Why do not we feel the world is spinning...?

Quote from: ausGeoff on October 25, 2017, 09:00:14 AM

Quote from: John Davis on September 13, 2017, 11:57:32 AM

In so much as Foucault pendulums are accurate, they are powered by magnets.

No.  They're not "powered" by magnets LOL.  Do you even know the physics behind their principals of operation—simply put, they repeatedly convert kinetic energy into potential energy.  And of course the earliest pendulums—and still many today—don't utilise any magnets, but have to be periodically "restarted" by hand.

Magnets have no "Power" now?  Are you going to reinvent all of physics, or just magnets?

Power=force*velocity. So unless your magnet is moving it has no power.

Power=force*velocity. So unless your magnet is moving it has no power.

But power also = current * voltage. Power does not require velocity by definition.

Quote from: ausGeoff on October 25, 2017, 09:00:14 AM

Quote from: John Davis on September 13, 2017, 11:57:32 AM

In so much as Foucault pendulums are accurate, they are powered by magnets.

No.  They're not "powered" by magnets LOL.  Do you even know the physics behind their principals of operation—simply put, they repeatedly convert kinetic energy into potential energy.  And of course the earliest pendulums—and still many today—don't utilise any magnets, but have to be periodically "restarted" by hand.

Magnets have no "Power" now?  Are you going to reinvent all of physics, or just magnets?

Power is the time rate or change of work or energy transfer so no, magnets don't have power?  If you want to magnetism as a force, an electromagnetic tensor, then you would be correct. 

But no, magnetism is not power.

Mike

Quote from: jroa on October 25, 2017, 09:08:50 AM

Quote from: ausGeoff on October 25, 2017, 09:00:14 AM

Quote from: John Davis on September 13, 2017, 11:57:32 AM

In so much as Foucault pendulums are accurate, they are powered by magnets.

No.  They're not "powered" by magnets LOL.  Do you even know the physics behind their principals of operation—simply put, they repeatedly convert kinetic energy into potential energy.  And of course the earliest pendulums—and still many today—don't utilise any magnets, but have to be periodically "restarted" by hand.

Magnets have no "Power" now?  Are you going to reinvent all of physics, or just magnets?

Power=force*velocity. So unless your magnet is moving it has no power.

Incorrect.  The correct equation should be, power=work/time, and since work=force*distance, then, power=force*distance/time.  And, while speed=distance/time, speed does not take into consideration the direction, which is the difference between speed and velocity.  So, unless you can show me how vector is involved, you will simply be incorrect. 

Quote from: jroa on October 25, 2017, 10:30:16 AM

Since an aeroplane is constantly changing directions on a round Earth, and so are you and I, I don't see the point in your post.

Technically-speaking, you're correct jroa, but not for the reasons you think.  Commercial aircraft normally follow a "great circle" or orthodrome course due to... wait for it... the sphericity of the planet.  And the fact that they do change course slightly but constantly proves that the earth is NOT flat.  Oh dear.   

An aircraft taking off from (say) 50 03 59N, 005 42 53W and flying to 58 38 38N, 003 04 12W would have an initial bearing of 009° 07' 11", and a final landing bearing of 011° 16' 31" for example.  You can check this out using the haversine formula—which relates to the sides and angles of spherical triangles—if you don't believe this.

Thanks for admitting that we should be constantly accelerating on a round Earth and should feel it. 

Quote from: Empirical on October 28, 2017, 01:33:17 PM

Power=force*velocity. So unless your magnet is moving it has no power.

But power also = current * voltage. Power does not require velocity by definition.

Magnets are used to induce current all the time, and voltage comes from the impedance of current flow.  It is like you are trying to prove my point for me.   

Quote from: jroa on October 25, 2017, 09:08:50 AM

Quote from: ausGeoff on October 25, 2017, 09:00:14 AM

Quote from: John Davis on September 13, 2017, 11:57:32 AM

In so much as Foucault pendulums are accurate, they are powered by magnets.

No.  They're not "powered" by magnets LOL.  Do you even know the physics behind their principals of operation—simply put, they repeatedly convert kinetic energy into potential energy.  And of course the earliest pendulums—and still many today—don't utilise any magnets, but have to be periodically "restarted" by hand.

Magnets have no "Power" now?  Are you going to reinvent all of physics, or just magnets?

Power is the time rate or change of work or energy transfer so no, magnets don't have power?  If you want to magnetism as a force, an electromagnetic tensor, then you would be correct. 

But no, magnetism is not power.

Mike

I have a magnet that has the "power" to lift around 50 lbs.  Checkmate. 

Quote from: kennykirklan on September 14, 2017, 03:56:05 AM

Quote from: jroa on September 13, 2017, 04:53:07 PM

Quote from: kennykirklan on September 13, 2017, 12:28:26 PM

Because it's not accelerating or decelerating.

If you are cruising on a plane and the conditions are calm, you can't feel yourself travelling at over 500mph. Need a change of speed to feel it.

No, you need a change of velocity to feel it.

Oops - yes

Oops -  yes........
And I thought jroa was a FE ? 
The earth is steadily rotating at the same speed-not changing velocity or accelerating as per the FE idea ?
Also consider the speed from an RPM stand point.
The earth rotates at 1 RPD  (One Revolution Per Day.)
1/60 minutes x 24 hours RPM = 0.000694 RPM
 The same as the speed of the hour hand on a 24 hour clock.

Tell me, how many miles over the course of an hour has your direction change on a spinning ball the size of an Earth? 

