Talk Nerdy To Me!

It's not how it plays, but anything circular that spins from the center axis.  It must be traveling quicker to reach the same as the center of it... WandA I think understands what I mean, but it must be impossible to work out... Oh well, my geekyness here is done!

WandA - lol neither can I :D My folder for random stuff is called Misc :P

LoveHoney - Carly wrote:

Avrielle_Aniko wrote:

^^De-Bra'ers! Great! Lol!!

I love random conversations that borderline on geek.

Heres a nerdy question that I still can't work out the answer to.

If you take a record on a record player while its spinning, take a point form the outer edge of it, and a point from the inside label. As it spins the point on the outer edge need to spin faster than the point on the label as it has a greater circumference distance to cover in the same time as the point on the label. Therefore the whole record needs to be spinning faster and faster the further away from the center of the record!

I've confused so many people discussing this, including friends, family, uni graduates, teachers, children with wide imaginations, etc etc.. I still have no answer on how this can be true, but it must be true!!

I'm not even sure if I read this question right but if we're talking about LP records then the needle travels inwards, towards the centre in a spiral. It is fastest along the larger circumference, slowing down the closer it gets to the label.

It doesn't have a constant linear velocity like CD's, it changes, but it should only get faster if you're playing it in reverse and have a very funny record player!

yeah you'd probably find that the spacing of the engraved music increases as it gets closer to the label! or something like that as i wouldn't have thought the speed of the deck changes as the record plays? myabe not though, maybe the speed changes in relation to the angle of the arm...

ok i'm gonna have to look this one up lol!

Avrielle_Aniko wrote:

It's not how it plays, but anything circular that spins from the center axis.  It must be traveling quicker to reach the same as the center of it... WandA I think understands what I mean, but it must be impossible to work out... Oh well, my geekyness here is done!

Isn't it just like gears?

Where as the outside (bigger) circumference would make 1 revolution, the inside (smaller) circumference would make 2 in the same time?

So say 10 seconds of music makes up one revolution of the outside (bigger) circumference, that same 10 seconds of music would make up two revolutions of the inside (smaller) circumference?

"At least one manufacturer, Philips, produced records that played at a http://en.wikipedia.org/wiki/Constant_linear_velocity. As these were played from the inside to the outside, the rpm of the record reduced as reproduction progressed (as is also true of the modern http://en.wikipedia.org/wiki/Compact_Disc).http://en.wikipedia.org/wiki/Gramophone_record#cite_note-3 "

do i get any points for research?

LoveHoney - Carly wrote:

I'm not even sure if I read this question right but if we're talking about LP records then the needle travels inwards, towards the centre in a spiral. It is fastest along the larger circumference, slowing down the closer it gets to the label.

It doesn't have a constant linear velocity like CD's, it changes, but it should only get faster if you're playing it in reverse and have a very funny record player!

I think shes asking why the edge of an LP spins faster than the inside. What makes the outside edge move faster than the inside.

Theres a paradox like question based on this idea. If you spin a disc at the centre near to light speed, why won't the outside edge of the disc break light speed if a disc moves faster on the outside than inside.

I've give up for now.... lunch is calling!

LoveHoney - Carly wrote:

Avrielle_Aniko wrote:

It's not how it plays, but anything circular that spins from the center axis.  It must be traveling quicker to reach the same as the center of it... WandA I think understands what I mean, but it must be impossible to work out... Oh well, my geekyness here is done!

Isn't it just like gears?

Where as the outside (bigger) circumference would make 1 revolution, the inside (smaller) circumference would make 2 in the same time?

So say 10 seconds of music makes up one revolution of the outside (bigger) circumference, that same 10 seconds of music would make up two revolutions of the inside (smaller) circumference?

I though about gear ratios, spent a year doing the fuckers in tech....

but I got confused by the speed of light issue...

Oooo and also, as you said...

Where as the outside (bigger) circumference would make 1 revolution, the inside (smaller) circumference would make 2 in the same time?

If the inside circle is making 2 revs isnt that faster than the speed of 1?

I assumed the speed was the same before hand (how else would torque not rip apart your LPs!?) but now my head has left our phyiscal world

I never liked phyics.... except for metaphysical questions and random blackholiness and dimensions etc.. the stuff they don't know about, the stuff they guess about!

WandA wrote:

LoveHoney - Carly wrote:

Avrielle_Aniko wrote:

It's not how it plays, but anything circular that spins from the center axis.  It must be traveling quicker to reach the same as the center of it... WandA I think understands what I mean, but it must be impossible to work out... Oh well, my geekyness here is done!

Isn't it just like gears?

Where as the outside (bigger) circumference would make 1 revolution, the inside (smaller) circumference would make 2 in the same time?

So say 10 seconds of music makes up one revolution of the outside (bigger) circumference, that same 10 seconds of music would make up two revolutions of the inside (smaller) circumference?

I though about gear ratios, spent a year doing the fuckers in tech....

but I got confused by the speed of light issue...

It's the whole speed/distance conundrum.

