A piece of wood floats in water kept in a breaker. IF the beaker moves with a vertical acceleration a, the wood will

A piece of wood floats on water.

A block of wood is floating on the surface of water in a beaker. The beaker is covered with a bell jar and the air is evacuated. What will happen to the block ?

A block of wood is floating on the surface of water in a beaker. The beaker is covered with a bell jar and the air is evacuated. What will happen to the block ?