What is the Energy Absorbed in a Charpy Test with a 50-Degree Initial Angle?

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Homework Statement



What would be the energy absorbed if a 60-lb, 31.5-in pendelum was released from an angle of 50 degrees hit a test bar, then rose to an angle of 20 degrees after impact?

This is done using a charpy test

Homework Equations



Not sure where to begin


The Attempt at a Solution



Not sure where to begin
 
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Discussion

Why do you suppose the pendulum only has a 20 degree rise after the impact, when the initial angle was 50 degrees? What's different?
 

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