Speaking of science...
No, seriously (giggle), I teach shop and science here at a tiny little private school for bright kids with learning "differences". I'm going to float this one with my 7th/8th grade science group, justback from the hilodays, to wake up their analytical processors. Hasn't anyone of you/us/them played with a rubber band balsa plane and a treadmill?
Jonathan
A guy up the road here named Pitcairn, where now stands the doomed Willow Grove Joint Reserve Base, once built these little personal helicopters he wanted to sell everyone. Can you imagine the average american juggling coffee and talking on the cell phone and fiddling with the radio while a thousand feet off the ground!?
No, seriously (giggle), I teach shop and science here at a tiny little private school for bright kids with learning "differences". I'm going to float this one with my 7th/8th grade science group, justback from the hilodays, to wake up their analytical processors. Hasn't anyone of you/us/them played with a rubber band balsa plane and a treadmill?
Jonathan
A guy up the road here named Pitcairn, where now stands the doomed Willow Grove Joint Reserve Base, once built these little personal helicopters he wanted to sell everyone. Can you imagine the average american juggling coffee and talking on the cell phone and fiddling with the radio while a thousand feet off the ground!?
Attachments
Re: we used conveyor belts at UPS...
Allright we have another taker!
If the plane has made any progress whatsoever along the belt, it indicates the wheels are turning faster than the belt which we know is not the case.
The thrust being independant of the wheel movement unfortunately doesn't even enter into it.
The plane remains stationary.
Wanna try again?
jkratz said:
Allright we have another taker!
If the plane has made any progress whatsoever along the belt, it indicates the wheels are turning faster than the belt which we know is not the case.
The thrust being independant of the wheel movement unfortunately doesn't even enter into it.
The plane remains stationary.
Wanna try again?
Hi Cal,
Again??
Okay, the belt moves in such a way as to oppose (or stop) the wheels from rotating. That's fine, the plane takes off while the wheels remain stationary.
BTW, I didn't start it again this time!
-Chris 😀
Again??
Okay, the belt moves in such a way as to oppose (or stop) the wheels from rotating. That's fine, the plane takes off while the wheels remain stationary.
BTW, I didn't start it again this time!
-Chris 😀
One day I'll read the whole thread .....
but
what if the conveyor belt was also on wheels?
up up and away Scotty !
but
what if the conveyor belt was also on wheels?
up up and away Scotty !
Hi Quasi,
There isn't enough beer in the world to have me read this entire thread again!
Hi jkratz,
-Chris
There isn't enough beer in the world to have me read this entire thread again!
Hi jkratz,
Sadly, yes. You forgot shaving and my most popular favorite .... putting on makeup. That would be average Canadian in Toronto. The worlds absolute worst drivers I'm sure!
-Chris
The belt is moving in the same direction as the plane, yeh, it flies, but it's when it appears to counteract the forward movement by spinning the wheels in the wrong direction. I still think the plane moves even if the wheels go backwards faster than they should, 'cause the engines are pushing on the air, and the belt doesn't stop that from happening, right? Where does the thrust go, then? Perhaps that's where I'm wrong, if I'm wrong. Where does the thrust go against the air above the ground, even if the belt is screwing with the designed intent of the wheels? You still get forward movement of the plane, right? RIGHT!? You have a plane going 95 mph and wheels going backwards at some incredible proprtionate rate along with a rediculously speedy conveyor belt with hopefully a perfect surface --! The plane is still moving, I say. And yes, when there's time, I'll read the whole thread.
Anyhoo, time to go home in this particular slice of the planet. See y'all tomorrow.
Jonathan
Anyhoo, time to go home in this particular slice of the planet. See y'all tomorrow.
Jonathan
Jonathan,
Read my post again, especially the part about the difference in wheel and belt speed. Again, if the plane has made progress in relation to the ground, along the belt, it means the wheels are turning faster than the belt.
Please take heart in the fact that some of us (well me actually) flip flopped on this one until all the marbles were in place. Now I feel rather confident, even though it took a while to get to this point.
Chris, I don't know what to do with you man. Maybe this
😀
Read my post again, especially the part about the difference in wheel and belt speed. Again, if the plane has made progress in relation to the ground, along the belt, it means the wheels are turning faster than the belt.
Please take heart in the fact that some of us (well me actually) flip flopped on this one until all the marbles were in place. Now I feel rather confident, even though it took a while to get to this point.
Chris, I don't know what to do with you man. Maybe this
😀
Ouch man!I am convinced that I am correct. Anything else does not take into account all the forces at play. The largest force (thrust) will prevail.
Well, that resolution lasted longer than most. 😉
And the next topic:
Sixteen tons, what do you get
Another day older and deeper in debt
Say brother, don't you call me, cause I can't go
I owe my soul to the company store...
Discuss, from the aspect of the Hegellian dialectic. Points will be gained by introducing the nature of the proletariat.
And the next topic:
Sixteen tons, what do you get
Another day older and deeper in debt
Say brother, don't you call me, cause I can't go
I owe my soul to the company store...
Discuss, from the aspect of the Hegellian dialectic. Points will be gained by introducing the nature of the proletariat.
Looks like the runway has to move.
If everything else is contradictory then the runway will move (given enough thrust) to allow the plane to take off....
......I wasn't expecting warp 12 captain.....she won't take it..
Enough beer to read the thread ....oh well if I gotta (Australian view).
Cheers
If everything else is contradictory then the runway will move (given enough thrust) to allow the plane to take off....
......I wasn't expecting warp 12 captain.....she won't take it..
Enough beer to read the thread ....oh well if I gotta (Australian view).
Cheers
Here we go again ... weeeeeee!
What do you say Cal, Canadians by nature have opposing views on everything. How else can you explain this country?? 😀
-Chris
There you go quasi! It moves.
What do you say Cal, Canadians by nature have opposing views on everything. How else can you explain this country?? 😀
-Chris
This also means I can't fly into Vancouver. Planes don't fly. They seem to work fine in Toronto! 
-Chris
-Chris
This feels like trying to make sense of an M.C. Escher drawing, given your knowledge of the real world, but the apparently obvious evidence of your eyes (the tricky flat drawing).
Just tell me what happens to the thrust of the engines.
Just tell me what happens to the thrust of the engines.
jkratz said:
Ignore this lot, the're just playin' with ya.
The thrust of the engines can ONLY work on the plane as it is decoupled from the belt by the axles of the wheels.
You just have to determine whether or not the wheels move so fast that they explode and the plane takes a dive into the ground.
The question does not make enough specifics to determine this factor...therefore lets ignore that bit.....Oh yeh, then you have to ignore the whole question.....
This is better than work......but now it's time to go home
Lee
Hi Lee,
I was just wondering. At the instant in time that the wheels explode (as many feel they do), what exactly does the belt do?
I vote it explodes as well to keep up with the bits of tire travelling everywhere.
-Chris
I was just wondering. At the instant in time that the wheels explode (as many feel they do), what exactly does the belt do?
I vote it explodes as well to keep up with the bits of tire travelling everywhere.
-Chris
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