Question 1646 Deck General

The correct answer is D) 52 lbs. To explain: 1) With tackle number 3, there are 3 parts supporting the load, so the effective weight of the 120 lb load is reduced by a factor of 3. This gives an effective load of 120 / 3 = 40 lbs. 2) Additionally, the problem states to include 10% of the weight for each sheave for friction. With 3 sheaves, this adds 30% to the effective load, for a total of 52 lbs (40 lbs + 30% of 40 lbs). 3) The other options are incorrect because they do not properly account for both the mechanical advantage of the tackle system and the friction losses in the sheaves.