a 250 mm × 250 mm × 450 mm block weighs 50 n when fully submerged in water.
What is the weight of a 250 mm × 250 mm × 450 mm block when fully submerged in water?
Answer: According to LectureNotes, a 250 mm × 250 mm × 450 mm block weighs 50 N when fully submerged in water. The weight of an object submerged in water can be determined using Archimedes’ principle, which states that the buoyant force acting on an object is equal to the weight of the fluid displaced by the object.
When an object is fully immersed in water, it displaces an amount of water equal to its volume. The weight of this displaced water is equal to the buoyant force acting on the object. Therefore, if the weight of the block in water is equal to 50 N, it means that the buoyant force acting on the block is also 50 N.
From this information, we can conclude that the weight of the block itself is 50 N. This implies that the block’s weight in air is equal to its weight in water, as the buoyant force cancels out its weight.