Did the Apollo missions have a plan in case they "missed" the moon? |
| Did the Apollo missions have a plan in case they "missed" the moon? Posted: 01 Jan 2022 08:18 AM PST Sounds silly, yeah but, what if it did happen? It isn't very crazy to think about that possibility, after all, the Apollo 13 had an oxygen failure and had to abort landing, the Challenger sadly ignited and broke apart a minute after launch, and various soviet Luna spacecrafts crashed on the moon. Luckily, the Apollo 13 had an emergency plan and could get back safe and sound, but, did NASA have a plan if one of the missions missed the moon? [link] [comments] |
| What does it even mean for energy to flow through the electromagnetic field? Posted: 31 Dec 2021 01:17 PM PST Where I'm confused is, when we talk about the flow of energy in a circuit, when are we talking about the electrons and when are we talking about the fields? I don't get why the energy of the field isn't the energy of the kinetic energy of the electrons; or maybe I'm just misunderstanding what that means. Let me explain my thought process so I can specify exactly where my confusion lies: First, there has to be a current in order for there to a flow of electrical energy, right? And if we consider current in terms of the E field, what happens is that the movement of the electrons that creates a disturbance in the E field by varying the value of the E field in space, like a wave, yes? (Although that disturbance isn't what's meant by EM waves, I don't think.) That energy that causes the disturbance is from the electrons. Isn't that the same energy that's flowing in the circuit, just the energy carried by a water wave is from the movement of the water molecules, even though the movement of the wave is distinct from the movement of the molecules? As I think about this more, I'm wondering if it isn't somewhat an issue of semantics. I mean, it's debatable whether the EM field is even a physical thing at all or just an incredibly useful abstraction.* I guess maybe part of it is that I'm not sure entirely clear on the mathematics. I've studied Maxwell's equations, Coloumb's law, and the Lorentz force law, both in University Physics 2 and in Introduction to Electromagnetics, and they all make sense (though I admittedly have a hard actually internalizing Maxwell's equations; I almost invariably have to look them up and review what each one actually means if I want to talk about them in any detail). In principle, that should explain all of classical electrodynamics, and yet I don't see how any of them explain energy flow. [link] [comments] |
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