Question: Now level of the liquid starts decreasing slowly. When the level of liquid is at a height $h_1$ abov...

Question

Now level of the liquid starts decreasing slowly. When the level of liquid is at a height $h_1$ above the cylinder the block starts moving up. At what value of $h_1$ , will block rise?

Answer 1

Solution

A tipping–analysis (balancing moments about the edge of the supporting hole) shows that the block “lifts off” when the water level above it (measured suitably) reaches h₁ = 4h/9.