\forall \exists \emptyset | \Re

Problem, motorboat companies?

Note by John Muradeli
5 years 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 - 5 years ago

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I have a better idea:

s s

John Muradeli - 5 years ago

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I was like "Whaat?!", Trolololl!!! Light has no mass, so by conservation of linear momentum, that troll won't go forward. -_-

Satvik Golechha - 5 years 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 - 5 years ago

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@Michael Mendrin It takes around 10000 bulbs to lift a sock

Krishna Sharma - 5 years 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 - 5 years 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 - 5 years ago

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@Michael Mendrin Wait.. WHAT?

still have MOMENTUM? without MASS?!?

uum.... Ok I'm outa here.

John Muradeli - 5 years 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 - 5 years 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=Fnetma=Fnet0aa=\frac{F_{net}}{m}\Rightarrow a=\frac{F_{net}}{0}\Rightarrow a \rightarrow \infty

John Muradeli - 5 years ago

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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 - 5 years ago

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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 - 5 years 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 - 5 years 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 - 5 years ago

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How do you know it won't go backward? :P

Tan Li Xuan - 5 years ago

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Water is diamagnetic. So, I think it wont be possible.

Kartik Sharma - 5 years ago

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

Can you tell now why this won't happen?

John Muradeli - 5 years ago

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