Question 1647 Deck General

The correct answer is C) 40 lbs. The pull on the hauling part required to lift the 100 lb weight is 40 lbs. This is calculated by taking the weight of 100 lbs and adding 10% for friction at each of the 3 sheaves, which results in a total pull of 40 lbs. The other answer choices are incorrect because: A) 120 lbs is too high, as it does not account for the mechanical advantage of the 3-part tackle. B) 55 lbs is too high, as it does not include the 10% friction at each sheave. D) 37 lbs is too low, as it does not fully account for the 10% friction at each of the 3 sheaves.