At 15:17 16/06/2011 +0100, Allan Reese (Cefas) wrote:
>The circle "revolves" when a point on the circumference rotates 360
>degrees relative to the centre. If the small circle slides round the large
>one with the marked point maintaining a fixed orientation, it has not
>revolved. The large circle has circumference 3X that of the small circle.
>In rolling round, whether inside or outside the large circle, the small
>circle revolves three times and arrives back at its start point. Starting
>at the top, after 1 revolution (360) the contact point is 4 o'clock and
>the mark points down, after 2 revolutions it's at 8 o'clock and after 3
>revolutions it's back where it started.
Now I really am confused. What do you mean by 'rotates 360 degrees
relative to it's centre'? Does that not bring a mark on the circumference
back to the same place (e.g. 'pointing south') that it started?
Kind Regards,
John
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