Posers and Puzzles

Posers and Puzzles

  1. Standard memberuzless
    The So Fist
    Voice of Reason
    Joined
    28 Mar '06
    Moves
    9908
    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. Standard memberforkedknight
    Defend the Universe
    127.0.0.1
    Joined
    18 Dec '03
    Moves
    16172
    22 Oct '12 17:26
    Do you have only a single spare tire?
  3. Joined
    26 Apr '03
    Moves
    26533
    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. Standard memberwolfgang59
    Mr. Wolf
    at home
    Joined
    09 Jun '07
    Moves
    46061
    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. Subscribercoquette
    Already mated
    Omaha, Nebraska, USA
    Joined
    04 Jul '06
    Moves
    957049
    25 Oct '12 03:27
    None. Hubby does it.
  6. Subscriberkevcvs57
    Flexible
    The wrong side of 60
    Joined
    22 Dec '11
    Moves
    20475
    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. Joined
    15 Jun '06
    Moves
    16334
    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. Standard memberwolfgang59
    Mr. Wolf
    at home
    Joined
    09 Jun '07
    Moves
    46061
    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. Standard membersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52874
    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. Standard memberforkedknight
    Defend the Universe
    127.0.0.1
    Joined
    18 Dec '03
    Moves
    16172
    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. Subscribervenda
    Dave
    S.Yorks.England
    Joined
    18 Apr '10
    Moves
    61034
    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. Standard memberforkedknight
    Defend the Universe
    127.0.0.1
    Joined
    18 Dec '03
    Moves
    16172
    28 Oct '12 14:30
    Originally posted by venda
    1 - assuming you are driving a motor bike
    I approve
  13. Joined
    26 Apr '03
    Moves
    26533
    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. e4
    Joined
    06 May '08
    Moves
    27978
    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. Standard membersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52874
    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.
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