The bar shown weighs 20 lb and is pivoted about a point C that is 1 ft from end B. The other end is pressed against a vertical spring until the spring is compressed 2 in for the position shown. The rod is released from this position, and then comes to a vertical position. a. For a spring constant between 800 and 2000 lb/in, plot the angular velocity of the rod at the vertical position vs the spring constant. Use increments of 100 lb/in. b. When the rod passes through 30 degrees above the horizontal, find the tangential component of the reaction at O. 6 ft 1 ft A

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Center of Gravity and Centroid

The term center of gravity indicates the position or location of a point about which the whole weight of a body or system is supposed to be concentrated, which means the whole weight of the body or system works through this point. It is closely related to mass distribution. For all positions of the body, the center of gravity would be a single point.