Leaderboard

A yard stick was cut on 1 foot mark so that the other 2 footer stick cut can be placed on top of another yardstick to make it roll or pivot on its ends and middle around (above and below) the yardstick clockwise. While the 1 footer stick was placed on top of 2 footer stick to make it roll around it counterclockwise without touching the fixed yardstick. Starting at position shown and same 1 RPM motion, how long will it take for the sticks to knock the ball down?

This is a puzzle a friend and I have been trying to solve and we've yet to do so. You have 19 tetrominoes in the following configurations: You have to fit these tetrominoes in a 10x10 grid meeting the following criteria. 1) The first eight rows must have one, and only one, empty space. 2) None of these empty spaces can be adjacent. 3) No tetromino can share a vertex (i.e. "touching") with another of the same type (i.e.J-blocks, L-blocks, T-blocks, S-blocks, Z-blocks, and I-blocks). 4) You must use the tetromino configurations as they are (no "flipping") We've been working on it and the best we could get is the first seven rows.