1. The problem statement, all variables and given/known data A pendulum consists of a light rigid rod of length 250 mm, with two identical uniform solid spheres of radius of radius 50 mm attached one on either side of its lower end. Find the period of small oscillations (a) perpendicular to the line of centres and (b) along it. 2. Relevant equations Equation I have come across is 3. The attempt at a solution From the parallel axis theorum the moment of inertia of a pendulum and sphere is mr2+2/5mr2. As there is two spheres I added on another 2/5 mr2. The answers for both parts are (a) 1.011 s and (b) 1.031 s. I have gotten answers close to, but not quite these answers, ie 1.2 s or 1.3 s. I feel like this is an easy question and that I'm after doing something stupid, so any guidance would be greatly appreciated.