Answer the question before watching the video.

It seems easy.

This video explains it.

https://www.youtube.com/watch?v=FUHkTs-Ipfg

---

Bobby. wrote on Dec 1^st, 2023 at 9:33pm:

Answer the question before watching the video. It seems easy. This video explains it. https://www.youtube.com/watch?v=FUHkTs-Ipfg

I didn't believe the answer was 3 - Thought that was obvious.

The answer is 4. that isn't obvious.

Dnarever wrote on Dec 1^st, 2023 at 10:10pm:

Bobby. wrote on Dec 1st, 2023 at 9:33pm: Answer the question before watching the video. It seems easy. This video explains it. I didn't believe the answer was 3 - Thought that was obvious. The answer is 4. that isn't obvious.

But it's 3 if you roll the circle along a straight line    :)

but not around a circle!

Bobby. wrote on Dec 1^st, 2023 at 10:16pm:

Dnarever wrote on Dec 1st, 2023 at 10:10pm: Bobby. wrote on Dec 1st, 2023 at 9:33pm: Answer the question before watching the video. It seems easy. This video explains it. I didn't believe the answer was 3 - Thought that was obvious. The answer is 4. that isn't obvious. But it's 3 if you roll the circle along a straight line    :) but not around a circle!

If you work out the circumference of both circles you get 3. This is because the error is that the effective radius of the outer circle is radius 1 plus radius 2.  i.e if the small circle radius is 2 then the second is 6. these numbers give the result of 3.

The distance between the centre point and the centre of the outer circle is 8.  R1 + R2

Formula 2 X R X Pi

It seems crazy.

Bobby. wrote on Dec 1^st, 2023 at 10:16pm:

Dnarever wrote on Dec 1st, 2023 at 10:10pm: Bobby. wrote on Dec 1st, 2023 at 9:33pm: Answer the question before watching the video. It seems easy. This video explains it. I didn't believe the answer was 3 - Thought that was obvious. The answer is 4. that isn't obvious. But it's 3 if you roll the circle along a straight line    :) but not around a circle!

If you make the 2 circles it rotates 4 times. once per quarter.

DNA,

Quote:

It seems crazy.

Our intuition was wrong.
That is why all engineering designs have to be tested as
they are based on assumptions that sound perfect but could be wrong.

Intriguing, but beyond my pay grade.    ;D

   Thanks for the link.

that is a mathematical question, not much to do with intuition

AusGeoff wrote on Dec 1^st, 2023 at 11:16pm:

Intriguing, but beyond my pay grade.    ;D    Thanks for the link.

But it's well explained in the video -
you always have to add 1 to the result because the circle causes an extra rotation.
That accounts for sidereal time on Earth being one extra day per year  i.e
not 365.25 days but 366.25 days per year.  (approx)


https://www.realclearscience.com/blog/2022/09/08/how_many_times_does_the_earth_rotate_in_one_year_the_answer_might_surprise_you_850085.html

Sprintcyclist wrote on Dec 2^nd, 2023 at 1:56am:

that is a mathematical question, not much to do with intuition

But even those who wrote the exam got it wrong.
Almost everyone gets it wrong.

Bobby. wrote on Dec 2^nd, 2023 at 5:54am:

Sprintcyclist wrote on Dec 2nd, 2023 at 1:56am: that is a mathematical question, not much to do with intuition But even those who wrote the exam got it wrong. Almost everyone gets it wrong.

The examiners got it wrong probably because they are not mechanical engineers. If they are, I wouldn't trust anything they'd design or make

My intuition told me straight away that radii shouldn't be taken into consideration, that only the curved surfaces should be considered to solve the question

However, I would have used those radii while quickly tearing out two paper circles to run the small one around the large one, to get the answer that way

The reason why the straight ribbon didn't work, is because it wasn't curved, obviously. The small circle travels a greater distance on a curved line than on a straight line

That's why the rack & pinion steering in a car is higher geared than two circular gears that have the same number of teeth, something I wish Kia had thought about when they designed the steering in my Cerato, it's way too high geared, it needs a smaller pinion

Bias_2012 wrote on Dec 2^nd, 2023 at 9:06am:

Bobby. wrote on Dec 2nd, 2023 at 5:54am: Sprintcyclist wrote on Dec 2nd, 2023 at 1:56am: that is a mathematical question, not much to do with intuition But even those who wrote the exam got it wrong. Almost everyone gets it wrong. The examiners got it wrong probably because they are not mechanical engineers. If they are, I wouldn't trust anything they'd design or make My intuition told me straight away that radii shouldn't be taken into consideration, that only the curved surfaces should be considered to solve the question However, I would have used those radii while quickly tearing out two paper circles to run the small one around the large one, to get the answer that way The reason why the straight ribbon didn't work, is because it wasn't curved, obviously. The small circle travels a greater distance on a curved line than on a straight line That's why the rack & pinion steering in a car is higher geared than two circular gears that have the same number of teeth, something I wish Kia had thought about when they designed the steering in my Cerato, it's way too high geared, it needs a smaller pinion

It shows are bad human thinking can be and
why everything needs to be checked.
Even teams of university professors can make appalling errors.

