/sci/ - Science & Math

>>11357882
If [math] \mathbf{V}_{rms}=A\exp({j\phi}) [/math], then [math] V(t)=A\sqrt{2}\cos(\omega t+\phi) [/math]. When moving from phasor domain to time domain, you're only going to care about the real part of the phasor. Electrical engineering is just incredibly gay like that. Also, remember that the root-mean-square of the amplitude V of a sinusoidal signal is V/sqrt2.
The correct answer is a).

"Mathematical proofs" are just arguments of a sort. And like any other argument, they can be very rock solid, totally indisputable, or they can be somewhat dubious or weak, even if the the statement to be proven is known to be correct.
The pic in the OP is certainly an argument for the Pythagorean theorem, therefore it counts as a proof.
>>11339249
Only applies to right triangles. I can think of a way to sketch up a visual proof for any kind of triangle, but I am lazy.

>>11142815
>>>/lefytpol/
this is a free market board. racism doesn't belong.

>>11140624
"No"
It is in best interest of those who want to make and save a buck to curb their pollution.

[eqn]E_C=\frac{1}{2}CV^2,\ \ E_L=\frac{1}{2}LI^2[/eqn]
where
[eqn]V=V_0\exp{j(\omega t+\phi_v)}[/eqn]
[eqn]I=I_0\exp{j(\omega t+\phi_i})[/eqn]

>>11071856
>>11071859
Unlike you, Tooker is actually enjoyable to have on this board.

/libertypilled/ thread
/sci/ is a free market and small govt. board.