At what situation an object that is submerged in to liquid will rise up
An object that is submerged in liquid will rise up when the buoyant force acting on the object is greater than the gravitational force pulling it down. This buoyant force is generated by the displacement of liquid by the object that is submerged. The buoyant force is equal to the weight of the fluid displaced by the object. As the object displaces more fluid, the buoyant force increases until it exceeds the object's weight, causing it to rise to the surface.
An object submerged in a liquid will rise up if the buoyant force (upward force exerted by the liquid) is greater than or equal to the weight of the object. This occurs under the following circumstances:
1. If the density of the object is less than the density of the liquid: When the object is less dense than the liquid it is submerged in, it will experience a greater upward buoyant force than downward gravitational force. This causes the object to float or rise to the surface.
2. If the object displaces a volume of liquid greater than its own volume: According to Archimedes' principle, the buoyant force is equal to the weight of the liquid displaced by the object. If the object displaces more liquid than its own volume, the buoyant force will be greater than its weight and it will float or rise.
Keep in mind that if the object is completely submerged, the buoyant force will only act on the part of the object that is below the liquid's surface. The part of the object above the surface will be unaffected by the buoyant force and will still experience the same weight force as when it is out of the liquid.