# IS THIS CORRECT ?

• December 22nd, 2008, 02:21 PM
BARCUD
IS THIS CORRECT ?
GENERAL RELATIVITY - a personal physical experience is relative. Well known example, a jet flying at a constant speed, looking down out of the jet passenger window it would seem the jet was hardly travelling forward at all, from the ground looking up the jet would appear to be flying forwards slowly, standing on the runway as the jet flew over the jet would be travelling forward extremely fast. The jet is travelling at the same speed in all scenarios but where one is in relation to the jet determines what speed the jet appears to be travelling at ?

CONSERVATION OF ENERGY - the energy stored in any given object is constant, the energy remains constant but it can be turned into another type of energy through certain processes. e.g. the energy in a piece of coal remains the same, but once burning the piece of coal has a different type of energy which itself remains constant ?

How am I doing ?

BARCUD
• December 22nd, 2008, 07:05 PM
DrRocket
Re: IS THIS CORRECT ?
Quote:

Originally Posted by BARCUD
GENERAL RELATIVITY - a personal physical experience is relative. Well known example, a jet flying at a constant speed, looking down out of the jet passenger window it would seem the jet was hardly travelling forward at all, from the ground looking up the jet would appear to be flying forwards slowly, standing on the runway as the jet flew over the jet would be travelling forward extremely fast. The jet is travelling at the same speed in all scenarios but where one is in relation to the jet determines what speed the jet appears to be travelling at ?

CONSERVATION OF ENERGY - the energy stored in any given object is constant, the energy remains constant but it can be turned into another type of energy through certain processes. e.g. the energy in a piece of coal remains the same, but once burning the piece of coal has a different type of energy which itself remains constant ?

How am I doing ?

BARCUD

I think you need to take a physics course or read a physics text. Fundamentals of Physics by Haliday, Resnick and Walker is pretty good.
• December 23rd, 2008, 03:45 AM
Leszek Luchowski
Re: IS THIS CORRECT ?
Quote:

Originally Posted by BARCUD
GENERAL RELATIVITY - a personal physical experience is relative. Well known example, a jet flying at a constant speed, looking down out of the jet passenger window it would seem the jet was hardly travelling forward at all, from the ground looking up the jet would appear to be flying forwards slowly, standing on the runway as the jet flew over the jet would be travelling forward extremely fast. The jet is travelling at the same speed in all scenarios but where one is in relation to the jet determines what speed the jet appears to be travelling at ?

This has nothing to do with relativity; no jet travels fast enough to produce any relativistic effects noticeable to the naked eye.

Your observations are simply due to perspective. A jet moves so and so many meters per second, which means so and so many times its own length. If it is flying high up in the sky, and you look at it from the ground, the plane looks very small, and the distance it covers every second is also scaled down, in your eyes.

Imagine climbing a mountain and looking at an F1 racing track way down in the valley. The whole track will look tiny, and the vehicles travelling its entire circumference in one minute forty secs will seem to hardly move at all. Even if you know they are really moving at breathtaking speeds.

Cheers, L.
• December 23rd, 2008, 02:53 PM
BARCUD
Damn ! I am reading texts about physics BUT it would appear it ain't going in !?

Maybe some brains are geared towards science and some aren't ! Guess which category I fall into ?

thanks guys,

BARCUD