Help on finding a website with physics problmes

Hi to all,
some time ago (> 2 years) I found a great webiste with physics problems. I
tried now to locate it with Google and I have not been able to. It is even
possible that, given that Google is very powerful, the website does not
exist anymore - I want to try and see if anyone knows its web address
though.

The hints I can supply are three problems that I found over there and a few
vague recalls on how the site was organized.

Problems (I am not looking for the solution of these, just for the website
where I found them first and I am sure I can find many more!)

- A climber is climbing a "mountain peak" that is a perfect and frictionless
cone. He has a rope that he arranges into a loop around the cone's tip. It
is clear that if the cone's apex angle is very small, the loop won't slip
off it, while when the angle is large ("flat cone") it will. What is the
maximum angle for which the loop won't slip off the tip of the cone?

- A cyclist is riding on a wet road. He has no fenders. What is the maximum
speed for which he won't get his back wet?

- (I am not sure whether the text of the third problem is quite exact) A
ball (of small mass) is resting on the ground. Someone drops a plank (of
large mass) onto it. The drop is such that the plank does not acquire
angular momentum ("dead on"). And it is elastic. Does the ball bounce and if
yes, by how much?


I recall moreover that the site added periodically (maybe weekly) new
problems, and there was a page where to each link to each problem's text
there corresponded a link with a hint and a link with the solution (some
maybe were just tentative solutions). I also recall that some of the
problems were taken from the notebook of some famous physicist, but I cannot
recall the name. I googled Kapitza notebook because I seem to remember an
Eastern European name, but I didn't get the result I wanted.

Thanks in advance!


.

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