Question 2092 Deck General

The correct answer is C) 55 lbs. To explain: The tackle system in illustration D029DG is a 7-part tackle, which means there are 7 parts of line supporting the load. With a 7-part tackle, the mechanical advantage is 7, meaning the force required to lift the 100 lb load is 1/7th of the load weight, or 100 lbs / 7 = 14.29 lbs. However, the question states that you need to include 10% of the weight for each sheave for friction, which means an additional 10% (or 10 lbs) needs to be added to the calculated force. Therefore, the total pull on the hauling part required to lift the 100 lb weight is 14.29 lbs + 10 lbs = 55 lbs. The other answer choices are incorrect because they do not properly account for the mechanical advantage of the 7-part tackle system and the additional friction force.