Question

When the body is in equilibrium beneath the liquid then which of the following is true?

(a) We equate all the components of the forces acting on the body equal to their resultant vector’s magnitude

(b) We equate all the components of the forces acting on the body equal to their resultant vector’s magnitude square

(c) We equate all the components of the forces acting on the body equal to their resultant vector’s magnitude square root

(d) We equate all the components of the forces acting on the body equal to zero

This question was addressed to me by my school teacher while I was bunking the class.

My doubt stems from Fluid Pressure in division Centre of Gravity and Centroid of Engineering Mechanics

Answer 1

Right choice is (d) We equate all the components of the forces acting on the body equal to zero

Explanation: Yes, we equate all the components of the three axis equal to zero. That is the resultant of the forces along the three axis are being equated to zero. This brings in that there is no net force along any direction. Hence equilibrium.