how do you determine the buoyant force when object is immersed in water?

Answer 1

The buoyant force is equal to the weight of the water displaced (or any other liquid or gas).

Fb=pgV
Fb - buoyant force
p - density of water (kg/m^3) = 1000 kg/m^3
V - volume of the water displaced
g- acceleration due to gravity 9.81 m/s^2 (like in weigh W=mg)

Case 1: Object's density is less than water
Fb= pgV = p'gV'
p - density of the water (kg/m^3) = 1000 kg/m^3
p' - density of the object (kg/m^3) = ?
V - volume of the water displaced
V' - volume of the object
g- acceleration due to gravity 9.81 m/s^2

Case 2. Objects density is greater than water.
Fb= pgV'
since object will sink the volume displaced equal to that of the object.

Answer 2

The buoyant force can be expressed using the following equation:

F_{buoyant} = - rho V g ,

where


rho , is the density of the fluid;
V is the volume of the object submerged;
g is the standard gravity (approx 9.81 N/kg on Earth). Negative sign must be used since the buoyancy is opposite in direction with the acceleration due to gravity.

Answer 3

How To Find Buoyant Force

Answer 4

Bouyant force is equal to the volume of the fluid displaced times the density of the fluid divided by the local gravitational field. Doug EDIT: For pure genius: How do you express volume in Newtons? You seem to be suffering from the usual confusion between 'weight','mass', and 'force'. They are three -totally- different things.

Answer 5

Buoyant force on an object immersed in water is equal to weight of water whose volume is equal to the volume of that portion of object which is inside water

Suppose you have a bar on which the volume is graduated, you immers say 10 cc of bar in water ,then buoyant force on bar is weight of 10 cc of water.

If 150 cc of bar in water ,then buoyant force on bar is weight of 150 cc of water.

If volume V of bar in water ,then buoyant force on bar is weight of volume V of water.

To know the buoyant force on an object (which is in water), we find out what volume of that object is in water ,then weight of that volume of water is equal to buoyant force on the object immersed in water