Why do circuit breakers go up for on and down for off?...

[Fredxx]

On 21/06/2023 10:14, jon wrote:

On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a crossing
but there are a lot of them. Let\'s say 30 for the sake of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a bit
of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.

 

[jon]

On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.

Inertia controls the rate of acceleration of a mass due to gravity, that\'s
why everything falls at the same rate in a vacuum.

 

[Max Demian]

On 21/06/2023 17:05, The Natural Philosopher wrote:

On 21/06/2023 10:14, jon wrote:

Momentum not Inertia.

Same thing

A massy object has inertia whether it\'s moving or not. It only has
momentum if it\'s moving.

--
Max Demian

 

[Fredxx]

On 21/06/2023 18:44, jon wrote:

On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity, that\'s
why everything falls at the same rate in a vacuum.

Sorry, but gravity really has nothing to do with inertia.

https://en.wikipedia.org/wiki/Inertia
Inertia is the idea that an object will continue its current motion
until some force causes its speed or direction to change.

or:
https://en.wikipedia.org/wiki/Newton%27s_laws_of_motion#First

 

[Anthony William Sloman]

On Thursday, June 22, 2023 at 5:02:42 AM UTC+10, Fredxx wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:
On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:
On 2023-06-21, Commander Kinsey <C...@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R. <robin_...@es.invalid> wrote:
On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:
On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bow...@montana.com> wrote:
On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:

<snip>

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a scalar, much like velocity and speed.

TNP is wrong - as he usually is. Momentum is the product of mass and velocity. Speed is merely velocity in the direction of motion - you\'ve chosen to ignore the direction of motion, rather than to throw away an independent variable.

Inertia controls the rate of acceleration of a mass due to gravity, that\'s why everything falls at the same rate in a vacuum.

Sorry, but gravity really has nothing to do with inertia.

https://en.wikipedia.org/wiki/Inertia
Inertia is the idea that an object will continue its current motion until some force causes its speed or direction to change.

or:
https://en.wikipedia.org/wiki/Newton%27s_laws_of_motion#First

It is interesting that mass - as measured as inertia - is the same as gravitational mass

https://en.wikipedia.org/wiki/E%C3%B6tv%C3%B6s_experiment

The concepts are clearly closely related and general relativity makes sense of that, but we still have to couple general relativity with quantum theory.

--
Bill Sloman, Sydney

 

[The Natural Philosopher]

On 21/06/2023 18:44, jon wrote:

On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity, that\'s
why everything falls at the same rate in a vacuum.

Momentums is the technical scientific term for the common or garden term
\'inertia\' - the natural tendency for stuff to keep moving at a constant
speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

--
“The ultimate result of shielding men from the effects of folly is to
fill the world with fools.”

Herbert Spencer

 

[The Natural Philosopher]

On 21/06/2023 19:45, Max Demian wrote:

On 21/06/2023 17:05, The Natural Philosopher wrote:
On 21/06/2023 10:14, jon wrote:

Momentum not Inertia.

Same thing

A massy object has inertia whether it\'s moving or not. It only has
momentum if it\'s moving.

Moving relative to what?

--
Climate is what you expect but weather is what you get.
Mark Twain

 

[Jeff Gaines]

On 22/06/2023 in message <u70s65$37pg0$1@dont-email.me> The Natural
Philosopher wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity, that\'s
why everything falls at the same rate in a vacuum.
Momentums is the technical scientific term for the common or garden term
\'inertia\' - the natural tendency for stuff to keep moving at a constant
speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

There\'s a description of the difference here:

https://byjus.com/physics/difference-between-momentum-and-inertia/#:~:text=Momentum%20is%20a%20vector%20quantity,any%20change%20in%20its%20velocity.

--
Jeff Gaines Dorset UK
This is as bad as it can get, but don\'t bet on it

 

[Anthony William Sloman]

On Thursday, June 22, 2023 at 5:11:10 PM UTC+10, The Natural Philosopher wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:
On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:
On 2023-06-21, Commander Kinsey <C...@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_...@es.invalid> wrote:
On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:
On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bow...@montana.com> wrote:
On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:

<snip>

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a scalar, much like velocity and speed.

Inertia controls the rate of acceleration of a mass due to gravity, that\'s why everything falls at the same rate in a vacuum.

Momentums is the technical scientific term for the common or garden term \'inertia\' - the natural tendency for stuff to keep moving at a constant speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary people call \'inertia\' .