The answer is 3 if you roll the circle along a straight line -
but not around a circle! - then it's 4.

Bobby. wrote on Dec 2^nd, 2023 at 10:32am:

The answer is 3 if you roll the circle along a straight line - but not around a circle! - then it's 4.

That's correct

When you are driving your car and cut a corner, you will get around that corner quicker than the car behind that didn't cut the corner but is traveling at the same speed

Do you get it now?

Bias_2012 wrote on Dec 2^nd, 2023 at 11:11am:

Bobby. wrote on Dec 2nd, 2023 at 10:32am: The answer is 3 if you roll the circle along a straight line - but not around a circle! - then it's 4. That's correct When you are driving your car and cut a corner, you will get around that corner quicker than the car behind that didn't cut the corner but is traveling at the same speed Do you get it now?

I understand it now.
The fact that you are rotating around a circle causes the extra 1 to be added to the answer.
You can see it with 2 identical coins as shown in the video.

Bias_2012 wrote on Dec 2^nd, 2023 at 11:11am:

Bobby. wrote on Dec 2nd, 2023 at 10:32am: The answer is 3 if you roll the circle along a straight line - but not around a circle! - then it's 4. That's correct When you are driving your car and cut a corner, you will get around that corner quicker than the car behind that didn't cut the corner but is traveling at the same speed Do you get it now?

BuyArse2012 is a genius.

Report to Chez Gordon immediately to receive a professorship in WTF Knowledge.

Laugh till you cry wrote on Dec 2^nd, 2023 at 11:29am:

Bias_2012 wrote on Dec 2nd, 2023 at 11:11am: Bobby. wrote on Dec 2nd, 2023 at 10:32am: The answer is 3 if you roll the circle along a straight line - but not around a circle! - then it's 4. That's correct When you are driving your car and cut a corner, you will get around that corner quicker than the car behind that didn't cut the corner but is traveling at the same speed Do you get it now? BuyArse2012 is a genius. Report to Chez Gordon immediately to receive a professorship in WTF Knowledge.

Bias is a true genius  -
he's the only one who knew the answer without watching the video.

LTYC didn't know.

Bobby. wrote on Dec 2^nd, 2023 at 11:58am:

Laugh till you cry wrote on Dec 2nd, 2023 at 11:29am: Bias_2012 wrote on Dec 2nd, 2023 at 11:11am: Bobby. wrote on Dec 2nd, 2023 at 10:32am: The answer is 3 if you roll the circle along a straight line - but not around a circle! - then it's 4. That's correct When you are driving your car and cut a corner, you will get around that corner quicker than the car behind that didn't cut the corner but is traveling at the same speed Do you get it now? BuyArse2012 is a genius. Report to Chez Gordon immediately to receive a professorship in WTF Knowledge. Bias is a true genius  - he's the only one who knew the answer without watching the video. LTYC didn't know.

BuyArse2012 has been going in circles and cutting corners all his life.

His last revolution brought him to a place where he was captured in Bobby's orbit. Bullsh!t is more powerful than gravity in Bobbyworld.

He is now bleating that his communication provider cut him off using the moron exclusion clause.

Laugh till you cry wrote on Dec 2^nd, 2023 at 12:37pm:

BuyArse2012 has been going in circles and cutting corners all his life. His last revolution brought him to a place where he was captured in Bobby's orbit. Bullsh!t is more powerful than gravity in Bobbyworld. He is now bleating that his communication provider cut him off using the moron exclusion clause.

forgiven for mocking a true genius.

namaste

Sprintcyclist wrote on Dec 2^nd, 2023 at 1:56am:

that is a mathematical question, not much to do with intuition

True.

Great find Bobby.

I'm too Politically (Language) minded to be Mathematical (it's competitor on an equal platform).

