po um Mundo Melhor, Enquanto Houver Fome Guerra Morte Simiens Existira, Greetz Delphiboy pitt3r s8ldier "
Does anyone know what this...
Hi i am teaching my grade 12 biology class in a couple weeks cellular respiration, mostly focusing on the four stages. I was wondering if anyone knew a good site that had good quality and not hard to understand short videos clips showing certain steps or stages. I have found a couple but am...
Ya some of it is confusing as i don't know how to use that tex thing. For question d) the root is over x+1. And for question e) the equation is the second one you posted which as you said my answer is correct. f) is the equation you said so then i did what you said and this is the answer i get...
Hi i was wondering if someone could check my work for these couple questions:
Find dy/dx (do not simplify)
a)y=e^sin3x
dy/dx= e^sin3x (cos3x)(3)
=3cos3xe^sin3x
b)y=5^(square rootx) x^2
dy/dx=x5^(square rootx) (xln5+2)
c)y=ln(x^2 / (2x+5)^3 )
y=lnx^2 - ln(2x+5)^3
dy/dx= 2x/x^2 -...
Hi i was wondering if somone could check to see if i did this question correctly.
The question is: For the function y=3x^2 -1/x^3
a)Determine the x-intercept(s) and y-intercept(s)
b)Determine any asymptotes
c)Find the intervals of increase and decrease
d)Final all maximums and minimums...
Count Von Roo invited 141 monsters to his castle for a Halloween costume party, and all of the guests were either Yurbles (2 feeted monsters) or Rukis (4 feeted monsters). Because he had recently polished the floors, he provided socks for each of the guests so that they wouldn't scuff the...
Hi for biology we had to do a lab which we separated the plant pigments by chromatography of spinach. We used a solvent of 90% petroleum ether:10% acetone. After we did the experiment we ran out of time in class so the teacher went and recorded everyones results on there paper. The problem with...
I think the same way as you do, i see no point in having to have them since we are suppose to be writing essays of our origonal ideas but my english teacher wants us to find essays by people in university, or schloars of whom we agree with upon an idea of the literature so we can quote them. I...
Hi i am currently about to write a literary essay on the novel The Stone Angel by Margaret Laurence. For my English class we have to research essays written by others, namely proffesors or people with degrees, which we have same agreements to quote. I am having a problem in finding essays on the...
Hi i am having trouble with a couple questions involving percentiles, here is the question:
1) Adrian's average bowling score is 174, with a standard deviation of 35.
a) In what percent of games does Adrian score less than 200 points? More than 200 points?
b) The top 10% of bowlers in...
Oh my god, thank you, i completely understand know. I had sort of done what you had but instead did not factor and so it just kept getting more complicated and confusing me. Thank you so much.
Hi, i am having a little trouble with a couple of math questions, i thought i was doing them right but cannot get the answer. Ok the questions are:
(p^2q+ pq^3)^3 / p^3q^4
Now I do not know what to do, the answer i was told is suppose to be:
(p+q^2)^3 / q
I just don't know how to get...
Ok So i finished my questions and was wondering if someone could check my work to see if i did it right.
Question: If CosA= 1/3, with 0<A<pie/2, and SinB=1/4, with pie/2<B<pie, Calculate sin(A+B)
My Solution:
Sin(A+B)= SinACosB + CosASinB
=SinACosB + (1/3)(1/4)
SinACosB + 1/12
Ok Now...
Ok the last question on those pages of question is this and i have got stuck and can't figure it out. I need to show that (ds=degrees)
Sin(45ds+x) +cos(45ds+x) = sqaureroot2 cosx.
Ok so i did left side first and changed it to.
Sin45Cosy + Cos45Siny +Cos45Cosy - Sin45Siny
Now what i want to...
Ya ok i see what i did wrong ,i like to use sin and find myself always using it and i should have went to cousine, i figured out to factor it once you helped me get to that step so thank you so much. I only have 7 more practise questions on this sheet and only 2 have stumped me so i am very...
Ok now this question i got wrong too but i got 2 of the answers correct. ok question is solve for x the following equation.
2sin squared x= 1-cosx
Ok this is what i did.
2sin Squared x- sinx= 0
Let u= sinx
2uSquared - u=0
u(2u-1)=0
u=0, u=one half.
sinx=0, sinx=1/2
Now x= o and 2pie...
My friend sent me some Trigonometric proving identity questions to practise and i am usually good at them but i haven't done them for a while so i have gotten a bit rusty plus these ones to me are very difficult so i would like some assistance.
Prove 1/1+sin + 1/1-sinx = 2secsquaredx.
ok so...
Ok I have hit a little bumb in the road on my trigonometric function learning. Ok i need to graph the function y=3cos2(x-120degrees)-3, for x is less than or equal to 360degrees but is greater than or equal to -360degrees. Ok so i know the:
verticle translation is 3 down
the phase shift is...
Oh ok you i had tried and checked if it would worked befour and got an answer of 1 but thought i might had put a calculator error. Ok so i just had the sign wrong. Thanks for the help as that makes more sence. So than if the time was 15 seconds using the formula you would get approximently 6.858...
Oh well the problem is i don't know what i have done wrong so that is where i get stuck, i wasnt sure if it looked right and this is one thing i am not very good at so any help would be appricated.
Ok I have two questions both i have done but not 100% sure I have done them correct. I am good with math but not so well at Trigonemetric stuff. Ok here it is.
1) Convert the following angles to radian measure, leave in simpilest rational form. 350 degrees.
Ok what i have done is this...
Well I read at this site http://www.longevitywatch.com/bloodtype.htm [Broken] and it says that the different blood types is because of where the decandants came from and did, and how it is so many blood type O.
"The major difference between Blood types O and A is that Os have high...
Hi i had a question wondering ok i have heard and read that most people are blood type O. Well since O is a recessive gene how is it that there are so many O types when the other ones should be dominating. I just don't understand it?
Ya there is a good chance because the teacher when we ran out had to go into the back and make some more which i thought was weird since we were told we were using vinegar. I know it isn't really strong and either is the base as i sort of spilt some of the acedic acid on my hand and it did...
I don't think so, what we did for the experiment is take a beaker with 25 mL of vinegar (CH3COOH) and add a few drops of phenophalen, then slowly add drop by drop Sodium Hydroxide until the solution turns slightly pink and stays for 30 seconds. That is when we knew we were done. That is all we...
Ok what I am asking is do you calculate the mass of the vinegar by rearranging the density formula like so:
mass= density x volume
mass= 1.01g/mL x 25mL
mass= 25.25g
Would that be right for calculating the mass of vinegar?
And then the second part asks to find the percent by mass of...
I have another question similar to the last one. Ok The question tells me that the density of vinegar is 1.01g/mL and to calculate the mass of the vinegar sample, and the find the percent by mass of acetic acid in the simple. Now I know density= mass/ volume, and they give me the mass, the...
Oh really the question said find the molar mass of acetic acid. Then calculate the mass of acid in the volume of vinegar. I thought that the molar mass of acetic acid was 0.948g, but the molar mass is just the 60grams. Ok Thank You so much.