A low-density block with a weight of 18.0 N is placed in a beaker of water and tied to the bottom of the beaker by a vertical string of fixed length. As water is steadily added to the beaker, the block becomes more and more submerged. a) When the block is 25% submerged, the tension in the string is 20.0 N. The string will break if its tension exceeds 80.0 N. What percentage of the block is submerged at the instant the string breaks? % b) After the string breaks the block bobs around for a while and then eventually comes to a new equilibrium position, floating at the water surface in the beaker. What percentage of the block is submerged when equilibrium is reached? %

A low-density block with a weight of 18.0 N is placed in a beaker of water and tied to the bottom of the beaker by a vertical string of fixed length. As water is steadily added to the beaker, the block becomes more and more submerged. a) When the block is 25% submerged, the tension in the string is 20.0 N. The string will break if its tension exceeds 80.0 N. What percentage of the block is submerged at the instant the string breaks? % b) After the string breaks the block bobs around for a while and then eventually comes to a new equilibrium position, floating at the water surface in the beaker. What percentage of the block is submerged when equilibrium is reached? %