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It depends on where the rope is:

e.g. if an object is attached to a ceiling with a rope and we disregard the buoyancy force of air (in small cases we usually can) then F(tension)=mg(weight) but if its in a liquid being tied down to the floor then F(tension)=F(buoyancy)-mg(weight)- --> F(buoyancy) = ρ(density of the fluid)*V(the volume of the part of the object that is immersed in the liquid)*g

Naturally there are much more complex examples but these are the most common ones early in your physics education.

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13y ago

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