Homework Help Overview
The problem involves lifting a 60N box using a system of three pulleys and two ropes. The setup includes considerations of static equilibrium, tension in the ropes, and the forces acting on the pulleys.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants discuss the necessity of drawing free body diagrams (FBDs) for the pulleys and the box. There are questions about the number of FBDs required and the relationships between the tensions in the ropes.
- Some participants explore the implications of static equilibrium and the effects of massless and frictionless assumptions on tension calculations.
- There are inquiries about the correctness of equations used to calculate tension and the net force acting on the system.
- Participants consider how to relate the tensions in different parts of the pulley system and whether the tensions are equal across the ropes.
Discussion Status
The discussion is ongoing, with participants actively questioning their assumptions and calculations. Some have proposed equations based on their FBDs, while others are clarifying the roles of different pulleys and tensions. There is no explicit consensus on the final values of tension or the force the man must exert, but several participants are working through their reasoning collaboratively.
Contextual Notes
Participants note that the system is assumed to be in static equilibrium, and there are discussions about the implications of this assumption on the calculations. There is also mention of the need to focus on specific pulleys to simplify the analysis.
The force must be greater than 12 N to lift it up.