Author Topic: Easy Aviation question...that I cannot answer!!! (Read 2111 times)

vorticon · « **Reply #30 on:** November 17, 2003, 09:41:11 PM »

vulcan i just made it easier to understand for laymen (technically i am one...just over halfway through grade 11 physics...only just finishing up circular motion...)

BlckMgk · « **Reply #31 on:** November 17, 2003, 10:13:51 PM »

Quote

Originally posted by AKIron
What happens if your bus is doing the speed of light and you jump up?

Oh yeah smart guy... what happens if you're in your car traveling at the speed of light, and turned on your headlights.. would they do anything?

XNachoX · « **Reply #32 on:** November 17, 2003, 10:18:27 PM »

Quote

Originally posted by BlckMgk
Oh yeah smart guy... what happens if you're in your car traveling at the speed of light, and turned on your headlights.. would they do anything?

no as theoretically nothing can go faster than c, theoretically.
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Vulcan · « **Reply #33 on:** November 17, 2003, 10:34:15 PM »

Quote

Originally posted by cpxxx
Fascinating things gyros. A spinning gyro will attempt to maintain it's position in SPACE not the Earth. So the gyros in the aircraft will attempt to tilt or topple back towards it's original position in space at a known rate. Precession. This of course makes them useful for navigation. I always found that fact to be quite weird. I mean how do gyros know??????

Plus if you apply a force to a spinning gyro it will react at 90 degrees to the applied force, again useful for attitude indicators in aircraft. You can prove this by spinning a wheel in your hands. If you try turn the wheel left or right it will resist with a force 90 degrees to the force applied by you.

Its all to do with the fact that the wheel is actually accelerating as it spins (not a net acceleration in rotationial speed, but as each part of the wheel rotates it is constantly changing direction in movement which = acceleration and deceleration) and then I get all confused cos I'm rusty and the red bull has worn off.

udet · « **Reply #34 on:** November 17, 2003, 11:09:36 PM »

hahahhahaha:aok

Otto · « **Reply #35 on:** November 18, 2003, 09:20:51 AM »

Quote

Originally posted by AKIron
What happens if your bus is doing the speed of light and you jump up?

Time stops at the speed of light so I'm afriad you can't do anything, including stopping the bus and getting off.

miko2d · « **Reply #36 on:** November 18, 2003, 02:49:27 PM »

muckmaw: So then flying in the atmosphere could be equated to swimming in the ocean, really.

When flying east a plane weights about 1/400th less than when it is flying west.

Vulcan: If there were no atmosphere and you jumped you would still fall in the same spot.

That depends how high you were when you jumped. Your linear velocity up high would be greater than "the same"spot" on the Earth's surface, even if your angular velocity was the same.

AKIron: What happens if your bus is doing the speed of light and you jump up?

You will gain a lot of weight. You must also watch carefully juming in as the bus will seem to be infinitesmally short.

miko

Vulcan · « **Reply #37 on:** November 18, 2003, 05:33:03 PM »

Quote

Originally posted by miko2d
Vulcan: If there were no atmosphere and you jumped you would still fall in the same spot.

That depends how high you were when you jumped. Your linear velocity up high would be greater than "the same"spot" on the Earth's surface, even if your angular velocity was the same.

Only if you believe in a flat earth.

Climb the highest mountain, jump, you'll land in the same spot. Find the lowest valley same thing.

Now, find the tallest cliff, jump off it, you do not suddenly speed away from the cliff even though in theory "1000mph" rotational speed at the top is higher than the speed at the bottom.

Why? Because of gravity. Gravity is constantly accelerating and decelerating us relative to the earths spin, just as in the gyroscopic effective discussed above.

miko2d · « **Reply #38 on:** November 18, 2003, 05:43:32 PM »

Vulcan: Now, find the tallest cliff, jump off it, you do not suddenly speed away from the cliff even though in theory "1000mph" rotational speed at the top is higher than the speed at the bottom.

Not speed away, no - you would move slightly to the east. The top of the cliff has greater linear velocity than the bottom.
If you stand on top of a 1000 ft cliff, you are doing extra ~6280 feet with every revolution of the Earth compared to the sea level.
A top of a cliff as high as the Earth's radius would be moving twice as fast as it's bottom.
The gravity would pull you straight down but your 1000mph horisontal velocity relative to the bottom would not go anywhere.

miko

Tarmac · « **Reply #39 on:** November 18, 2003, 05:49:20 PM »

Quote

Originally posted by GScholz
Which is a myth, not reality.

Are you serious?

Quick, Vulcan, go flush your toilet and tell us which way it spins!

ed: you are from NZ, IIRC, right?

ravells · « **Reply #40 on:** November 18, 2003, 05:55:46 PM »

Cor! so many Einstiens...so little time!

I have no idea about this stuff.

Ravs