Recent content by g2c

Thanks, It states the formula nut doesn't tell why this is so

@Lnewqban - exactly! Can you please detail the fondement of this result? Or send a link to literature dealing with such kind of forces problems? Below a picture of the worksite 1- fulcrums 2- long rod 3- short rod 4- clamps for adjusting the short rod length so as to have short + long = a bit...

@berkeman - I used intuitively this setup to repair a broken pvc pipe and it did generate a large enough horizontal force but i don't know how to derive the formula. I "guess" though it could be fh=fv*tg(alpha). I dont know what is fdb and how to build it. Do you mean a drawing?

Hello, id appreciate your help for the following case: in a room, a zero weight rod has zero friction bearings at its extremities. One of his ends lies on the floor, the other is against a wall, forming with it an angle alpha. A verical force fv is applied to the 'wall end'. How to calculate the...

I think I understood: The unite in the result of the division is the mol and so everything makes sens

@Mister T yes, I consider one H2 molecule as elementary particle and want to know what's its amount of substance according to the definition. What's wrong?? and if it is wrong, what is it , according to you, that is allowed to be taken as elementary particle?

My substance is 1 H2 molecule. According to Wikipedia "the number of discrete atomic-scale particles in it divided by the Avogadro constant" it would have an amount of substance of 1/NA since my sample has 1 particle (not one mole but one particle). How can it be??

According to Wikipedia, its (quoting) the number of discrete atomic-scale particles in it divided by the Avogadro constant So a molecule of hydrogen would have an amount of substance of 2/NA and would have a mass of 2/(6*10^23) daltons?