Quote from: ausGeoff on October 28, 2017, 11:10:51 AM

Quote from: jroa on October 25, 2017, 10:30:16 AM

Since an aeroplane is constantly changing directions on a round Earth, and so are you and I, I don't see the point in your post.

Technically-speaking, you're correct jroa, but not for the reasons you think.  Commercial aircraft normally follow a "great circle" or orthodrome course due to... wait for it... the sphericity of the planet.  And the fact that they do change course slightly but constantly proves that the earth is NOT flat.  Oh dear.   

An aircraft taking off from (say) 50 03 59N, 005 42 53W and flying to 58 38 38N, 003 04 12W would have an initial bearing of 009° 07' 11", and a final landing bearing of 011° 16' 31" for example.  You can check this out using the haversine formula—which relates to the sides and angles of spherical triangles—if you don't believe this.

Thanks for admitting that we should be constantly accelerating on a round Earth and should feel it.

I'm no science guy but I think you are right about us constantly accelerating but at one revolution per day it is far too slow to feel

Quote from: Googleotomy on September 14, 2017, 09:03:09 AM

Quote from: kennykirklan on September 14, 2017, 03:56:05 AM

Quote from: jroa on September 13, 2017, 04:53:07 PM

Quote from: kennykirklan on September 13, 2017, 12:28:26 PM

Because it's not accelerating or decelerating.

If you are cruising on a plane and the conditions are calm, you can't feel yourself travelling at over 500mph. Need a change of speed to feel it.

No, you need a change of velocity to feel it.

Oops - yes

Oops -  yes........
And I thought jroa was a FE ? 
The earth is steadily rotating at the same speed-not changing velocity or accelerating as per the FE idea ?
Also consider the speed from an RPM stand point.
The earth rotates at 1 RPD  (One Revolution Per Day.)
1/60 minutes x 24 hours RPM = 0.000694 RPM
 The same as the speed of the hour hand on a 24 hour clock.

Tell me, how many miles over the course of an hour has your direction change on a spinning ball the size of an Earth?

Relative to what fixed point?

Quote from: Dinosaur Neil on October 28, 2017, 03:07:02 PM

Quote from: Empirical on October 28, 2017, 01:33:17 PM

Power=force*velocity. So unless your magnet is moving it has no power.

But power also = current * voltage. Power does not require velocity by definition.

Magnets are used to induce current all the time, and voltage comes from the impedance of current flow.  It is like you are trying to prove my point for me.   

Are you thick? I was simply telling Empirical that his definition of power was overly restrictive. I don't give a monkey's fart that you think it "proves" your point, when your point has been rendered moot by the simple fact, already stated in this thread, that the Foucault pendulum is capable of operating entirely without the assistance of magnets for more than a couple of hours.
By the way, you need to tighten up your incorrect semanticisms regarding speed and velocity. Any object which has speed, has velocity. The directional vector is not always relevant and does not need to be factored into every equation, for example in measuring how much momentum an object in motion has. You simply need to know its speed OR its velocity, either will do. There are many situations where they are equivalent, just like mass and weight are in gravity of 1g.

Quote from: jroa on October 29, 2017, 06:30:31 AM

Quote from: Dinosaur Neil on October 28, 2017, 03:07:02 PM

Quote from: Empirical on October 28, 2017, 01:33:17 PM

Power=force*velocity. So unless your magnet is moving it has no power.

But power also = current * voltage. Power does not require velocity by definition.

Magnets are used to induce current all the time, and voltage comes from the impedance of current flow.  It is like you are trying to prove my point for me.   

Are you thick? I was simply telling Empirical that his definition of power was overly restrictive. I don't give a monkey's fart that you think it "proves" your point, when your point has been rendered moot by the simple fact, already stated in this thread, that the Foucault pendulum is capable of operating entirely without the assistance of magnets for more than a couple of hours.

Not to mention the fact that when drive magnets are used, they are round electromagnets so as not to influence the pendulum's direction of motion.

Quote from: MicroBeta on October 28, 2017, 03:55:07 PM

Quote from: jroa on October 25, 2017, 09:08:50 AM

Quote from: ausGeoff on October 25, 2017, 09:00:14 AM

Quote from: John Davis on September 13, 2017, 11:57:32 AM

In so much as Foucault pendulums are accurate, they are powered by magnets.

No.  They're not "powered" by magnets LOL.  Do you even know the physics behind their principals of operation—simply put, they repeatedly convert kinetic energy into potential energy.  And of course the earliest pendulums—and still many today—don't utilise any magnets, but have to be periodically "restarted" by hand.

Magnets have no "Power" now?  Are you going to reinvent all of physics, or just magnets?

Power is the time rate or change of work or energy transfer so no, magnets don't have power?  If you want to magnetism as a force, an electromagnetic tensor, then you would be correct. 

But no, magnetism is not power.

Mike

I have a magnet that has the "power" to lift around 50 lbs.  Checkmate.

You're funny.  It exerts a force.  It does not meet the definition of power.

Mike

I have a magnet that has the "power" to lift around 50 lbs.  Checkmate.

So your units of power are now pounds?

I thought that even those neanderthals that still used. foot, pound, second units knew that power was measured in horse-power or in foot-pounds per second.

Most people measure power in Watts.
But no person with any knowledge in the topic would claim that a magnet really has a certain "power".

Yes, I know you put quotes around your "power", just to try to be your usual smart Aleck.

A permanent magnet does have a little stored energy.
But even a if we have a Neodymium bar magnet with the measurements 150 mm x25 mm x  6 mm has stored energy of about 16.02 Joules.
It might run a 10 W lamp for 1.5 s. Big deal?