Question

. If an object (Wt=20N) floats inside the water. What is the upthrust acting on it

10N

15N

20N

25N​

Answer 1

Explanation:

This causes a resultant force upwards. This force is called upthrust . An object in a fluid is displacing some of the fluid. The upthrust force is equal in size to the weight of the fluid displaced by the object

20N

Answer 2

Correct answer is

$\huge\bf{\fbox\red{20 Newton}}$

$\bf{\fbox\orange{Explanation}}$

Upthrust = weight of the liquid displaced by the submerged part of the body Upthrust = mass of liquid displaced x Acceleration due to gravity Upthrust = volume of liquid displaced x density of liquid displaced x Acceleration due to gravity,Since volume of solid immersed is equal to the volume of the liquid displaced.

$\bf{\fbox\blue{Formula}}$

Fb = -pgv

Fb= buoyant force

p = fluid density

g = acceleration due to gravity

V = fluid volume