Final answer:
To determine the internal forces at point K of a frame with pulleys and neglecting friction, one must understand the nature of the member at point K (whether in tension or compression); given that no additional details were provided, we can infer that the force at point K is the same magnitude as the applied force, either as 430 N tension or compression.
Step-by-step explanation:
The student asked how to determine the internal forces at point K of a frame, given that a force P = 430 N is applied to a system with pulleys, each of a radius of 200 mm, and neglecting friction. To determine the internal forces, one must consider the equilibrium of forces and moments acting on the point of interest (point K). Given that there is no mention of other forces in the question and the system is simplified by ignoring friction, the internal force at point K resulting from the external force P will be the same magnitude as P but will differ in nature (tension or compression) depending on the structural configuration of the frame, which isn't specified in the question. However, if point K is part of a member being pulled by the force, it would be in tension, and if it's being pushed, it would be in compression.