Recent content by AC130Nav

Thanks, Bandersnatch. That does look like the state-of-the-art answer.

I did not doubt that the frequency of light could be changed by the "expansion" of the universe, which even allows for observed speed of separation of distant object greater than c. My point was that the Doppler theory proposes a frequency shift based on differing the speed of the wave by a...

I'd like a little clarification. I know the redshift caused by the constantly redefined distances in our part of space cause the redshift. That's OK. I believe, however, that I've heard of redshifting of say the stars on the receding edge of a galaxy. The problem is that the speed of light...

Did you ever draw it?

Why is no one helping with this? I'm about to give him the answer as I think it is--it's really not something I do day-to-day but IAW to site I posted previously. We are surpassing Winston Chruchill adage here "The Americans and the British are a single people divided only by a common language."

You were closer in your original post.

I did not say the force was wrong but you changed it; moreover, you still don't have the uncertainty right as I understand it. I guess I'm not helping.

Newton might have thought things in this order: mass is a very old concept (albeit as weight); acceleration is a newer concept related to speed; force is ill-defined but must be related to the other two in such an experiment as you describe. The experiment proves the relationship.

Why can't you use F=ma? The weight exerts a force at the pulley equal to F=mg (where g is the a due to gravity), and the cart accelerates at a = F/m (same F, without considering friction).

According to what I read: http://spiff.rit.edu/classes/phys273/uncert/uncert.html you have to multiply the value for velocity by two because it's squared.

But, if instead, we make fewer assumptions and take just the original formula at face value |5x-2| = 6x-12 obviously means 0\leq 6x-12 by the definition of absolute values. This means x\geq 2. This eliminates the same false answer for the OP. Is this incorrect? And what relation do the...

Your first job is to compute the circumference given a radius of 250000. Your second is to compute a new radius given that circumference plus 3. I'll leave the third step to you.

Since the two items noted are not formulae, as I understand it they can't intersect. What did you really mean? Are the values equal?

I don't see all veiwpoints represented yet. I see an entrenched viewpoint that the Universe is expanding. Let's call that the "flat-earther" viewpoint in that it believes what we can see is all there is. I see creationists--I won't even comment on them except to note that the Big Bangers...

Centripetal "force" in all cases is simply a greater gravity well (which is admitedly a force) or the resistance of deformation as in the case of a centrifuge or a sci-fi space station. Whoever invented the term (I won't bother to look it up), invited misunderstandings such as this one.