A pulley on a frictionless shaft has a constant tension T applied at its outer rim of radius R and a weight W tied to a string wrapped around its inner shaft of radius r. If the system is to remain at rest, what must the tension T be?

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative. 

The answer is a.  i hope this

It would be c hope this out