(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A small metallic bob is suspended from the ceiling by a thread of negligible mass. The ball is then set in motion in a horizontal circle so that the thread describes a cone.

Given: Length of string = 2.8m

Angle between string and vertical: 21 degrees

Mass of bob: 2.9kg

2. Relevant equations

I = mr^2

w = square root of [g/(lcos(theta)]

Momentum = I x w

3. The attempt at a solution

I first calculated the angular velocity by plugging numerical values into the equation and got 1.936 rad/s. Then, I found out the moment of inertia of the bob by multiplying 2.9 x 2.8^2 [this is the step I'm not sure of], but the answer wasn't right. Is there something I missed out?

Thank you for your help!

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# Homework Help: Angular Momentum of a conical pendulum

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