Zequez
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 Apr 3 comment Why am I getting that work it's always the same in both directions? Edit: Sorry the $V$ integrals on the first comment should be negative. But the conclusion doesn't really change. Apr 3 comment Why am I getting that work it's always the same in both directions? Yes, but the question it's still there, what's that I'm doing wrong with the integrals that I get that $\Delta V_{AB}= \Delta V_{BA}$? Apr 3 comment Why am I getting that work it's always the same in both directions? Ok forget about the work. Replace everything with electric potential difference from $A$ to $B$, $\Delta V_{AB} = \int_a^b\vec{E}.\vec{ds}= \int_a^b E.dr.cos(0º)= \int_a^b E.dr$ and then measure the difference from $B$ to $A$, $\Delta V_{BA} = \int_b^a\vec{E}.\vec{ds}=\int_b^a E.dr.cos(180º)= -\int_b^a E.dr = \int_a^b E.dr$, so you get that $\Delta V_{AB} = \Delta V_{BA}$, which is obviously wrong. And of course, if you go by the clearer definition, $\Delta V_{AB}=V_B-V_A$ and $\Delta V_{BA}=V_A-V_B$ it's pretty clear that $\Delta V_{AB} = -\Delta V_{BA}$. Apr 3 asked Why am I getting that work it's always the same in both directions? Oct 15 comment I'm having trouble wrapping my head around force, and thus acceleration, diminishing with a higher velocity when using a constant power But I don't understand why is it relevant that is a rocket. I mean, I could have made the same example with a car, or 2 blocks being pulled with a string. Oct 15 comment I'm having trouble wrapping my head around force, and thus acceleration, diminishing with a higher velocity when using a constant power Ok, so, what if it's an electric rocket? Oct 13 comment I'm having trouble wrapping my head around force, and thus acceleration, diminishing with a higher velocity when using a constant power But I don't understand, how can an engine use 2 different amounts of power at the same time? How is that physically possible?? I never said acceleration to be constant, I meant the power to be constant, so accelerations diminishes with velocity. Oct 13 comment I'm having trouble wrapping my head around force, and thus acceleration, diminishing with a higher velocity when using a constant power Everything but $a_{AB}$, and $v_{AB}$ is relative to an stationary frame of reference. Also, I meant that the power is constant, it stays the same. Oct 13 asked I'm having trouble wrapping my head around force, and thus acceleration, diminishing with a higher velocity when using a constant power Feb 27 awarded Scholar Feb 27 accepted If photons move linearly, what's actually stopping them from passing through a microwave oven mesh? Feb 27 comment If photons move linearly, what's actually stopping them from passing through a microwave oven mesh? The part of the reflection interfering with the rest of the wave was the part that made me understand it (I think). So if this is the case, does it means that the first photons in the wave to reach the "wall" can actually pass through the holes because there wasn't any reflected wave interfering with them? Feb 27 awarded Supporter Feb 27 revised If photons move linearly, what's actually stopping them from passing through a microwave oven mesh? added 232 characters in body Feb 27 revised If photons move linearly, what's actually stopping them from passing through a microwave oven mesh? added 335 characters in body Feb 27 awarded Editor Feb 27 revised If photons move linearly, what's actually stopping them from passing through a microwave oven mesh? added 420 characters in body Feb 27 awarded Student Feb 27 asked If photons move linearly, what's actually stopping them from passing through a microwave oven mesh?