The crank OA rotates in the vertical plane with a constant clockwise angular velocity ?0 of 4.9 rad/s. For the position where OA is horizontal, calculate the force under the light roller B of the 17.1-kg slender bar AB.

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.