Question 321995PhysicsWAEC
A body weighing 10 N in air is partially immersed in water. It displaces water of mass 0.3 kg. What is the upthrust on the body? (g = 10 ms -2 )
A
12.0 N
B
7.0 N
C
3.3 N
D
3.0 N
Step-by-Step Explanation
Upthrust, or buoyant force, is equal to the weight of the fluid displaced by the submerged part of the body. In this case, the mass of the displaced water is 0.3 kg, which corresponds to a weight of 0.3 kg × 10 m/s² = 3 N. Therefore, the upthrust on the body is 3 N.