OpenStudy (anonymous):
this is related to the card problem from 'A Prime Obsession' consider a pack of cards, slide the top card out as far as it will go without toppling, this is half way. How far will the second go? By considering the top 2 cards as one the total length is 1 and half, so balance point is 3/4. i.e slide it a quarter out. All good so far. Now what about the 3rd card. I calculate it to move 1/8 out but all other sources say 1/6. Could someone explain, its driving me nuts ** well i am already !
OpenStudy (anonymous):
Does anyone have any ideas ? the book basically says to treat the card that is sliding as 1 card and halve the length the 'one' card to find the centre of mass. Is that in fact correct for 3 cards?
OpenStudy (anonymous):
sorted it thanks, for anyone interested you use moments of the cards above
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