Recent content by FBayer

Right, okay, I figured it out today: First reformulate F as change in momentum (assuming v is constant) F = \frac{\mathrm{d} p}{\mathrm{d} t} = \frac{\mathrm{d} m\vec{v}}{\mathrm{d} t} = \frac{\mathrm{d} m}{\mathrm{d} t}\vec{v} Substitute available variables into dm/dt. \frac{\mathrm{d}...

Hmm, I've tried finding some materials on that...are you sure that level of complication is necessary? Because this ("Evaluation of the Induced Velocity Field of an Idealised Rotor") talks about things like Taylor series, vector fields and vorticity, which are all things we haven't even come...

Is there? Let's look at the units. m = kg g = ms-2 r = m ρ = kgm-3 I don’t see any second unit involving time here, so there’s no way to get to ms-1, which is what we want – velocity.

The error is in that you're using the wrong formulae and making up arbitrary values. The formula to be used here is W = Fd (work = force × distance). Work is the same concept as energy. If you use that, you can see that the energy is the same for both, because if the Force and the distance...

So, I got a challenge question from my physics teacher but despite attacking it from different angles I’m not quite sure I’ve gotten the correct solution, in fact most of it was just shady assumptions which I’m not sure were supposed to be made, so I’d like to ask whether this is anywhere near...