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## Homework Statement

A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= 250 g and length l= 25 cm. Use g=10 m/s2 for the gravitational acceleration, and the ruler has a uniform mass distribution. Note that there is no friction whatsoever in this problem.

(a) What is the angular speed of the ruler ω when it is at an angle θ=30∘? (in radians/sec)

The angle is from the vertical.

## Homework Equations

I'm not sure on which method to use. I was thinking either conservation of energy or using the centre of mass equations.

## The Attempt at a Solution

Various attempts that have not yielded correct answers.