Advice about formula for measurements

Quote from: Tom on May 28, 2015, 03:26:42 PM

Quote from: Weatherwax on May 28, 2015, 03:24:42 PM

What do you mean by "I see as 10cm"? It's meaningless.

Have you ever looked at a ship sailing far away from a beach?

It looks smaller than it really is. So again,

I know the ship is 100 meter long.
I know I see it as 10 cm long from the beach.

OK two knowns.  You need a third.  How far away are you holding the ruler?

Quote

I guess the ship is 5 kilometers far away, but I am not sure about it.

OK, then I guess you must be holding the ruler about 5 meters away from you, you either have very long arms or someone else is holding it for you.

Quote

I want to know the exact distance.

We told you how to do that.  You are still missing one more unknown in order to figure it out.  How far are you holding the ruler from yourself?

It's complete nonsense. Have ever been on a beach looking at ship far away?
It looks small and it's not 5 meters above your head.

Tom your corect in that formulate is total nonsence. You would get more sence of it from this guy, then you would ever from theses tripe peddlers.
& he would provide you none.
At Home with Ashley Boomington: " class="bbc_link" target="_blank" rel="noopener noreferrer">

Tom your corect in that formulate is total nonsence. You would get more sence of it from this guy, then you would ever from theses tripe peddlers.
& he would provide you none.
At Home with Ashley Boomington: " class="bbc_link" target="_blank" rel="noopener noreferrer">

 

Rule of thumb estimate is 10x100 m=1,000m 10x1000 m=10,000m  estimated answer ship is 10km .

Quote from: BJ1234 on May 28, 2015, 03:36:44 PM

Quote from: Tom on May 28, 2015, 03:26:42 PM

Quote from: Weatherwax on May 28, 2015, 03:24:42 PM

What do you mean by "I see as 10cm"? It's meaningless.

Have you ever looked at a ship sailing far away from a beach?

It looks smaller than it really is. So again,

I know the ship is 100 meter long.
I know I see it as 10 cm long from the beach.

OK two knowns.  You need a third.  How far away are you holding the ruler?

Quote

I guess the ship is 5 kilometers far away, but I am not sure about it.

OK, then I guess you must be holding the ruler about 5 meters away from you, you either have very long arms or someone else is holding it for you.

Quote

I want to know the exact distance.

We told you how to do that.  You are still missing one more unknown in order to figure it out.  How far are you holding the ruler from yourself?

It's complete nonsense. Have ever been on a beach looking at ship far away?

Yes, yes I have.  But that is neither here nor there in your understanding of basic math.

It looks small and it's not 5 meters above your head.

Would you care to re-read my post before declaring it complete nonsense?  Also, point out where I said the ship was 5 meters above your head.  If this is any indication of how well you comprehend things, I can see why you are not understanding the math behind this simple exercise.

Quote from: Tom on May 28, 2015, 03:40:34 PM

Quote from: BJ1234 on May 28, 2015, 03:36:44 PM

Quote from: Tom on May 28, 2015, 03:26:42 PM

Quote from: Weatherwax on May 28, 2015, 03:24:42 PM

What do you mean by "I see as 10cm"? It's meaningless.

Have you ever looked at a ship sailing far away from a beach?

It looks smaller than it really is. So again,

I know the ship is 100 meter long.
I know I see it as 10 cm long from the beach.

OK two knowns.  You need a third.  How far away are you holding the ruler?

Quote

I guess the ship is 5 kilometers far away, but I am not sure about it.

OK, then I guess you must be holding the ruler about 5 meters away from you, you either have very long arms or someone else is holding it for you.

Quote

I want to know the exact distance.

We told you how to do that.  You are still missing one more unknown in order to figure it out.  How far are you holding the ruler from yourself?

It's complete nonsense. Have ever been on a beach looking at ship far away?

Yes, yes I have.  But that is neither here nor there in your understanding of basic math.

Quote

It looks small and it's not 5 meters above your head.

Would you care to re-read my post before declaring it complete nonsense?  Also, point out where I said the ship was 5 meters above your head.  If this is any indication of how well you comprehend things, I can see why you are not understanding the math behind this simple exercise.

Please look at this picture: http://www.dreamstime.com/royalty-free-stock-photography-man-looking-out-to-sea-image12647457

The person looking at the ship on eye level. He sees the ship as ... cm. Where is the ruler?

He has none.

However, that picture is irrelevant.  You are the one that is arguing from incredulity.  You are the one that said you measured a 100m ship with a ruler and it only measured 10cm across.  You have not said how far the ruler was away from you.  You have just asserted that you guessed the ship had to be 5km away from you. 

According to geometry, I have stated that the ruler must have been about 5 meters from you.  That is all there is. 

Your inability to understand a concept does not prove the concept to be false.

He has none.

