- #1

YauYauYau

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## Homework Statement

A simple pendulum of length ξ and mass m is suspended from a point on the circumference of a thin massless disc of radius α that rotates with a constant angular velocity ω about its central axis as shown in Figure. Find the equation of motion of the mass m.

## Homework Equations

L = T - V

## The Attempt at a Solution

Firstly, I know I should find its x' and y' which representing its velocity.

i.e. T - V = 1/2 m ( x_dot

^{2}+ y_dot

^{2}) - mgy

However, I don't know where I should start with to find their x and y.

Thanks.