daniton

By the way you should be more careful on the question it is a little tricky. Any way you did great.

Can I ask what grade are you in?

By the way I have tried to prove Fermat s Last Theorem from Pythagorean theorem.I didn't finish it completely just need more taught just not use such complicated number theory ......

my idea is very simple

I try to find integers which satisfy Pythagorean theorem using general formula the prove that are not perfect square.

what do you say??

if we have a mixture of total n mole(say x mole a ,y mole b,z mole c).and x+y+z=n.from there we can find the mole fraction that means moles of each components in 1 mole mixture.then we can multiply each mole fraction with each molecular mass and add them up.and it is called equivalent molecular mass. so my question is does equivalent molecular mass means mass of 1 mole of that mixture with respect to its components???????

I don't know this whole thing but in High school I used equivalent mass to calculate Normality.There is also sth called number of equivalents.

Sorry I couldn't help but if you need sth like this or equivalent mass I used in solution chemistry I can help you.

When you try to find "sth only" for example A only you should subtract any intersection of any thing with A from A but those relation should be them and them only ,those intersection must have no intersection.

if in system of A,B,C

relations

AnC

AnB

AnBnC

AnC only = AnC - AnBnC

AnB only = AnB - AnBnC

AnBnC only = AnBnC

when you subtract all these from A you get :

A only = A - AnC - AnB + AnBnC

try it fresh with this.

Thanks a lot for your help!!!!

I use extremepapers too but I didn't find organized test papers.

Oh!! my bad correct it with (AnC)u(BnC)

don't you know about the distributive laws of sets.

for more see:

http://en.m.wikipedia.org/wiki/Algebra_of_sets

 

When the charges are not in net motion, i.e. no current, there's no field. It's not that there's a huge field and it cancels. There's no net field of the protons and electrons.

I think asad118 is trying to say moving electrons in metal atom assumed in the whole metal.

Why don't you just second derivative test.It's easy and quick.

you raise good example.You can see that you add AnBnC: d three times when you mix A,B,C than you subtract it three times on AnB,AnC,BnC which you can understand you removed AnBnC from the calculation at all. So, you have to bring it back by adding it specifically.

BTW you can proof it for general case just do this

AUBUC = (AUB)UC = AUB +C - (AuB)nC

 

(AuB)nC= (AnB)u(BnC)

=AnB+BnC-(AnBnBnC)

AnBnBnC=AnBnC

so

AUBUC=A+B+C- AnB - AnC- BnC+ AnBnC

I think you understand the sign change there.

Just give it some thought!!

You just need to figure out the individual forces when the electrostatic force cancels the gravitational force when they're 4cm apart. From there it's just F=ma and basic electrostatics.

Electrostatic force doesn't cancels the gravitational force(and it couldn't cancel ) the tension does.

For constant pressure and temperature yeah.

just use PV=nRT

V=kn simple right.

A Carnot engine operates between reservoirs at 20 and 200°C. If 10 kW of power is produced, the rejected heat rate is nearest

26.3 kJ/s

20.2 kJ/s

16.3 kJ/s

12.0 kJ/s

 

Above is full question please could help me

This forum is actually to help anyone despite there scientific knowledge and in this thread (homework help) we help, but we don't do.

 

In my previous post I try to show you how it is done. Just try it I'm sure you can get it.

If you follow it you should get 16.3

to the answer may be or approximately....

 

any way you find the efficiency and then the power delivered if it was 100% efficient in the end it's a matter of subtraction with the given power.

try this

Cos(z+y)=Cos(z)Cos(y)-Sin(z)Sin(y)

=>

z+y= Cos⁻¹ [Cos(z)Cos(y)-Sin(z)Sin(y)]

using this:

the expression becomes this by little rearranging

 

Cos⁻¹[(2/ √13 )*x - (3/ (√13)) *√(1 -x²)]

Cos(z)=?

Cos(y)=?

try the rest. I think that helps!

yeah that would be nice if you know physics too. I'm taking the exam in November. Do you have Facebook or twitter account? for more!

thanks in advance.

the one thing that bother me is that I couldn't find any revision guide.I'm taking maths and physics and one which I didn't decide for sure may be pure mathematics but I couldn't find any.

The reason why you have to add AnBnC is because you subtracted it two times not once one in AuB two in (AuB)uC since it is a part of both(try to imagine it in circle or something like that).So, you have to make correction so you did ,you add it.

in general :

AuBuC=A+B+C - AnB - BnC - AnC + AnBnC

 

Have you tried to put figures on this uncertainty at the scale of planets? Any reasonable person would qualify by "exact" a solution that would neglect this uncertainty.

I may not know well about those complicated things may be when I get in to astrophysics but i got this link which may add fuel to this hot discussion

http://www.sciencedaily.com/releases/2013/05/130529191041.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fmatter_energy%2Fphysics+%28ScienceDaily%3A+Matter+%26+Energy+News+--+Physics%29

BTW I really like the discussion!!!

you're absolutely correct.

you are asked (O U S)' == Universe - (O U S) which you answered!!!!

why are you expanding?

what are you trying to find?

I didn't understand any of what you did may be it's beyond me:-)

Any time!!!!!

What do you actually mean please?

 

I think he is saying why the hybrid is more stable than the resonance structure.

for example benzene's structure is intermediate between the other resonance structures and stable. but why?

I know the fact since high school but I didn't read any thing why delocalization stabilize it.

When I google it I found this link check it out... this might help.

http://academic.reed.edu/chemistry/roco/resonance/geometry.html

That is not necessary and depends on what you want to get , but if you want you can.The basic thing behind unit convention is that use SI units not be confused and more importantly agreement of units

And another thing kilo mole is not common to use its better just to change KPa into Pa.

Hey, do you need help for all 11 problems.

if so there is another basic problem.

Any way one question at a time choose the hardest.Read your text book, refer.......

you don't have to go that much.

you got Vt = (2gh)^.5

the t = Vt/g eventhough you are right through that whole process.