However, that picture is irrelevant.  You are the one that is arguing from incredulity.  You are the one that said you measured a 100m ship with a ruler and it only measured 10cm across.  You have not said how far the ruler was away from you.  You have just asserted that you guessed the ship had to be 5km away from you. 

According to geometry, I have stated that the ruler must have been about 5 meters from you.  That is all there is. 

Your inability to understand a concept does not prove the concept to be false.

You can see with your thumb and a finger how long the ship is from where you are. That's your ruler and it's not 5 meters away from you.

Your formula does not work for this problem.

Quote from: Tom on May 28, 2015, 03:40:34 PM

Quote from: BJ1234 on May 28, 2015, 03:36:44 PM

Quote from: Tom on May 28, 2015, 03:26:42 PM

Quote from: Weatherwax on May 28, 2015, 03:24:42 PM

What do you mean by "I see as 10cm"? It's meaningless.

Have you ever looked at a ship sailing far away from a beach?

It looks smaller than it really is. So again,

I know the ship is 100 meter long.
I know I see it as 10 cm long from the beach.

OK two knowns.  You need a third.  How far away are you holding the ruler?

Quote

I guess the ship is 5 kilometers far away, but I am not sure about it.

OK, then I guess you must be holding the ruler about 5 meters away from you, you either have very long arms or someone else is holding it for you.

Quote

I want to know the exact distance.

We told you how to do that.  You are still missing one more unknown in order to figure it out.  How far are you holding the ruler from yourself?

It's complete nonsense. Have ever been on a beach looking at ship far away?

Yes, yes I have.  But that is neither here nor there in your understanding of basic math.

Quote

It looks small and it's not 5 meters above your head.

Would you care to re-read my post before declaring it complete nonsense?  Also, point out where I said the ship was 5 meters above your head.  If this is any indication of how well you comprehend things, I can see why you are not understanding the math behind this simple exercise.

I know shit talk when I read it. You see i'v used that methord to estamate ruff distance from the cattle stations . Its not spot on but its there abouts.
You jokers leave the second multiply out , because it shows up your curviture to be a total nonsene .

Quote from: BJ1234 on May 28, 2015, 04:54:56 PM

Quote from: Tom on May 28, 2015, 03:40:34 PM

Quote from: BJ1234 on May 28, 2015, 03:36:44 PM

Quote from: Tom on May 28, 2015, 03:26:42 PM

Quote from: Weatherwax on May 28, 2015, 03:24:42 PM

What do you mean by "I see as 10cm"? It's meaningless.

Have you ever looked at a ship sailing far away from a beach?

It looks smaller than it really is. So again,

I know the ship is 100 meter long.
I know I see it as 10 cm long from the beach.

OK two knowns.  You need a third.  How far away are you holding the ruler?

Quote

I guess the ship is 5 kilometers far away, but I am not sure about it.

OK, then I guess you must be holding the ruler about 5 meters away from you, you either have very long arms or someone else is holding it for you.

Quote

I want to know the exact distance.

We told you how to do that.  You are still missing one more unknown in order to figure it out.  How far are you holding the ruler from yourself?

It's complete nonsense. Have ever been on a beach looking at ship far away?

Yes, yes I have.  But that is neither here nor there in your understanding of basic math.

Quote

It looks small and it's not 5 meters above your head.

Would you care to re-read my post before declaring it complete nonsense?  Also, point out where I said the ship was 5 meters above your head.  If this is any indication of how well you comprehend things, I can see why you are not understanding the math behind this simple exercise.

I know shit talk when I read it. You see i'v used that methord to estamate ruff distance from the cattle stations . Its not spot on but its there abouts.
You jokers leave the second multiply out , because it shows up your curviture to be a total nonsene .

What is the correct formula or table for this problem?

When you measure a table and then you move it 100 meters you can see it becomes smaller. Then 200 meters and it becomes even more smaller.
You could calculate this with a formula, I presume.

It's trigonometry for gods sake.

Here's a good link if you need to learn it.
https://www.khanacademy.org/math/trigonometry/basic-trigonometry

Tom, you claimed to be an economics graduate.  Yet you can't even grasp the most basic of maths.

I call bullshit.

Tom, you claimed to be an economics graduate.  Yet you can't even grasp the most basic of maths.

I call bullshit.

Why then did not anyone give a proper formula?

Here is a challenge for you to prove that you know something.

And remember, the person who is standing on the beach can measure the length of the ship using his thumb and finger, 20 cm from his eyes.
And there is no point on the beach where the ship is so small that you can't see it anymore.

Tom, at nowhere in this thread anyone has claimed you can no longer see the ship with your eyes.  You comprehension skills are severely lacking.  Its no wonder why you cannot comprehend what is actually going on.

Why then did not anyone give a proper formula?

