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re: Can this 747 take off?
Posted on 4/11/24 at 9:39 pm to PhysicsGuy
Posted on 4/11/24 at 9:39 pm to PhysicsGuy
Yes I get it that it’s impossible but the riddle implies that the speeds match, any natural scenario would have the thrust force dominate the frictional drag.
1
Posted on 4/11/24 at 9:50 pm to Power-Dome
It doesn’t imply that, you interpreted it that way. The question is from world of engineering and it says the belt is designed to match the speed.
Engineering answer is it’s not possible to design it mathematically. What happens is the backwards speed of the belt is offset by the forward speed of the wheels, as designed…As soon as the engines add an independent source of forward motion the belt will perpetually be behind by that number.
You increase the belt by 1000 mph the wheels go 1000 mph faster so they cancel each other out. You’re left with only the forward thrust and the plane takes off as normal.
Engineering answer is it’s not possible to design it mathematically. What happens is the backwards speed of the belt is offset by the forward speed of the wheels, as designed…As soon as the engines add an independent source of forward motion the belt will perpetually be behind by that number.
You increase the belt by 1000 mph the wheels go 1000 mph faster so they cancel each other out. You’re left with only the forward thrust and the plane takes off as normal.
This post was edited on 4/11/24 at 9:52 pm
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