#### Posers and Puzzles

uzless
Posers and Puzzles 22 Oct '12 15:06
1. uzless
The So Fist
22 Oct '12 15:06
You notice a strange noise coming from one of your tires as you are driving. You're not sure which tire is making the noise though and a visual inspection doesn't show anything obvious wrong.

You decide to switch the bad tire and replace it with a good tire.

What is the fewest amount of "moves" you could perform to determine the bad tire?
2. forkedknight
Defend the Universe
22 Oct '12 17:26
Do you have only a single spare tire?
3. 22 Oct '12 20:331 edit
Fewest possible number of moves you *could* perform = 1: You perform the switch, and you are lucky, the sound goes away so you know it is the tyre you took off.
4. wolfgang59
Mr. Wolf
23 Oct '12 02:00
Originally posted by uzless
You notice a strange noise coming from one of your tires as you are driving. You're not sure which tire is making the noise though and a visual inspection doesn't show anything obvious wrong.

You decide to switch the bad tire and replace it with a good tire.

What is the fewest amount of "moves" you could perform to determine the bad tire?
With one new tyre you can do it in max of 3 changes.

With two new tyres you can do it in 2 changes.
5. coquette
25 Oct '12 03:27
None. Hubby does it.
6. kevcvs57
Flexible
26 Oct '12 09:34
Originally posted by wolfgang59
With one new tyre you can do it in max of 3 changes.

With two new tyres you can do it in 2 changes.
"With two new tyres you can do it in 2 changes"

Is that 2*2 or 1*2.
7. 26 Oct '12 16:38
Originally posted by wolfgang59
With one new tyre you can do it in max of 3 changes.

With two new tyres you can do it in 2 changes.
You could fix the problem in a max of 2 changes with 2 new tires but would you be able to determine the bad tire?
8. wolfgang59
Mr. Wolf
26 Oct '12 21:27
Originally posted by tomtom232
You could fix the problem in a max of 2 changes with 2 new tires but would you be able to determine the bad tire?
1. Change the two front tyres for new.

2a)If noise persists its one of the back ones so just replace with one of the ex-front ones.

2b)If noise has gone its one of the front ones, put one of them onto the back to find out which.
9. sonhouse
Fast and Curious
27 Oct '12 01:30
Originally posted by wolfgang59
1. Change the two front tyres for new.

2a)If noise persists its one of the back ones so just replace with one of the ex-front ones.

2b)If noise has gone its one of the front ones, put one of them onto the back to find out which.
What if the problem goes away after changing the front two? You still don't know which of the two were bad, you just know the problem went away. It could have an internal defect not visible.
10. forkedknight
Defend the Universe
27 Oct '12 06:43
Originally posted by sonhouse
What if the problem goes away after changing the front two? You still don't know which of the two were bad, you just know the problem went away. It could have an internal defect not visible.
In two changes, I think you can either a) identify the bad tire, or b) fix the problem, but not necessarily both.
11. venda
Dave
27 Oct '12 21:41
Originally posted by uzless
You notice a strange noise coming from one of your tires as you are driving. You're not sure which tire is making the noise though and a visual inspection doesn't show anything obvious wrong.

You decide to switch the bad tire and replace it with a good tire.

What is the fewest amount of "moves" you could perform to determine the bad tire?
1 - assuming you are driving a motor bike
12. forkedknight
Defend the Universe
28 Oct '12 14:30
Originally posted by venda
1 - assuming you are driving a motor bike
I approve
13. 28 Oct '12 20:59
Originally posted by venda
1 - assuming you are driving a motor bike
Usually you would be "riding" a motor bike, at least in the uk.
14. 29 Oct '12 03:02
Even for driving a car only one change is needed to determine the bad tyre.

You do that James Bond trick where you flip the car up on two wheels.
If you cannot hear the noise you know it's one of the tyres n the air.

You change one of those tyres. Drive normally.
If you still hear the noise you have determined which tyre is bad.

It may be possible to do with it no changes by covering each tyre with
a fine powder and driving 50 metres. The tyre makng the noise will
have shaken off the most powder. (I think.)
15. sonhouse
Fast and Curious
04 Dec '12 14:32
Originally posted by greenpawn34
Even for driving a car only one change is needed to determine the bad tyre.

You do that James Bond trick where you flip the car up on two wheels.
If you cannot hear the noise you know it's one of the tyres n the air.

You change one of those tyres. Drive normally.
If you still hear the noise you have determined which tyre is bad.

It may be poss ...[text shortened]... d driving 50 metres. The tyre makng the noise will
have shaken off the most powder. (I think.)
Alternately, you could drive through a foot deep creek and note which tire is losing air by the bubbles.