Question

What is the expression for upward thrust on an object submerged in water

H: Height of liquid in the container
d: Density of Liquid
P: Pressure acting on the surface of water
A: area of cross-section of container
V’: Volume of object immersed in the liquid
V: volume of the container

• A. Hdg
• B. P/A
• C. V'dg
• D. Vdg

Answer 1

The correct option is C V'dg

Upthrust = (Volume of liquid displaced * density of liquid * acceleration due to gravity) and the volume of liquid displaced is equal to the volume of object immersed in liquid. If it is fully submerged in a liquid then the volume of liquid displaced will be equal to the volume of the object.