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Problem, motorboat companies?

Note by John Muradeli
2 years, 11 months ago

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Eh, but you can blow your own sail with a fan on the boat, and move the boat forward. That can actually work. So, maybe motorboat companies should give this one another look? (??)

Fan Sail

Fan Sail

Michael Mendrin · 2 years, 11 months ago

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@Michael Mendrin Dam that pic's on point! Ok now we're getting serious:

So, here's what I think (and I think you know): The propeller, displacing the air forward, pushes itself backwards (N3L), which is the same case with the magnet but in a more indirect way. But the aerodynamics work with pressure in complicated ways to actually make this work. Buut... all this jazz compared to the motor boat, which spins a smaller fan under water much more effectively (even having a "push-off" effect that everyone relies on when trying to disprove rocket science), so yeah... Motorboat companies ain't goin bankrupt any time soon. John Muradeli · 2 years, 11 months ago

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@John Muradeli No, not likely any time soon. However, this does remind me of a real interesting physics problem, which is that it's possible for a cart, fitted with a propeller that connects to the wheels mechanically, to go downwind faster than the wind! Many say this is impossible, but it's been done, the record being almost three times downward wind speed. Michael Mendrin · 2 years, 11 months ago

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@Michael Mendrin Oh lol that's a no brainer for me - I know why sailing upwind is faster, so I can treat the propellers as sails and apply the same principle and BAM! you can go TEN TIMES faster than the wind. But before that your cart will probably fly apart... Lol John Muradeli · 2 years, 11 months ago

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@John Muradeli Uh, it's downwind, John. With a sailing boat, going directly downwind, well, it's hard to go faster than the wind itself. Do you know of a way to go faster downwind? In theory, if a sailboat is going as fast as the wind, with the wind directly at it's back, then onboard, one wouldn't feel much of any wind at all in any direction.

But, yes, when tacking, which is going crosswinds, making clever use of sails, re-direction, and keels, one can go faster than the wind itself. Maybe counterintuitive for non-sailors. Michael Mendrin · 2 years, 11 months ago

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Comment deleted Oct 16, 2014

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@John Muradeli I have bad news for you. I've always hated statistics, and so I'm not much good with that. So much for my being "Mr Mathopedia". Michael Mendrin · 2 years, 11 months ago

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@Michael Mendrin Daam... well alright. Tho I gotta say I kinda changed my opinion on statistics once I started learning (I also was like AH SCREW DIS STATISTICS ALL BS UNCERTAINTY BLABLA). but okie dokie.

Ah and no matter. You're still Mr. Mathopedia.

Cheers, awesome Mendrin ;) John Muradeli · 2 years, 11 months ago

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@Michael Mendrin I have a better idea:

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John Muradeli · 2 years, 11 months ago

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@John Muradeli I was like "Whaat?!", Trolololl!!! Light has no mass, so by conservation of linear momentum, that troll won't go forward. -_- Satvik Golechha · 2 years, 11 months ago

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@Satvik Golechha "Light has no mass..."

Be careful what you state there. Light is affected by gravity (evidence - light curves around a black hole and stars), meaning it interacts with the higgs field - so, it does have some mass.

Massles particles - tachyons -are yet to be discovered. And remember the implications of "massless":

\(a=\frac{F_{net}}{m}\Rightarrow a=\frac{F_{net}}{0}\Rightarrow a \rightarrow \infty\) John Muradeli · 2 years, 11 months ago

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@Satvik Golechha Actually, even though photons have no mass, they can still have energy and momentum, so that troll can go forward. But just not very speedily. Michael Mendrin · 2 years, 11 months ago

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@Michael Mendrin It takes around 10000 bulbs to lift a sock Krishna Sharma · 2 years, 11 months ago

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@Michael Mendrin no no hold on a second, what about what I said above? light b... wait. is this because space bends and light just follows it and thus light doesnt bend but it bends relative to other space... ?? errrr John Muradeli · 2 years, 11 months ago

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@Michael Mendrin Wait.. WHAT?

still have MOMENTUM? without MASS?!?

uum.... Ok I'm outa here. John Muradeli · 2 years, 11 months ago

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@Michael Mendrin Yes sir, I kinda' knew that, I was just trying to troll an already trolled troll trolling trollers... :-P Satvik Golechha · 2 years, 11 months ago

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@Satvik Golechha And I was trying to troll a troll that trolled a trolled troll trolling trollers...

s

s

John Muradeli · 2 years, 11 months ago

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Water is diamagnetic. So, I think it wont be possible. Kartik Sharma · 2 years, 11 months ago

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@Kartik Sharma Actually, that's not the reason why. See Conceptual Physics I.

Can you tell now why this won't happen? John Muradeli · 2 years, 11 months ago

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How do you know it won't go backward? :P Tan Li Xuan · 2 years, 11 months ago

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