Question

A submarine is 50 m below the surface of the ocean and its weight is exactly balanced with the thrust. If it descends to 100 m and stops, the buoyant force (thrust) (a) does not change
(b) decreases
(c) increases
(d) cannot be determined
(e) the direction is reversed
And why?

Answer 1

Answer:(a)does not change

Explanation:

Given

Submarine is 50 m below the surface

Now submarine descends to 100 m and stops

As we know that pressure difference at a depth of h is given by

$P=\rho gh$

where $\rho$=Density of fluid

g=acceleration due to gravity

h=height below free surface of liquid

buoyant force is equal to volume displaced by object

as the submarine is already in water therefore buoyant force will remain same.