Recent content by Waich

Ah right so the r in my second line of working should be 0.35m. However, it's still a little off :( I'm using 0.415 as the distance between CoM and the axis. I'm starting to think that my experimental values are off...

Well using the standard result for the moment of inertia at the centre of mass I get this: I = 1/12 * ML^{2} + Mr^{2} I = 1/12 * 0.05 * 0.8^{2} + 0.05 * 0.415^{2} I = 0.01128 Then for moment of inertia of the weight I get this: I = m * x^{2} I = 0.01 * 0.74^{2} I = 0.005476 So Total...

I can work out the centre of mass (it's 33.5cm from the bottom) but I don't know how to work out the moment of inertia from there. Also, the pendulum can't be thought of as a point mass otherwise it turns into a simple pendulum (although I wish it could, this would be a hell of a lot easier...

Homework Statement I have a uniform ruler, 80cm long weighing 50g. I'm attaching a weight at one end, 1cm from the bottom. I'm assuming that its a point mass to make things easier. This weighs 10g. The ruler has an axis 5 cm from the top. What's the moment of inertia? Homework EquationsThe...