Recent content by Nader AbdlGhani

Thanks for your reply, but can you tell me how we are able to calculate for instance the voltage of a point charge having a charge Q, it's coordinates are (X,Y) while setting our reference point as infinity ?

Ok then, I can't get over that "convenient convention", and please tell me, what makes it legit ?

I'm facing a problem in my physics course which is accepting that infinity can be a reference point in both Electrostatics (calculating the voltage of a point) and Matter Properties (calculating the gravitational potential energy), how come we use a reference point which we don't know where it...

Actually I intended to ask generally, but then I went for the example spontaneously, I have just studied units and dimensions and they told me that constants don't have dimensions and units, for example, number one itself, angle of measure 60° etc, and what came in my mind are constants which...

Despite being a constant, It has both dimensions and a unit, can someone kindly explain why ?

What's the difference between f(x)=3 and f(x)=3x^0 ? and why Limit of the second function when x\rightarrow0 exists ? and is the second function continuous at x=0 ?

Well , thanks but that's so confusing ...

So the last answer is ? and can I know what is your educational background ?

That's what has come in my mind during the exam , and I wrote 0 hydrogen moles , but when I saw the ministry of education's official model answer they wrote 1 mole for acetone and 6 moles for diphenyl , and won't it (acetone) form secondary alcohol when it reacts with hydrogen ?

Are ketones saturated ? for example , Acetone ( CH3COCH3 ) my question is aroused by a question in the General Secondary Education Certificate Chemistry exam here in Egypt , as the question there was : How many moles of hydrogen molecules are required to react with one mole of : 1) Acetone. 2)...

If ##\mathbf{AB \leftrightarrow A^+ + B^-}## then ##\mathbf{K_d=\frac{[A^+][B^-]}{[AB]}}## then ##\mathbf{K_d=\frac{α^2C}{1-α}}## , and ##\mathbf{1-α\approx1}## therefore ##\mathbf{α=\sqrt{\frac{K_d}{C}}}## where C (concentration) is measured in Mol/litre and ##K_d## is unit-less .

Nope .

Thanks , The problem is with the distance not the displacement .

Homework Statement The displacement vector of a particle of mass 50 gm. is given as a function in time (t) by the relation ##\vec S##=(5t-t2) ##\hat c## where ##\hat c## is a constant unit vector , s is measured in centimetre and t in second .Knowing that the particle started its motion at t=0...

I'm sorry but what formula you want me to write ? and what do you mean the formula for alpha looks odd ? thanks .