Answer:
The causes of this resistive force are molecular adhesion, surface roughness, and deformations.
Explanation:
Adhesion is the molecular force resulting when two materials are brought into close contact with each other.
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Force vector is given as
now we need to find the magnitude of this force
as we know that
so here we will find the net force
so it is having magnitude as 35.2 N
The uncertainty of the measurement is 0.001 gm.
The uncertainty in the measurement of a physical quantity is given as how precisely we can measure that, in this case as we can see that the mass of the sodium chloride is precisely given as 29.732 gm, this means the electronic scale is precise to 0.001 gm and round of the values after that which means there is a uncertainty of 0.001 gm.