A construction worker uses a bosun's chair arrangement (as shown in the figure (Figure 1)) to lift himself to his workplace. The rope may be considered massless and the pulley may be considered massless and frictionless. The combined mass of the worker and the chair is 113.0 kg.
During one part of his lift, the worker is lifting himself (and the chair) with constant speed. Questions (A)-(B) are concerning this part of the lift.
Part A: What is the tension in the rope?
Part B: What is the Up-Down component of the contact force exerted on the pulley due to its attachment to the ceiling? Let Up be positive. Remember that the pulley is effectively massless.
Part C: What is the tension in the rope? As the worker nears the top of his lift, he needs to slow down and gradually come to rest. At one moment while he is going upwards and slowing down, his speed is decreasing at a rate of 79.0 cm/s2. Questions (C)-(D) concern this moment in time. Consider the worker and the chair as a single object.
Suppose now that, instead of the situation depicted in the figure, the worker doesn't touch the rope but instead allows the rope to pass untouched to the ground where it will be pulled by a heavy (and strong) coworker; on both sides of the pulley, the rope is still vertical. In this case, the worker is simply riding in the chair; the coworker is doing the pulling and thus the lifting. Consider the worker and the chair in which he is riding as a single object. The Rope is Pulled by a Co-Worker on the Ground Part D: What is the Up-Down component of the contact force exerted on the pulley due to its attachment to the ceiling? Let Up be positive. Remember that the pulley is effectively massless.
Part D: If, in this scenario, the lift is being made at constant speed, what will be the tension in the rope?
Part E: Suppose the coworker weighs 1313.2 N. If the lift is being made at constant speed, what is the Up-Down component of the contact force on the coworker by the ground on which he is standing? Let Up be positive
Part F: If, in this scenario, the lift is being made at constant speed, what will be the Up-Down component of the total contact force exerted on the pulley due to its attachment to the ceiling? Let Up be positive. Remember that the pulley is effectively massless.