All entries for Monday 30 July 2007

July 30, 2007

The dichotomy paradox

A mathematician, a physicist and an engineer were asked to answer the following question. A group of boys are lined up on one wall of a dance hall, and an equal number of girls are lined up on the opposite wall. Both groups are then instructed to advance toward each other by one quarter the distance separating them, every ten seconds (i.e., if they are distance d apart at time 0, they are d/2 at t=10, d/4 at t=20, d/8 at t=30, and so on.) When do they meet at the center of the dance hall? The mathematician said they would never actually meet because the series is infinite. The physicist said they would meet when time equals infinity. The engineer said that within one minute they would be close enough for all practical purposes.

July 2007

Mo Tu We Th Fr Sa Su
Jun |  Today  |
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31               

Search this blog



Most recent comments

  • Why am I awake at this time in the morning? There is an absorbing feeling within my chest, and it wo… by Bodhi on this entry
  • I think the clubbing scene has bedome quite interesting in recent years, especially with drum and ba… by sc26 on this entry
  • But any real physicist would know that within an hour or so, they would be a Plank–length apart and … by Ian on this entry
  • Big LOLZ. This joke is essentially: "Mathmos are nerds, so are Physbods. Engineers, on the other han… by on this entry
  • About what is this entry? Are you climbing? That is exciting! No wait, you say it only "feels" like … by on this entry

Blog archive

Not signed in
Sign in

Powered by BlogBuilder