We've given methods. Plus it's not too easy to write maths in a forum post.
If o is the length of the ship according to the ruler, O the length in reality, a the distance of the ruler from your eye, and A the distance of the ship, the formula would be:
A = O/tan(tan^-1(o/a))
Which can clearly be simplified to:
A = Oa/o

Until you have found a ship that you know has length 100m, and measured a distance of 5km from it, and looked at it with a ruler from 5cm from your eye (absurdly close), and found it looks like 10cm, you simply have no grounds for your incredulity. I very much doubt you've even attempted this in real life, but if you have the numbers you've given us are simply wrong.

You can even test this formula on a small scale, without leaving your room.

You've been answered. Until you have a real life example rather than a made up situation which you're clearly struggling to visualize, don't act like you haven't been.

Tom, at nowhere in this thread anyone has claimed you can no longer see the ship with your eyes.  You comprehension skills are severely lacking.  Its no wonder why you cannot comprehend what is actually going on.

Look at the diagram and your formula if you can. It is based on the argument that somewhere else on the beach you see a different size of the ship. That's not possible on the small beach.

Quote from: BJ1234 on May 29, 2015, 03:16:15 AM

Tom, at nowhere in this thread anyone has claimed you can no longer see the ship with your eyes.  You comprehension skills are severely lacking.  Its no wonder why you cannot comprehend what is actually going on.

Look at the diagram and your formula if you can. It is based on the argument that somewhere else on the beach you see a different size of the ship. That's not possible on the small beach.

I think I can call it,  with all the evidence so far,  you are just trolling.   Not a bad effort,   the passive agressive act was good,  and the terminal stupidity somewhat endearing if frustrating. 

Tom == Troll

Quote from: Tom on May 29, 2015, 03:21:31 AM

Quote from: BJ1234 on May 29, 2015, 03:16:15 AM

Tom, at nowhere in this thread anyone has claimed you can no longer see the ship with your eyes.  You comprehension skills are severely lacking.  Its no wonder why you cannot comprehend what is actually going on.

Look at the diagram and your formula if you can. It is based on the argument that somewhere else on the beach you see a different size of the ship. That's not possible on the small beach.

I think I can call it,  with all the evidence so far,  you are just trolling.   Not a bad effort,   the passive agressive act was good,  and the terminal stupidity somewhat endearing if frustrating. 

Tom == Troll

The formula everyone is giving does not apply for this problem. Most are just theorists, completely out of step with reality.

The formula everyone is giving does not apply for this problem. As you said, most are just theorists, completely out of step with reality.

If you're going to disprove trigonometry, you're going to need more than that.

So, why does it not apply to this problem? It may just be the numbers you've provided are wrong, (5cm remains stupidly close).

Quote from: Tom on May 29, 2015, 02:38:00 AM

Why then did not anyone give a proper formula?

We've given methods. Plus it's not too easy to write maths in a forum post.
If o is the length of the ship according to the ruler, O the length in reality, a the distance of the ruler from your eye, and A the distance of the ship, the formula would be:
A = O/tan(tan^-1(o/a))
Which can clearly be simplified to:
A = Oa/o

Until you have found a ship that you know has length 100m, and measured a distance of 5km from it, and looked at it with a ruler from 5cm from your eye (absurdly close), and found it looks like 10cm, you simply have no grounds for your incredulity. I very much doubt you've even attempted this in real life, but if you have the numbers you've given us are simply wrong.

You can even test this formula on a small scale, without leaving your room.

You've been answered. Until you have a real life example rather than a made up situation which you're clearly struggling to visualize, don't act like you haven't been.

I am talking about a real event.

When you measure a table and then you move it 100 meters you can see it becomes smaller. Then 200 meters and it becomes even more smaller. We are talking about the same object.

Again,

You are standing on the position where you see the ship as 10 cm, using your thumb and finger just before your eyes.
The ship is 100 meters long.

There is no point on the beach where the ship is so small that you don't see the ship anymore or a different size on a different position. It's a small beach.

So, again your formula does not apply here. It's not that hard to understand.

I am talking about a real event.

Then your measurements are wrong.

When you measure a table and then you move it 100 meters you can see it becomes smaller. Then 200 meters and it becomes even more smaller. We are talking about the same object.

When has anyone even so much as hinted otherwise?

There is no point on the beach where the ship is so small that you don't see the ship anymore or a different size. It's a small beach.

Well you will see it as a different size, by your own admission. Whe has anyone ever said you wouldn't see it any more?

I mean, it's fine if you want to troll, most people here do, but you need to come up with something better than that.

Mathematics is a hoax a lie nothing to do in reality.

Quote from: Tom on May 29, 2015, 03:37:14 AM

I am talking about a real event.

Then your measurements are wrong.