I did go for my 'intuitive' aspect straight away, rather than thinking about it mathematically and both 3 & 9 seemed to cancel each other out. Bowling middle-stump at 6 also didn't 'obviously' seem right either.
So I left it at that and clicked on the clip to find out where I went wrong or right??

Personally, I would have taken legal action against the Education Board for Mental Abuse!  >:( :D

Not 'intuition' - simple mathematics at school which most of us have long forgotten since we do not use it...

It took the intuition of three students though, to speak up where hundreds of thousands 'failed' to notice what truly was at hand.

This is the hardest part of maths (or science/engineering) - trying to model a real problem as a mathematical one. At school we are taught to solve equations, but not to create them. We are taught to solve an equation, then spoon fed a problem to match it.

Or, you could just visualise it. Or draw it out.

freediver wrote on Dec 2^nd, 2023 at 11:41pm:

This is the hardest part of maths (or science/engineering) - trying to model a real problem as a mathematical one. At school we are taught to solve equations, but not to create them. We are taught to solve an equation, then spoon fed a problem to match it. Or, you could just visualise it. Or draw it out.

Did you get it right?

You look at the locus of the centre of Circle A and the answer is obvious—the centre of circle A describes a circle around circle B. Radius of this circle is 3 + 1.

Jovial Monk wrote on Dec 3^rd, 2023 at 6:41am:

You look at the locus of the centre of Circle A and the answer is obvious—the centre of circle A describes a circle around circle B. Radius of this circle is 3 + 1.

Easy to say after you watched the video.   ::)

Never watched the video idiot!

Jovial Monk wrote on Dec 3^rd, 2023 at 7:02am:

Never watched the video idiot!

Listen poof -

when you move the first circle around the 2nd circle it automatically makes a rotation
as it rolls around - not just moves around.
that's what adds the extra rotation.   ::)

That is what I said you blithering booby! The centre of Circle A moves in a locus that is a circle with a radius the sum of radiusA + radiusB.

If you knew any math you would know I am right.

Jovial Monk wrote on Dec 3^rd, 2023 at 7:02am:

Never watched the video idiot!

Hence why we know you're full of it and a wannabe intellectual.  ;D

Great Topic Bobby. Good find.

Bobby. wrote on Dec 3^rd, 2023 at 5:20am:

freediver wrote on Dec 2nd, 2023 at 11:41pm: This is the hardest part of maths (or science/engineering) - trying to model a real problem as a mathematical one. At school we are taught to solve equations, but not to create them. We are taught to solve an equation, then spoon fed a problem to match it. Or, you could just visualise it. Or draw it out. Did you get it right?

I read the answer here before even thinking about it.

Jasin wrote on Dec 3^rd, 2023 at 9:22am:

Jovial Monk wrote on Dec 3rd, 2023 at 7:02am: Never watched the video idiot! Hence why we know you're full of it and a wannabe intellectual.  ;D Great Topic Bobby. Good find.

Thanks JaSin.
It's a good party trick too -
you can prove it with 2 identical coins.

freediver wrote on Dec 3^rd, 2023 at 9:24am:

Bobby. wrote on Dec 3rd, 2023 at 5:20am: freediver wrote on Dec 2nd, 2023 at 11:41pm: This is the hardest part of maths (or science/engineering) - trying to model a real problem as a mathematical one. At school we are taught to solve equations, but not to create them. We are taught to solve an equation, then spoon fed a problem to match it. Or, you could just visualise it. Or draw it out. Did you get it right? I read the answer here before even thinking about it.

forgiven for not following the instructions in the first post.

namaste

Jasin wrote on Dec 3^rd, 2023 at 9:22am:

Jovial Monk wrote on Dec 3rd, 2023 at 7:02am: Never watched the video idiot! Hence why we know you're full of it and a wannabe intellectual.  ;D Great Topic Bobby. Good find.

Except I got it right in 1 second.

Jovial Monk wrote on Dec 3^rd, 2023 at 12:52pm:

Jasin wrote on Dec 3rd, 2023 at 9:22am: Jovial Monk wrote on Dec 3rd, 2023 at 7:02am: Never watched the video idiot! Hence why we know you're full of it and a wannabe intellectual.  ;D Great Topic Bobby. Good find. Except I got it right in 1 second.

Only 3 students got it right out of perhaps 1 million who took the test -
they informed the University that the exam answers were all wrong.
I call bullshit on your claim.

It was a locus problem as I saw immediately. The radius was obvious.

Agree, high school dropout?

Jovial Monk wrote on Dec 3^rd, 2023 at 1:15pm:

It was a locus problem as I saw immediately. The radius was obvious. Agree, high school dropout?