But you don\'t know what you are talking about.

\"Momentum\" is the product of velocity - a vector - and mass or inertia which is a scalar.

The fact that gravitational mass and inertial mass are exactly the same is interesting

https://en.wikipedia.org/wiki/E%C3%B6tv%C3%B6s_experiment

but it\'s not the idea you seem to have in what passes for your mind.

--
Bill Sloman, Sydney

 

[The Natural Philosopher]

On 22/06/2023 08:22, Jeff Gaines wrote:

On 22/06/2023 in message <u70s65$37pg0$1@dont-email.me> The Natural
Philosopher wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman
bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200
tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity,
that\'s
why everything falls at the same rate in a vacuum.
Momentums is the technical scientific term for the common or garden
term \'inertia\' - the natural tendency for stuff to keep moving at a
constant speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

There\'s a description of the difference here:

https://byjus.com/physics/difference-between-momentum-and-inertia/#:~:text=Momentum%20is%20a%20vector%20quantity,any%20change%20in%20its%20velocity.

With respect that is mostly bollocks. And doesn\'t take into account the
inertia of bureaucracy or the inertia of a projectile hitting a tank.

Inertia is a common usage term. Momentums is technical. And as I pointed
out, all motion is relative, so your appeal to authority fails because
there is no such thing as \'an object at rest\' or \'in constant motion\'
unless you define a frame of interital. reference.



--
Religion is regarded by the common people as true, by the wise as
foolish, and by the rulers as useful.

(Seneca the Younger, 65 AD)

 

[Jeff Gaines]

On 22/06/2023 in message <u70tk1$37v7o$1@dont-email.me> The Natural
Philosopher wrote:

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

There\'s a description of the difference here:

https://byjus.com/physics/difference-between-momentum-and-inertia/#:~:text=Momentum%20is%20a%20vector%20quantity,any%20change%20in%20its%20velocity.

With respect that is mostly bollocks. And doesn\'t take into account the
inertia of bureaucracy or the inertia of a projectile hitting a tank.

Inertia is a common usage term. Momentums is technical. And as I pointed
out, all motion is relative, so your appeal to authority fails because
there is no such thing as \'an object at rest\' or \'in constant motion\'
unless you define a frame of interital. reference.

It makes sense to me, perhaps you could give a link to something similar
from a respected body?

--
Jeff Gaines Dorset UK
The world will not be destroyed by those who do evil but by those who
watch them without doing anything. (Albert Einstein)

 

[jon]

On Thu, 22 Jun 2023 08:11:21 +0100, The Natural Philosopher wrote:

On 21/06/2023 19:45, Max Demian wrote:
On 21/06/2023 17:05, The Natural Philosopher wrote:
On 21/06/2023 10:14, jon wrote:

Momentum not Inertia.

Same thing

A massy object has inertia whether it\'s moving or not. It only has
momentum if it\'s moving.

Moving relative to what?

Time

 

[Anthony William Sloman]

On Thursday, June 22, 2023 at 5:35:38 PM UTC+10, The Natural Philosopher wrote:

On 22/06/2023 08:22, Jeff Gaines wrote:
On 22/06/2023 in message <u70s65$37pg0$1...@dont-email.me> The Natural Philosopher wrote:
On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:
On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:
On 2023-06-21, Commander Kinsey <C...@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R. <robin_...@es.invalid> wrote:
On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:
On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bow...@montana..com> wrote:
On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:

<snip>

There\'s a description of the difference here:

https://byjus.com/physics/difference-between-momentum-and-inertia/#:~:text=Momentum%20is%20a%20vector%20quantity,any%20change%20in%20its%20velocity.

With respect that is mostly bollocks. And doesn\'t take into account the inertia of bureaucracy or the inertia of a projectile hitting a tank.

That is figurative language so it\'s irrelevant here.

> Inertia is a common usage term. Momentums is technical. And as I pointed out, all motion is relative, so your appeal to authority fails because there is no such thing as \'an object at rest\' or \'in constant motion\' unless you define a frame of inertial reference.

Empty pontification. Inertia is just as much a technical term as momentum (which is also used in figurative speech). Claiming that all motion is relative is a truism - if there wasn\'t something for an object to move in relation to, the motion would undetectable.

Humpty-dumnpty told us that a word meant what he intended it to mean, but he was comic invention. You are trying on the same trick, and I\'m happy to laugh at you.

--
Bill Sloman, Sydney

 

[Bing AI]

On 22/06/2023 08:11, The Natural Philosopher wrote:

> Moving relative to what?

