The worlds longest long jump
Discussion
Bear with me here..... Following the Ex's startling mini science experiment I started to think. Were the worlds longest long jumps all done facing in the same direction?
I did my little experiment and on a good jump, I would always come down about 1" to the east from where I started. Now a long jumper is probably in the air for about 2 seconds, which would equate to a 2" movement of the planet beneath them.
So, in theory there should be a 4" difference depending on which way the track faces. Obviously if you were to jump at either pole, it would make no difference, but in theory the best long jump should be completed on the equator facing east....
Unless you know otherwise
I did my little experiment and on a good jump, I would always come down about 1" to the east from where I started. Now a long jumper is probably in the air for about 2 seconds, which would equate to a 2" movement of the planet beneath them.
So, in theory there should be a 4" difference depending on which way the track faces. Obviously if you were to jump at either pole, it would make no difference, but in theory the best long jump should be completed on the equator facing east....
Unless you know otherwise
BliarOut said:
...Now a long jumper is probably in the air for about 2 seconds, which would equate to a 2" movement of the planet beneath them.....
But someone jumping from the surface of the earth, is already travelling in it's direction of rotation.
does that makes sense? I'm trying to think of an example, but I'm no Newton!
BliarOut said:
Unless you know otherwise
The atmosphere is carrying you along at the same rate, so there will be no effect. It's all relative y'know. Plus, just jumping is no use as your foot muscles will influence direction.
Try a tall windfree enclosure (church steeple) and fire a ball bearing up as high as you can without it hitting the roof.
Then run before the vicar catches you
Relativity, that was the word I was grasping for.
Imagine doing a long jump along the deck of an aircraft carrier doing 30 knots.
From the perspective of a fixed point in space, whilst in the air, you've jumped:
the distance of the actual jump + the distance the ship travelled + the distance the earth rotated
From the perspective of the coast, watching the ship sail past, you've jumped:
The jump + the distance the ship travelled +(or minus) the current of the water
From the perspective of the ship, you've jumped:
The distance of the jump, and nothing else.
Complicated eh?
Imagine doing a long jump along the deck of an aircraft carrier doing 30 knots.
From the perspective of a fixed point in space, whilst in the air, you've jumped:
the distance of the actual jump + the distance the ship travelled + the distance the earth rotated
From the perspective of the coast, watching the ship sail past, you've jumped:
The jump + the distance the ship travelled +(or minus) the current of the water
From the perspective of the ship, you've jumped:
The distance of the jump, and nothing else.
Complicated eh?
BliarOut said:
So I thought until the other day....
To prove it, in the first instance, go find a known datum, such as a paving slab, doorway etc facing east/west. Jump up high. You don't land where you took off as the earth rotates beneath you!
Sorry, but I can't swallow that. It's just inconsistencies in your jump. when you take off, you're already travelling East(along with everything else on the planet).
What happens if you throw a ball up in the air while travelling in a car at 70mph? The ball does not stay where it is in relation to the earth, it travels along with you in the car because it's already travelling at 70MPH itself. You are already travelling at the same speed as the earth is rotating so surely you would still be travelling at the same speed when you are in the air? Therefore you would land in the same spot and the earth would not have rotated under you.
So I thought.... So I tried it facing in every conceivable direction.... And I always went the same way. Try it yourself if you don't believe me. I just had a karate instructor, who prided himself in always coming down in the same spot looking flummoxed when he didn't.
It's all down to the coriolis effect apparently.
http://zebu.uoregon.edu/~js/glossary/coriolis_effect.html
It's all down to the coriolis effect apparently.
http://zebu.uoregon.edu/~js/glossary/coriolis_effect.html
sccbishop said:
If you throw a ball up in the car at 70 mph when under acceleration, the ball will travel backwards relative to you. If you are a steady speed, and the ball does not encounter any horizontal air resistance, it will land directly under where you threw it up.
Yeah, you'd have to throw it up in the air inside a big tube or behind a piece of wood, otherwise the wind resistance would mean it would just land behind the car.
Nevin said:
If you throw a ball up in the car at 70 mph when under acceleration, the ball will travel backwards relative to you. If you are a steady speed, and the ball does not encounter any horizontal air resistance, it will land directly under where you threw it up.
Yeah, you'd have to throw it up in the air inside a big tube or behind a piece of wood, otherwise the wind resistance would mean it would just land behind the car.
Are you in a convertible? 
BliarOut said:
So I thought.... So I tried it facing in every conceivable direction.... And I always went the same way. Try it yourself if you don't believe me. I just had a karate instructor, who prided himself in always coming down in the same spot looking flummoxed when he didn't.
It's all down to the coriolis effect apparently.
No, it's due to experimenter expectation... try it inside a large opaque cylinder which is rotating slowly about a vertical axis, so you have no idea which way you're facing when you jump. Get someone to film each jump, using an x-ray camera or something that can see through the walls of the cylinder. You will find that the effect disappears.
Bugger, the kids broke my opaque rotating x-ray machine only last night.. I told them to be more careful with it
I've been googling. The coriolis effect definitely exists. Long range gunners first discovered something wasn't quite right when they kept missing the target. It's this that was one of the factors that led to the discovery of the earth rotating... Apparently.
When a body leaves the earths surface, it retains it's original trajectory, but the earth rotates beneath it.
Where's a PH pilot when you need one? They would be able to give a good explanation I am going to try this with an unbriefed, and probably unwilling volunteer later..... I'm intrigued.
Look at what you have started Ex.... This is worse than hallucigate
I've been googling. The coriolis effect definitely exists. Long range gunners first discovered something wasn't quite right when they kept missing the target. It's this that was one of the factors that led to the discovery of the earth rotating... Apparently.
When a body leaves the earths surface, it retains it's original trajectory, but the earth rotates beneath it.
Where's a PH pilot when you need one? They would be able to give a good explanation
I am going to try this with an unbriefed, and probably unwilling volunteer later..... I'm intrigued. Look at what you have started Ex.... This is worse than hallucigate
BliarOut said:
Long range gunners first discovered something wasn't quite right when they kept missing the target. It's this that was one of the factors that led to the discovery of the earth rotating... Apparently.
Bollocks - that's just crap gunners. Earth's rotation was known and proven well before guns had a long enough range to be effected.
BliarOut said:
When a body leaves the earths surface, it retains it's original trajectory, but the earth rotates beneath it.
We're tslking escape velocity's and distances here - way different from the experimnentally flawed results you're discussing..
Fatboy said:
Long range gunners first discovered something wasn't quite right when they kept missing the target. It's this that was one of the factors that led to the discovery of the earth rotating... Apparently.
Bollocks - that's just crap gunners. Earth's rotation was known and proven well before guns had a long enough range to be effected.
Go Google.... It's a recurring thread. Rob admit it - you've been on the sauce mate!
World LJ record - is 8.95m - US Mike Powell in 1991.
Bob Beamon's famous jump in Mexico in 1968 was at altitude where the air is thinner.
But Peterborough is 50m below sea level or something like that - so if you go up to Castor Hil you may jump even further ...
You're on the right lines though ...
World LJ record - is 8.95m - US Mike Powell in 1991.
Bob Beamon's famous jump in Mexico in 1968 was at altitude where the air is thinner.
But Peterborough is 50m below sea level or something like that - so if you go up to Castor Hil you may jump even further ...
You're on the right lines though ...
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