Lerry places a 3.0-kg box on a 8.5-kg board, part of which h…
Lerry places a 3.0-kg box on a 8.5-kg board, part of which hangs over the edge of a table, as shown in the figure. The leftmost 30 cm of the board lie on the table, while the remaining 20 cm of the board hang over the edge of the table, for a total length of 50 cm. How far from the rightmost tip of the board can the center of the box be placed before the board begins to tilt?