You are correct that all motion has to be relative to something. In this
case, the object\'s motion is relative to the observer. The momentum of
an object is its mass times its velocity. Inertia is the property of
matter that resists changes in motion. It is proportional to mass and
independent of velocity. So, a massy object has inertia whether it\'s
moving or not. It only has momentum if it\'s moving relative to an
observer ¹².

I hope that helps! Let me know if you have any other questions.

Source: Conversation with Bing, 22/06/2023
(1) Difference Between Momentum and Inertia - Collegedunia.
https://collegedunia.com/exams/difference-between-momentum-and-inertia-physics-articleid-3934.
(2) Difference Between Momentum and Inertia - Momentum vs Inertia -
BYJU\'S. https://byjus.com/physics/difference-between-momentum-and-inertia/.
(3) Difference Between Momentum and Inertia - Vedantu.
https://www.vedantu.com/physics/difference-between-momentum-and-inertia.

--
Bing AI

 

[John Larkin]

On Thu, 22 Jun 2023 08:11:00 +0100, The Natural Philosopher
<tnp@invalid.invalid> wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, ? Mighty Wannabe ? wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity, that\'s
why everything falls at the same rate in a vacuum.
Momentums is the technical scientific term for the common or garden term
\'inertia\' - the natural tendency for stuff to keep moving at a constant
speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

Inertia has units of mass. Momentum is mass times velocity.

Mass does not have a vector.

 

[John Larkin]

On Thu, 22 Jun 2023 08:35:29 +0100, The Natural Philosopher
<tnp@invalid.invalid> wrote:

On 22/06/2023 08:22, Jeff Gaines wrote:
On 22/06/2023 in message <u70s65$37pg0$1@dont-email.me> The Natural
Philosopher wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, ? Mighty Wannabe ? wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman
bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200
tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity,
that\'s
why everything falls at the same rate in a vacuum.
Momentums is the technical scientific term for the common or garden
term \'inertia\' - the natural tendency for stuff to keep moving at a
constant speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

There\'s a description of the difference here:

https://byjus.com/physics/difference-between-momentum-and-inertia/#:~:text=Momentum%20is%20a%20vector%20quantity,any%20change%20in%20its%20velocity.

With respect that is mostly bollocks. And doesn\'t take into account the
inertia of bureaucracy or the inertia of a projectile hitting a tank.

Inertia is a common usage term. Momentums is technical. And as I pointed
out, all motion is relative, so your appeal to authority fails because
there is no such thing as \'an object at rest\' or \'in constant motion\'
unless you define a frame of interital. reference.

I\'m sure glad that you don\'t design electronics.

 

[Anthony William Sloman]

On Friday, June 23, 2023 at 12:10:24 AM UTC+10, John Larkin wrote:

On Thu, 22 Jun 2023 08:35:29 +0100, The Natural Philosopher <t...@invalid..invalid> wrote:
On 22/06/2023 08:22, Jeff Gaines wrote:
On 22/06/2023 in message <u70s65$37pg0$1...@dont-email.me> The Natural Philosopher wrote:
On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:
On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:
On 2023-06-21, Commander Kinsey <C...@nospam.com> wrote:
On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, ? Mighty Wannabe ? wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:
On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bow...@montana.com> wrote:
On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:

<snip>

> I\'m sure glad that you don\'t design electronics.

John Larkin\'s favourite put-down.

Of course in the thread \"Constant current to capacifor / rising voltage\" he solemnly told us that \"A pure-silicon current mirror runs one transistor at 0.6ish volts and
low dissipation, and the other at whatever Vce and higher dissipation,so tight thermal coupling is mandatory.\"

He doesn\'t know that the Wilson current mirror

https://en.wikipedia.org/wiki/Wilson_current_mirror

was invented back in 1967 to solve that particular problem, or that anybody who knows about circuit design knows about that particular solution.

I posted that link in the fourth post in the thread, but John only reads posts that he can rely on to flatter him.

Thermal dissipation isn\'t the only problem it solves - as Phil Hobbs explicitly pointed out in the nineth post in the thread, the Early effect also messes up the two-transistor current mirror but not the Wilson current mirror..

