To determine the upward thrust on a body when it is immersed in kerosene, we need to understand the principle of buoyancy. The upward thrust, also known as the buoyant force, is the force exerted by the fluid that opposes the weight of an object submerged in it.
Here’s the step-by-step solution:
1. Identify the weight of the body in air:
The weight of the body in air is given as [tex]\( 5.5 \, \text{N} \)[/tex].
2. Identify the weight of the body in kerosene:
The weight of the body when completely immersed in kerosene is given as [tex]\( 3.0 \, \text{N} \)[/tex].
3. Understand the concept of buoyant force:
The buoyant force is equal to the difference in the weight of the body in air and the weight of the body when submerged in the fluid (kerosene in this case).
4. Calculate the upward thrust (buoyant force):
To find the upward thrust, subtract the weight of the body in kerosene from the weight of the body in air:
[tex]\[
\text{Upward thrust} = \text{Weight in air} - \text{Weight in kerosene}
\][/tex]
5. Perform the calculation:
[tex]\[
\text{Upward thrust} = 5.5 \, \text{N} - 3.0 \, \text{N}
\][/tex]
6. Result:
[tex]\[
\text{Upward thrust} = 2.5 \, \text{N}
\][/tex]
Therefore, the upward thrust on the body when it is completely immersed in kerosene is [tex]\( 2.5 \, \text{N} \)[/tex].
