Is PADI bad?

[sheck33]

CincyBengalsFan once bubbled...


Surely to goodness they taught the laws of physics correctly......

I can remember that in my CMAS instruction manual it stated that molecules/atoms completely stop moving at absolute zero (0 Kelvin, -273 C). While this piece of information is absolutely irrelevant to diving it was still incorrect. So always beware of mistakes

 

[CincyBengalsFan]

sheck33 once bubbled...


I can remember that in my CMAS instruction manual it stated that molecules/atoms completely stop moving at absolute zero (0 Kelvin, -273 C). While this piece of information is absolutely irrelevant to diving it was still incorrect. So always beware of mistakes

That is news to me. I thought absolute zero Kelvin everything came to a stop.

 

[O-ring]

CincyBengalsFan once bubbled...


That is news to me. I thought absolute zero Kelvin everything came to a stop.

I thought he was the kid from that comic strip with the stuffed tiger...

 

[sheck33]

CincyBengalsFan once bubbled...


That is news to me. I thought absolute zero Kelvin everything came to a stop.

Nope, things do not come to a complete stop.
Heisenberg's uncertainty principle states that the product of the uncertainties in the measurement momentum and position is equal or larger than a fixed quantity.

dp x dx >= Constant

If all motion were to completely cease at 0 K then dp would be zero and we would know EXACTLY were the particle is, quantum mechanics does not allow this. This by the way implies the universe is not deterministic.

Ok, i am sure you were just dying to know this

back to diving now....

PS: yea maybe i like physics......but just a little bit...:mean:

 

[CincyBengalsFan]

sheck33 once bubbled...



Nope, things do not come to a complete stop.
Heisenberg's uncertainty principle states that the product of the uncertainties in the measurement momentum and position is equal or larger than a fixed quantity.

dp x dx >= Constant

If all motion were to completely cease at 0 K then dp would be zero and we would know EXACTLY were the particle is, quantum mechanics does not allow this. This by the way implies the universe is not deterministic.

Ok, i am sure you were just dying to know this

back to diving now....


PS: yea maybe i like physics......but just a little bit...:mean:

I think it's pretty cool.

 

[Big-t-2538]

sheck33 once bubbled...



Nope, things do not come to a complete stop.
Heisenberg's uncertainty principle states that the product of the uncertainties in the measurement momentum and position is equal or larger than a fixed quantity.

dp x dx >= Constant

If all motion were to completely cease at 0 K then dp would be zero and we would know EXACTLY were the particle is, quantum mechanics does not allow this. This by the way implies the universe is not deterministic.


PS: yea maybe i like physics......but just a little bit...:mean:

I am now thinking about this equation not being equal to zero....

Let's assume we are talking about all objects in the universe.....

momentum is comprised of mass and velocity. since all objects or particles have mass, we know mass cannot be zero. Since velocity is a derivative of position, the only way this equation can be zero is iff (if and only if for those who have never seen the double f notation before) all objects have a position vector at absolute zero that results in a zero component for velocity...thus we would know the exact position of every object in the universe.

hmmm...so it seems to me that everything might stop moving at absolute zero, but we would know where everything is....but since we have never seen absolute zero, we cannot say for sure what happens there...thus the uncertainty principle???? am I way off here?

 

[Big-t-2538]

CincyBengalsFan once bubbled...


I think it's pretty cool.

you too are a freekin geek

 

[sheck33]

Big-t-2538 once bubbled...


I am now thinking about this equation not being equal to zero....

Let's assume we are talking about all objects in the universe.....

momentum is comprised of mass and velocity. since all objects or particles have mass, we know mass cannot be zero. Since velocity is a derivative of position, the only way this equation can be zero is iff (if and only if for those who have never seen the double f notation before) all objects have a position vector at absolute zero that results in a zero component for velocity...thus we would know the exact position of every object in the universe.

hmmm...so it seems to me that everything might stop moving at absolute zero, but we would know where everything is....but since we have never seen absolute zero, we cannot say for sure what happens there...thus the uncertainty principle???? am I way off here?

All this is a little off topic really...

But..it is a little more complex then this

Momentum p is compromised of a particle's rest mass, it's total energy and the speed of light, therefor a particle's total mass depends on it's velocity believe it or not.

photons actually have a rest mass that is zero. However their momentum is not zero.

Heisenberg's equation dp x dx (or equivalently dE x dt) cannot be zero, i'd have to look up the derivation of this result. Experiment also supports this theoretical result. We do not have to get to absolute zero to be able to predict what has to happen there.

Heisenberg's uncertainty principle has some very important consequences, the universe is not a deterministic place, in other words we can never completely predict what is going to happen.
Also, all we can predict are probabilities, we cannot say that we are going to find a certain particle at a certain place, all we can do is calculate the probability of finding a particle in a certain amount of space.

to put Heisenberg's principle in other words, the better a know an object's velocity the less i can know about where in space it is located and the better i know where it is located the less i know about it's velocity.....quantum mechanics is very counter intuitive

ok i'll stop as this has nothing to do with diving anymore....

 

[dolphinJS]

O-ring once bubbled...

Who knows what else they left out if they are teaching the wrong standards..

Your instructor should have pointed out about keeping current with the training bulletins. Standards do change, as instructors we're responsible for keeping ourseleves up to date.

 

[Fat_Tony]

I hope its good. I just signed up for a course.