Known values:

Problem Statement:

A slender beam weighing $570$ lb $,$ is at rest and supported as pictured until the pin at A suddenly fractures. For the instant just after fracture of the pin, determine the following:

Assume the beam does not lose contact with the roller.

Use rightward, upward, and counterclockwise as positive when reporting your answers.

Answers:

The horizontal acceleration component of the mass center:

The beam's angular acceleration:

The vertical acceleration component of the mass center:

The $($vertical$)$ reaction at B :

Be sure to include units with your answers.