Question

An object, partially immersed in water, displaced $680kg$ of water. How much is the buoyant force acting on the object? ($g=10m/s^2$ )

• A. $68N$
• B. $680N$
• C. $6800N$
• D. $6.8N$

Answer 1

Answer: (C)

$6800N$

Answer is C.
Buoyant Force is an upward force on the object submerged in a fluid (completely or partially), that is equal to the weight of the fluid that is displaced by the object.
In this case, an object, partially immersed in water, displaced $680kg$ (mass)of water. $a=10m/s^2$.
The force acting on it is given as $F=ma=680\times 10=6800N$.
Hence, the buoyant force acting on the object is 6800 N.