Cyprus-Forum.com

[cyprusgrump]

Seriously, the jump began in the stratosphere (20..50km) and he then went through the troposphere (6..20km) so given that he encountered variable air density, temperature, and pressure, his speed would’ve had to be constantly calculated by a computer while taking all these variables and perhaps others into consideration. Complex stuff but we needn’t worry too much about it!

Quite so... I haven't worried about it at all....

Only GIG seems confused...

Still trying to come to terms with him going faster than the speed of sound and his microphone not catching what he was saying because he was travelling beyond Mach I. Amazing!

Oh yeah - from the guy whose explanation why Felix couldn't be heard was because:

there was no atmosphere that could have supported 'sound'.

But I didn't say just that did I???

Put the whole quote in one of your replies and reveal it in its full and proper context (which you still can't understand I expect)...

Perhaps if you read it very carefully and s l o w l y (and run your finger across each word on the screen) you will see that it was NOTHING to do with being heard...

I dare you! no, I double dare you!

The truth is that YOU are the only one that thought he couldn't be heard because he was travelling faster than the speed of sound!

As anybody that read the whole thread can see....

Oh, and I've flown on Concorde at twice the speed of sound and I can absolutely guarantee that there is no issue with hearing your fellow passengers....

[cyprusgrump]

i have a question for the real physicists.....when driving up a mountain why would an empty plastic water bottle with cap on it crumble?

It shouldn't...

But, if the cap was put on at the bottom of the mountain when it was very hot...

... then as the temperature decreased going up the mountain it could perhaps have a greater effect than the decrease in air pressure...

[GreekIslandGirl]

Seriously, the jump began in the stratosphere (20..50km) and he then went through the troposphere (6..20km) so given that he encountered variable air density, temperature, and pressure, his speed would’ve had to be constantly calculated by a computer while taking all these variables and perhaps others into consideration. Complex stuff but we needn’t worry too much about it!

Quite so... I haven't worried about it at all....

Only GIG seems confused...

Still trying to come to terms with him going faster than the speed of sound and his microphone not catching what he was saying because he was travelling beyond Mach I. Amazing!

Oh yeah - from the guy whose explanation why Felix couldn't be heard was because:

there was no atmosphere that could have supported 'sound'.

But I didn't say just that did I???

Put the whole quote in one of your replies and reveal it in its full and proper context (which you still can't understand I expect)...

Perhaps if you read it very carefully and s l o w l y (and run your finger across each word on the screen) you will see that it was NOTHING to do with being heard...

I dare you! no, I double dare you!

The truth is that YOU are the only one that thought he couldn't be heard because he was travelling faster than the speed of sound!

As anybody that read the whole thread can see....

Oh, and I've flown on Concorde at twice the speed of sound and I can absolutely guarantee that there is no issue with hearing your fellow passengers....

If you read back - you tried very hard to seriously answer a sarcastic bold comment which should have been obvious from the "Amazing!" But you had to jump in and show off you read a lot about skydiving .... Amazing!

(BTW - you did get confused by the internal and external environment of the helmet )

[bill cobbett]

i have a question for the real physicists.....when driving up a mountain why would an empty plastic water bottle with cap on it crumble?

It shouldn't...

But, if the cap was put on at the bottom of the mountain when it was very hot...

... then as the temperature decreased going up the mountain it could perhaps have a greater effect than the decrease in air pressure...

Ah... temperature... must have a think... ( < me thinking)

[cyprusgrump]

Seriously, the jump began in the stratosphere (20..50km) and he then went through the troposphere (6..20km) so given that he encountered variable air density, temperature, and pressure, his speed would’ve had to be constantly calculated by a computer while taking all these variables and perhaps others into consideration. Complex stuff but we needn’t worry too much about it!

Quite so... I haven't worried about it at all....

Only GIG seems confused...

Still trying to come to terms with him going faster than the speed of sound and his microphone not catching what he was saying because he was travelling beyond Mach I. Amazing!

Oh yeah - from the guy whose explanation why Felix couldn't be heard was because:

there was no atmosphere that could have supported 'sound'.

But I didn't say just that did I???

Put the whole quote in one of your replies and reveal it in its full and proper context (which you still can't understand I expect)...

Perhaps if you read it very carefully and s l o w l y (and run your finger across each word on the screen) you will see that it was NOTHING to do with being heard...

