(1) A block is placed on a wooden plank, which is initially
horizontal. One end of the plank is slowly raised to make it more
and more inclined, and for a while the block stays in place on the
plank and doesn't slide due to static friction. Finally, when the
plank reaches an incline of 56.3o above horizontal, the
block begins to slide. What is
the coefficient of static
friction between the block and the plank?
(2) Continuing the story... after...