A pendulum with a light rigid rod

AI Thread Summary
To determine the angle at which the tension in the pendulum's suspension equals the weight, conservation of energy can be applied to find the speed of the mass at various points. The total force acting on the mass can be analyzed using Ftotal = ma to establish the relationship between tension and weight. The calculated angle is suggested to be 71 degrees from the vertical. Participants encourage using these principles to derive the solution effectively. Understanding these concepts is crucial for solving the problem accurately.
Leonidu
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Homework Statement



The pendulum with a light rigid rod l has a mass m attached to it's end. It is put in a horizontal position and released from rest. At what angle grom the vertical will the tension in the suspension equal to the weight in magnitude?

Homework Equations





The Attempt at a Solution


the answer should be 71 deg , but I have no idea how to solve it
 
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Welcome to PF!

Hi Leonidu! Welcome to PF! :wink:

Use conservation of energy to find the speed, then use Ftotal = ma …

what do you get? :smile:​
 
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