--
Bill Sloman, Sydney

 

[The Natural Philosopher]

On 22/06/2023 15:08, John Larkin wrote:

On Thu, 22 Jun 2023 08:11:00 +0100, The Natural Philosopher
tnp@invalid.invalid> wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, ? Mighty Wannabe ? wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity, that\'s
why everything falls at the same rate in a vacuum.
Momentums is the technical scientific term for the common or garden term
\'inertia\' - the natural tendency for stuff to keep moving at a constant
speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

Inertia has units of mass. Momentum is mass times velocity.

Mass does not have a vector.

Inertia has no units.

--
You can get much farther with a kind word and a gun than you can with a
kind word alone.

Al Capone

 

[The Natural Philosopher]

On 22/06/2023 15:09, John Larkin wrote:

On Thu, 22 Jun 2023 08:35:29 +0100, The Natural Philosopher
tnp@invalid.invalid> wrote:

On 22/06/2023 08:22, Jeff Gaines wrote:
On 22/06/2023 in message <u70s65$37pg0$1@dont-email.me> The Natural
Philosopher wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <CK1@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, ? Mighty Wannabe ? wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman
bowman@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200
tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity,
that\'s
why everything falls at the same rate in a vacuum.
Momentums is the technical scientific term for the common or garden
term \'inertia\' - the natural tendency for stuff to keep moving at a
constant speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

There\'s a description of the difference here:

https://byjus.com/physics/difference-between-momentum-and-inertia/#:~:text=Momentum%20is%20a%20vector%20quantity,any%20change%20in%20its%20velocity.

With respect that is mostly bollocks. And doesn\'t take into account the
inertia of bureaucracy or the inertia of a projectile hitting a tank.

Inertia is a common usage term. Momentums is technical. And as I pointed
out, all motion is relative, so your appeal to authority fails because
there is no such thing as \'an object at rest\' or \'in constant motion\'
unless you define a frame of interital. reference.

I\'m sure glad that you don\'t design electronics.

Oh, but I do.
Or did

--
You can get much farther with a kind word and a gun than you can with a
kind word alone.

Al Capone

 

[Anthony William Sloman]

On Friday, June 23, 2023 at 1:17:50 AM UTC+10, The Natural Philosopher wrote:

On 22/06/2023 15:08, John Larkin wrote:
On Thu, 22 Jun 2023 08:11:00 +0100, The Natural Philosopher
t...@invalid.invalid> wrote:

On 21/06/2023 18:44, jon wrote:
On Wed, 21 Jun 2023 17:16:01 +0100, Fredxx wrote:

On 21/06/2023 10:14, jon wrote:
On Wed, 21 Jun 2023 06:57:13 +0000, Jasen Betts wrote:

On 2023-06-21, Commander Kinsey <C...@nospam.com> wrote:
On Wed, 10 May 2023 22:04:54 +0100, Carlos E.R.
robin_...@es.invalid> wrote:

On 2023-05-10 22:31, Bob F wrote:
On 3/12/2023 7:43 PM, ? Mighty Wannabe ? wrote:
rbowman wrote on 3/12/2023 10:05 PM:
On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:

On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bow...@montana.com
wrote:

On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:


Why were they never made of something more grippy than highly
polished steel?
https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
Should be used on all tracks, then perhaps trains could stop in
the distance my car is required to by law.
Do the math. A fully laden coal car weighs about 140 tons. I\'ve
never been bored enough to count cars when I stopped at a
crossing but there are a lot of them. Let\'s say 30 for the sake
of argument,
4200 tons plus the weight of the engines. Let\'s say 4 at 200 tons
each. So, roughly 5000 tons traveling at 50 mph. That\'s quite a
bit of kinetic energy to dump in 300\'.
I can hear snapping axles and see flying wheels.


The wheels and the rails are steel. A train can never have enough
friction to stop at a short distance. The brakes can lock all the
wheels but the train will still move forward due to inertia.

Momentum not Inertia.

As TNP has said they are virtually the same, one is vector and one is a
scalar, much like velocity and speed.


Inertia controls the rate of acceleration of a mass due to gravity, that\'s
why everything falls at the same rate in a vacuum.
Momentums is the technical scientific term for the common or garden term
\'inertia\' - the natural tendency for stuff to keep moving at a constant
speed and resits changes to it.
Has has been pointed out already momentum is technically a vector. But
people don\'t think vector, much, when they use the word \'inertia\'.

For me, momentum is the technical refined description of what ordinary
people call \'inertia\'

Inertia has units of mass. Momentum is mass times velocity.

Mass does not have a vector.

Inertia has no units.

Sure it has. It\'s just mass, and kilograms work fine.

--
Bill Sloman, Sydney