Quote

When you measure a table and then you move it 100 meters you can see it becomes smaller. Then 200 meters and it becomes even more smaller. We are talking about the same object.

When has anyone even so much as hinted otherwise?

Quote

There is no point on the beach where the ship is so small that you don't see the ship anymore or a different size. It's a small beach.

Well you will see it as a different size, by your own admission. Whe has anyone ever said you wouldn't see it any more?

I mean, it's fine if you want to troll, most people here do, but you need to come up with something better than that.

omg, what kind of forum is this?

No one answering up to now does understand this simple question about the size of an object and its distance when you cannot move to a new position.

The calculation has been done before, calculating with different positions, so the formula should be known already.

Anyone reading this and understanding?

Quote from: JimmyTheCrab on May 29, 2015, 02:01:42 AM

Tom, you claimed to be an economics graduate.  Yet you can't even grasp the most basic of maths.

I call bullshit.

Why then did not anyone give a proper formula?

Here is a challenge for you to prove that you know something.

And remember, the person who is standing on the beach can measure the length of the ship using his thumb and finger, 20 cm from his eyes.
And there is no point on the beach where the ship is so small that you can't see it anymore.

Tom- there's no formula. It's a concept know as trigonometry, everyone is supposed to learn it in 9th grade. You can't just plug in numbers, you have to actually understand it first. You should click the link I provided, and learn trigonometry like the rest of the world.

Quote from: Tom on May 29, 2015, 02:38:00 AM

Quote from: JimmyTheCrab on May 29, 2015, 02:01:42 AM

Tom, you claimed to be an economics graduate.  Yet you can't even grasp the most basic of maths.

I call bullshit.

Why then did not anyone give a proper formula?

Here is a challenge for you to prove that you know something.

And remember, the person who is standing on the beach can measure the length of the ship using his thumb and finger, 20 cm from his eyes.
And there is no point on the beach where the ship is so small that you can't see it anymore.

Tom- there's no formula. It's a concept know as trigonometry, everyone is supposed to learn it in 9th grade. You can't just plug in numbers, you have to actually understand it first. You should click the link I provided, and learn trigonometry like the rest of the world.

you liar big big big liar.

Anyone reading this and understanding?

I understand you perfectly,   maybe better than you think.   Did you work out the height of the tree yet?

Quote from: BiJane on May 29, 2015, 03:40:02 AM

Quote from: Tom on May 29, 2015, 03:37:14 AM

I am talking about a real event.

Then your measurements are wrong.

Quote

When you measure a table and then you move it 100 meters you can see it becomes smaller. Then 200 meters and it becomes even more smaller. We are talking about the same object.

When has anyone even so much as hinted otherwise?

Quote

There is no point on the beach where the ship is so small that you don't see the ship anymore or a different size. It's a small beach.

Well you will see it as a different size, by your own admission. Whe has anyone ever said you wouldn't see it any more?

I mean, it's fine if you want to troll, most people here do, but you need to come up with something better than that.

omg, what kind of forum is this?

No one answering up to now does understand this simple question about the size of an object and its distance when you cannot move to a new position.

The calculation has been done before, calculating with different positions, so the formula should be known already.

Anyone reading this and understanding?

You wont get answers  out of theses lying bastards.  I'm still waiting for one on inertia , air flight times & fuel.

Quote from: Tom on May 29, 2015, 04:23:45 AM

Quote from: BiJane on May 29, 2015, 03:40:02 AM

Quote from: Tom on May 29, 2015, 03:37:14 AM

I am talking about a real event.

Then your measurements are wrong.

Quote

When you measure a table and then you move it 100 meters you can see it becomes smaller. Then 200 meters and it becomes even more smaller. We are talking about the same object.

When has anyone even so much as hinted otherwise?

Quote

There is no point on the beach where the ship is so small that you don't see the ship anymore or a different size. It's a small beach.

Well you will see it as a different size, by your own admission. Whe has anyone ever said you wouldn't see it any more?

I mean, it's fine if you want to troll, most people here do, but you need to come up with something better than that.

omg, what kind of forum is this?

No one answering up to now does understand this simple question about the size of an object and its distance when you cannot move to a new position.

The calculation has been done before, calculating with different positions, so the formula should be known already.

Anyone reading this and understanding?

You wont get answers  out of theses bastards.  I'm still waiting for one on inertia , air flight times & fuel.

So, no one on this forum understands what I am talking about?

Quote from: Tom on May 29, 2015, 04:23:45 AM

Anyone reading this and understanding?

I understand you perfectly,   maybe better than you think.   Did you work out the height of the tree yet?

Then, tell me how to measure UR DUM (30 meters in your example) on a small beach and a ship at sea.

So, no one on this forum understands what I am talking about?

Everyone on the forum understands perfectly,  the only one who doesn't is yourself,  my conclusion is that you are just deliberately playing dumb.