Final answer:
The question involves calculating the torque about point B for three forces. This involves using the definition of torque as the cross product of the lever arm distance and the applied force. Additional concepts such as angular velocity, acceleration, and displacement are also discussed as they relate to rotational motion.
Step-by-step explanation:
The student is asking about various aspects of rotational dynamics. The moment a force creates about a point (in this case, point B) can be described by the torque exerted by that force. Torque (τ) is the product of the force (F) applied and the perpendicular distance (r) from the point of rotation to the line of action of the force, represented by the equation τ = r × F, where '×' denotes the cross product.
When considering angular velocity (ω), it is the rate of change of angular displacement over time. Angular acceleration (α), on the other hand, is the rate of change of angular velocity over time, which can be calculated using the rotational analog of Newton's second law, α = net τ / I, with I being the moment of inertia. Lastly, angular displacement refers to the change in the rotational angle.