I dare you! no, I double dare you!

The truth is that YOU are the only one that thought he couldn't be heard because he was travelling faster than the speed of sound!

As anybody that read the whole thread can see....

Oh, and I've flown on Concorde at twice the speed of sound and I can absolutely guarantee that there is no issue with hearing your fellow passengers....

If you read back - you tried very hard to seriously answer a sarcastic bold comment which should have been obvious from the "Amazing!" But you had to jump in and show off you read a lot about skydiving .... Amazing!

(BTW - you did get confused by the internal and external environment of the helmet )

No I didn't - that was you that got confused.... Read back and see...

I'm not surprised however that after pages of trying to defend the indefensible you now claim that it was a sarcastic comment in order to save face...

Keep going if you wish - your ignorance and confusion are up there for everybody to see each time you bump the thread...

[Get Real!]

As the self appointed arbiter of this debate I hereby declare it a…

DRAW!!!

NB: For the sake of our brain cells which have flown through the stratosphere at mach IV.

[GreekIslandGirl]

Oh yeah - from the guy whose explanation why Felix couldn't be heard was because:

there was no atmosphere that could have supported 'sound'.

But I didn't say just that did I???

Put the whole quote in one of your replies and reveal it in its full and proper context (which you still can't understand I expect)...

Perhaps if you read it very carefully and s l o w l y (and run your finger across each word on the screen) you will see that it was NOTHING to do with being heard...

I dare you! no, I double dare you!

The truth is that YOU are the only one that thought he couldn't be heard because he was travelling faster than the speed of sound!

As anybody that read the whole thread can see....

Oh, and I've flown on Concorde at twice the speed of sound and I can absolutely guarantee that there is no issue with hearing your fellow passengers....

If you read back - you tried very hard to seriously answer a sarcastic bold comment which should have been obvious from the "Amazing!" But you had to jump in and show off you read a lot about skydiving .... Amazing!

(BTW - you did get confused by the internal and external environment of the helmet )

No I didn't - that was you that got confused.... Read back and see...

I'm not surprised however that after pages of trying to defend the indefensible you now claim that it was a sarcastic comment in order to save face...

Keep going if you wish - your ignorance and confusion are up there for everybody to see each time you bump the thread...

When you failed to get it by the time I said "Silly!" to your Concorde comment I knew you needed to show off to someone.

But, yes, you did seem to think he was speaking into a vacuum (as I am right now!)

[cyprusgrump]

(The system restricts the number of embedded quotes so I have started a new one...)

But no...

Read the thread...

It was only YOU that was obsessed by the vacuum...

It was only YOU that thought it would be impossible to hear somebody if they were travelling faster than the speed of sound...

It was only YOU that confused attitude and altitude...

It was only YOU that kept posting LONG after your credibility has been exhausted...

As I said, keep clutching at straws if you wish....

[GreekIslandGirl]

(The system restricts the number of embedded quotes so I have started a new one...)

But no...

Read the thread...

It was only YOU that was obsessed by the vacuum...

It was only YOU that thought it would be impossible to hear somebody if they were travelling faster than the speed of sound...

It was only YOU that confused attitude and altitude...

It was only YOU that kept posting LONG after your credibility has been exhausted...

As I said, keep clutching at straws if you wish....

On the contrary it was once you started off on sound travelling in a vacuum that I got 'obsessed' with trying to explain to you that he could only be speaking from within his helmet which was full of oxygen - yes, please do go back (in time!).

... he was travelling so fast because he was in a virtual vacuum where there can be no sound anyway.....

You mean "no friction" from air resistance to affect his speed, right? Because as far as the sound is concerned, he wasn't in a vacuum because he had a helmet on for oxygen!

And I never said anything was "impossible"!

[kurupetos]

i have a question for the real physicists.....when driving up a mountain why would an empty plastic water bottle with cap on it crumble?

It shouldn't...

But, if the cap was put on at the bottom of the mountain when it was very hot...

... then as the temperature decreased going up the mountain it could perhaps have a greater effect than the decrease in air pressure...

Ah... temperature... must have a think... ( < me thinking)

It's not the temperature. As I wrote above it's the pressure/density change. The difference in pressure between the air trapped inside the bottle and the surroundings causes a force interaction, which in turn causes the crumble.