On a record, the outside of the LP isn't travelling faster (ok, it does go a bit faster but this is due to the way LP's are built rather than a physical phenomenon and the difference of speed is marginal), the needle is just travelling a greater distance in one revolution.

In space... no one can hear you scream?

LoveHoney - Carly wrote:

It's the whole speed/distance conundrum.

On a record, the outside of the LP isn't travelling faster (ok, it does go a bit faster but this is due to the way LP's are built rather than a physical phenomenon and the difference of speed is marginal), the needle is just travelling a greater distance in one revolution.

In space... no one can hear you scream?

No one can hear you scream over the internet either....

O well... I'll live... No one uses LPs anymore anyway!

Using the equation s = d/t.

And using these hypothetical numbers:

Distance on the outer circumference = 60cm
Distance on the inner circumference = 30cm

Time for one outer circumference revolution to occur = 10 seconds
Time for one inner circumference revolution to occur = 5 seconds

In the case of the outside of the record 60cm/10secs= 6secs per cm.

In the case of the inside of the record 30cm/5secs = 6secs per cm.

Therefore the speed is the same, it is the distance within a specific amount of time which is different for each revolution.

Good job someone came up with MP3s.

LoveHoney - Carly wrote:

Using the equation s = d/t.

And using these hypothetical numbers:

Distance on the outer circumference = 60cm
Distance on the inner circumference = 30cm

Time for one outer circumference revolution to occur = 10 seconds
Time for one inner circumference revolution to occur = 5 seconds

In the case of the outside of the record 60cm/10secs= 6secs per cm.

In the case of the inside of the record 30cm/5secs = 6secs per cm.

Therefore the speed is the same, it is the distance within a specific amount of time which is different for each revolution.

No that isn't right. The time for a revolution of any point on the record is the same:

1. Take a record (or any other round flat object) now place some two little marks / plasticine people / whatever on the surface one near the middle one near the edge.

2. Rotate.

3. Observe.

However fast/slow you rotate both little people will make the same number of revolutions. They will be revolving for the same length of time but travelling different distances. To travel over differing distances with the same time duration means that 'objects' must be travelling at different speeds to each other.

Similar experiment can be done with people, a large field or other open space and rope (we all like rope don't we :) oh and maybe a whip (just in case):

1. Take a long rope.

2. Tie people to rope at intervals. But don't tie anyone too near one end as that is where you the Mistress/Master will be controlling the experiment from

3. Take hold of free end.

4. Stand in middle of open space and make people stand in one line stretching away from you. (Use whip if necessary)

5. Rotate on the spot.

Those people nearest you will walk in a small circle, those people furthest will run in a large circle and get all breathless and sweaty, Oooooh!

6. And finally chastise those who didn't behave......

(oh and btw hello all I'm new round here and a female geek with a degree in computer science)

LucretiaReflected wrote:

No that isn't right. The time for a revolution of any point on the record is the same:

1. Take a record (or any other round flat object) now place some two little marks / plasticine people / whatever on the surface one near the middle one near the edge.

2. Rotate.

3. Observe.

However fast/slow you rotate both little people will make the same number of revolutions. They will be revolving for the same length of time but travelling different distances. To travel over differing distances with the same time duration means that 'objects' must be travelling at different speeds to each other.

Similar experiment can be done with people, a large field or other open space and rope (we all like rope don't we :) oh and maybe a whip (just in case):

1. Take a long rope.

2. Tie people to rope at intervals. But don't tie anyone too near one end as that is where you the Mistress/Master will be controlling the experiment from

3. Take hold of free end.

4. Stand in middle of open space and make people stand in one line stretching away from you. (Use whip if necessary)

5. Rotate on the spot.

Those people nearest you will walk in a small circle, those people furthest will run in a large circle and get all breathless and sweaty, Oooooh!

6. And finally chastise those who didn't behave......

(oh and btw hello all I'm new round here and a female geek with a degree in computer science)

I have to admit that I'm not in a very intelligent mood, so I'll just nod 'knowingly' at whatever is said (while secretly agreeing with Student20)... More of a geek here than a physics nerd.

But welcome to the forums anyhow, I hope you enjoy it :) Got any takes on the sexy-nerd debate?

Hello fellow geek!

I've given up on the disc problem!

See you around.

I like my men nerdy/geeky but practical and my women not so geeky and a little dependant!

Nexas wrote:

I'm a geek, my partner's a geek and I love it! I love geeky girls anyway (I have a bit of a glasses fetish too I think) but the fact that we're both geeks also means I can go on and on and on (as can she) and we both actually listen and enjoy what the other person's saying LOL

Geeks actually talk! All geeks love a good discussion so I guess we're good at listening!

Well, I have a degree in Computing, so I'm quite nerdy myself, so like a guy who's at a similar intelligence level to myself. My boyfriend, he's only been to college, but his computer knowledge baffles even me alot of the time.

For me, its not necessarily the geekness in a guy that's attractive, but just having someone who I can associate with.

Oh My God! I leave for a few hours and I come back to this???!!!

I'll try not to let it happen again guys, but beware of years of sleepless nights...

Theres always one trouble maker....