You're a bullshit artist Monk -
human intuition said the answer was 3 -
even the University professors were fooled.

I never thought the answer was three. I saw it was a locus problem and worked out the locus. You see, I am not stupid unlike you, HS dropout.

Jovial Monk wrote on Dec 3^rd, 2023 at 1:18pm:

I never thought the answer was three. I saw it was a locus problem and worked out the locus. You see, I am not stupid unlike you, HS dropout.

Monk,
you're a compulsive liar - you chose 3.

O Hail Caesar Monk.
He who figured it all out in 1 second like the Mathmatician he is.  ;D

That problem I did.

Jasin wrote on Dec 3^rd, 2023 at 1:29pm:

O Hail Caesar Monk. He who figured it all out in 1 second like the Mathmatician he is.  ;D

Monk is brighter than a team of university professors -

only 3 people in 1 million got it right.   ::)

There you go, now 4 people got it right.

Bobby. wrote on Dec 3^rd, 2023 at 1:36pm:

Jasin wrote on Dec 3rd, 2023 at 1:29pm: O Hail Caesar Monk. He who figured it all out in 1 second like the Mathmatician he is.  ;D Monk is brighter than a team of university professors - only 3 people in 1 million got it right.   ::)

Monk is licking himself where it matters again.  ;) ;D

Started a poll:

Does anyone believe that Monk knew the correct answer?

Everyone knows Monk is a habitual liar who blathers without a care in the hope someone will give him the attention he craves.
Monk hounds Bobby the most, because he knows Bobby will always 'forgive him'. He calls Bobby his favourite 'sucka'.

Poll is senseless—too few people here. An opinion poll is no way to answer a mathematical problem.

Jasin wrote on Dec 3^rd, 2023 at 1:50pm:

Everyone knows Monk is a habitual liar who blathers without a care in the hope someone will give him the attention he craves. Monk hounds Bobby the most, because he knows Bobby will always 'forgive him'. He calls Bobby his favourite 'sucka'.

As a Christian I have to forgive Monk all the time - and that is hard to do.   :-[

We know you are no christian!

Bobby. wrote on Dec 3^rd, 2023 at 1:57pm:

Jasin wrote on Dec 3rd, 2023 at 1:50pm: Everyone knows Monk is a habitual liar who blathers without a care in the hope someone will give him the attention he craves. Monk hounds Bobby the most, because he knows Bobby will always 'forgive him'. He calls Bobby his favourite 'sucka'. As a Christian I have to forgive Monk all the time - and that is hard to do.   :-[

Well you're a 'sucka' for being so then.
Being a Christian makes you an exploitable commodity for Monk to enjoy.
Would you forgive him, as a 'Christian' if he stole all your money, bum-raped you, slept with your wife and daughters and made you his attention-slave?

Don’t worry, Booby is no christian and gives fake forgiveness instead of apologies.

Jasin wrote on Dec 3^rd, 2023 at 2:41pm:

Bobby. wrote on Dec 3rd, 2023 at 1:57pm: Jasin wrote on Dec 3rd, 2023 at 1:50pm: Everyone knows Monk is a habitual liar who blathers without a care in the hope someone will give him the attention he craves. Monk hounds Bobby the most, because he knows Bobby will always 'forgive him'. He calls Bobby his favourite 'sucka'. As a Christian I have to forgive Monk all the time - and that is hard to do.   :-[ Well you're a 'sucka' for being so then. Being a Christian makes you an exploitable commodity for Monk to enjoy. Would you forgive him, as a 'Christian' if he stole all your money, bum-raped you, slept with your wife and daughters and made you his attention-slave?

No - I think I'd be like Russell:


https://www.youtube.com/watch?v=QPFKpyPrD_k

Then put an end to Monk once and for all.
Until then, you're his christian biatch who forgives him always.

Jasin wrote on Dec 3^rd, 2023 at 2:51pm:

Then put an end to Monk once and for all. Until then, you're his christian biatch who forgives him always.

Then I will have my vengeance, in this life or the next. ;D

Gutless!  ;D

Monk has you under his thumb, like he ripped Aussie off both in $60 and no cake.  ;D

Jasin wrote on Dec 3^rd, 2023 at 2:57pm:

Gutless!  ;D Monk has you under his thumb, like he ripped Aussie off both in $60 and no cake.  ;D

Monk deserves nothing.    ;D

Here's another one:


https://media.gab.com/system/media_attachments/files/156/939/341/playable/1eb8e96b1df01005.mp4