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Quick answer: C is the only option with the right units (or dimensions), so it's the answer.
Thanks heaps! Didn't realise radians per second was the same as s^-1. Also is there a method to doing it if this was a short answer?Quick answer: C is the only option with the right units (or dimensions), so it's the answer.
(As we know, the dimensions of angular velocity are inverse time (units of which is s-1); units of option C is ((m s-2)/m)1/2 = s-1. It is quick to check that none of the other options have the right units for angular velocity (and so cannot be correct). The first two (A and B) are dimensionless, as they just involve the ratio of two lengths. The last option is the inverse of C, so the units are s, which is wrong.)
Thanks heaps! Didn't realise radians per second was the same as s^-1. Also is there a method to doing it if this was a short answer?
Thanks, didn't know we were allowed to use horizontal forces because the question was like "taking into account only tension and gravity"