Final answer:
B. Keep your lifeline within a 30-degree angle of the anchor point The question pertains to the calculation of the stretch in a nylon rope used by a mountain climber, which involves physics concepts such as stress, strain, and elastic deformation. Without the specific modulus of elasticity for nylon, the exact stretch cannot be calculated here. Nylon ropes exhibit less stretch compared to bungee cords, which are meant for extensive elastic deformation.
Step-by-step explanation:
The problem involves calculating elastic deformation and relies on understanding the physical properties of materials. To find out by how much the nylon rope stretches, one would typically use Hooke's Law and material properties such as Young's modulus. Considering the diameter of the nylon rope and the weight of the climber, one could calculate the stress and strain on the rope to determine the amount of stretch.However, without additional material properties, exact calculations can't be provided. As for the behavior of nylon ropes under stress, they are known to have some elasticity but significantly less than a bungee cord. Bungee cords are designed to stretch considerably more than a nylon rope, so if the rope stretched like a bungee cord, it would not be consistent with the properties of typical climbing equipment.
The correct practice for tying off to an anchorage is option B, which is to keep your lifeline within a 30-degree angle of the anchor point. This ensures that there is minimal slack in the lifeline, which reduces the risk of falling. Option A is incorrect because only a qualified person should certify anchor points. Option C is incorrect because you should never disconnect your lanyard until you have safely reached another anchor point. Option D is also incorrect because working directly under the anchorage increases the risk of falling objects.