Centripetal Force of 2 Orbiting Masses

Think about the question below. Only one of the answers listed is correct. We'll do some (but probably not all) of these questions in the lectures when you will all be asked to vote on which answer you think is correct. (Soon afterwards, you'll be able to see your responses, and those of the whole class at EVAF.)

Graphic - No title - twomassesincircle
Two equal masses m resting on a frictionless table are joined by a string. They rotate at speed v. The tension in the string is:
1
T=0
2
\[T=\frac{mv^2}{r}\]
3
\[T=\frac{2mv^2}{r}\]