Pjotr said:
Indeed it should be lower case, thanks
There are too many variables and not enough letters (romantic languages plus Greek). Early on, Maybe we should have adapted a system similar to Chinese where there are thousands of characters to know!
Seriously though:
Or even better: just use "x dot" in the Newtonian schema (dots on top of variables denote derivative w/r/t time). I think he actually made pin***** holes in paper for it !
x' (prime) = v, x'' = v' = a.
I just did all this in Physics (school's out w000t! ) so lemme see.
E (vector) = -dV/dx. V = potential, say you have 100V between two plates seperated 1m, the E field is 100V/m and pointed towards the negative plate. Likewise, V = integral E dot dx.
If anyone cares, the E-field at a point P is given by Q R(hat) /(4*pi*Eo*r^2) where R(hat) is the direction of r(vector), Q is charge in coulombs and Eo is epsilon naught, permitivity of space. You can do all sorts of integrals to evaluate the E-field due to various shapes of charges (using dQ).
Oh yeah, we were talking about symbols. W is used a lot. You have W (work = F * x (vectors, force dot distance) in joules), W (weight = m*g*y in newtons), W for watts (force dot velocity or work dot distance), all kinds of stuff. K's are always used a lot.
For electronics, we use V for volts, E for field, I, R, etc. U is potential energy, -deltaW (a work W). Like the potential energy of a gravitational system (U = m*g*deltaY) or an electric one (F = q1*q2*R(hat)/4*pi*Eo*r^2, aka coulomb force, evaluated over some distance to make that force an energy (W=f*d) and thus energy potential difference).
Tim
I just did all this in Physics (school's out w000t!
) so lemme see.E (vector) = -dV/dx. V = potential, say you have 100V between two plates seperated 1m, the E field is 100V/m and pointed towards the negative plate. Likewise, V = integral E dot dx.
If anyone cares, the E-field at a point P is given by Q R(hat) /(4*pi*Eo*r^2) where R(hat) is the direction of r(vector), Q is charge in coulombs and Eo is epsilon naught, permitivity of space. You can do all sorts of integrals to evaluate the E-field due to various shapes of charges (using dQ).
Oh yeah, we were talking about symbols. W is used a lot. You have W (work = F * x (vectors, force dot distance) in joules), W (weight = m*g*y in newtons), W for watts (force dot velocity or work dot distance), all kinds of stuff. K's are always used a lot.
For electronics, we use V for volts, E for field, I, R, etc. U is potential energy, -deltaW (a work W). Like the potential energy of a gravitational system (U = m*g*deltaY) or an electric one (F = q1*q2*R(hat)/4*pi*Eo*r^2, aka coulomb force, evaluated over some distance to make that force an energy (W=f*d) and thus energy potential difference).
Tim
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