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Mechanics...
Ok long mechanics question...
Two identical beads A and E, each of mass m are threaded on a rough straight horizontal wire. The beads are joined by a light inextensible string of length 4a. Particles B, C, D, each of mass 2m, are attached to the string so that AB = BC = CD = DE = a. The system hangs freely under gravity in a vertical plane. The coefficient of friction between each bead and the wire is 1/4. Prove that, for the system in equilibrium in a symmetrical shape, the greatest possible value of the distance AE is:
2a(1/root10 + 1/root2)
Good luck
Two identical beads A and E, each of mass m are threaded on a rough straight horizontal wire. The beads are joined by a light inextensible string of length 4a. Particles B, C, D, each of mass 2m, are attached to the string so that AB = BC = CD = DE = a. The system hangs freely under gravity in a vertical plane. The coefficient of friction between each bead and the wire is 1/4. Prove that, for the system in equilibrium in a symmetrical shape, the greatest possible value of the distance AE is:
2a(1/root10 + 1/root2)
Good luck
jonas123
Thank you thank you 
You've earnt yourself some rep
You've earnt yourself some repThanks for the rep jonas - but there's a problem!
It's not that I'm complaining, but I didn't get any rep points awarded.
Now you've got 500+ posts, plus 1 gem, plus 3mths registered, so I should have got 5+1+3 = 8 points. But I didn't get any and you're listed with a grey gem in my reps award list, meaning you don't have enough to give rep - but you do!
Lke I said, I'm not complaining - I'm not in bother about (not) getting some rep points - the kudos from simply being told of it is fine - but it means that you're not being allowed to give out rep! And you should be able to.
Providing I've worked out the rep points system, then maybe you should ask the mods about this?
Fermat
Thanks for the rep jonas - but there's a problem!
It's not that I'm complaining, but I didn't get any rep points awarded.
Now you've got 500+ posts, plus 1 gem, plus 3mths registered, so I should have got 5+1+3 = 8 points. But I didn't get any and you're listed with a grey gem in my reps award list, meaning you don't have enough to give rep - but you do!
Lke I said, I'm not complaining - I'm not in bother about (not) getting some rep points - the kudos from simply being told of it is fine - but it means that you're not being allowed to give out rep! And you should be able to.
Providing I've worked out the rep points system, then maybe you should ask the mods about this?
It's not that I'm complaining, but I didn't get any rep points awarded.
Now you've got 500+ posts, plus 1 gem, plus 3mths registered, so I should have got 5+1+3 = 8 points. But I didn't get any and you're listed with a grey gem in my reps award list, meaning you don't have enough to give rep - but you do!
Lke I said, I'm not complaining - I'm not in bother about (not) getting some rep points - the kudos from simply being told of it is fine - but it means that you're not being allowed to give out rep! And you should be able to.
Providing I've worked out the rep points system, then maybe you should ask the mods about this?
I think there is a problem with the rep thing
mathz
whats a "rep point" ?
go here
http://gosh.ex.ac.uk/~osw201/ukl/alt.HTM?altfaq_reputation#altfaq_reputation
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