The mass of the rock doesn't make any difference. Anything with a volume of 21 L, when it's
completely submerged, displaces 21 L of water, and produces a buoyant force equal to the
weight of 21 L of water.
21 L of water has a mass of 21 Kg. Its weight is (MG) = (21 x 9.8) = 205.8 Newtons = 46.3 pounds. (rounded)
The amount of buoyant force is equal to the weight of the displaced water. The VOLUME of the displaced water is equal to the part of the solid that is submerged - thus, the buoyant force is equal to this volume, times the density of the water.
Density = mass / volume. An object will float if it has less density than the fluid in which it is placed. The buoyant force is equal to the volume (this may be the submerged part of the volume) times the density of the displaced fluid.
As soon as an object is completely submerged in the liquid, displacing the maximum volume of liquid.
On its volume.
buoyant force = density of the liquid*Volume*gravity. so the buoyant force is directly proportional to the density of a liquid.
The amount of buoyant force is equal to the weight of the displaced water. The VOLUME of the displaced water is equal to the part of the solid that is submerged - thus, the buoyant force is equal to this volume, times the density of the water.
That completely depends on the object's volume (which you have not mentioned). The buoyant force on it is equal to the weight of an equal volume of water.
Density = mass / volume. An object will float if it has less density than the fluid in which it is placed. The buoyant force is equal to the volume (this may be the submerged part of the volume) times the density of the displaced fluid.
As soon as an object is completely submerged in the liquid, displacing the maximum volume of liquid.
The buoyant force is zero when the object is just touching the liquid. As the object displaces more volume, the buoyant force increases until the object is completely submerged. Once the object is submerged, it doesn't matter how deep it is, the buoyant force remains constant.
The buoyant force on a submerged object is equal to the weight of the displaced fluid. The density of the water is 1,000 kg/m3, so its weight is 1,000 N/m3. The volume of the rock is 0.3 m3. The buoyant force = weight of the displaced water = (0.3 x 1,000) = 300 N.
On its volume.
The buoyant force is equal to the amount of water displaced. Multiply the volume of the object by the density of water - then convert that to a force (at about 9.8 newton/kilogram).
You wouldn't get the right reading of volume of the object, so you're density calculation would be off.
SUBmerged means that the entire thing is completely UNDER the fluid surface.IMmersed means that the thing has some part IN the fluid ... that is the part whose Volume displaces the fluid, which has buoyant force applied to it.(So, "completely immersed" is not redundant, but it means "submerged")
buoyant force = density of the liquid*Volume*gravity. so the buoyant force is directly proportional to the density of a liquid.
The upthrust is the volume, multiplied by the weight density of the liquid in which it is submerged - or the volume, times the mass density of the liquid, times the gravitational field.