You are using tackle number 8 in illustration D029DG below to lift a weight of 100 lbs. If you include 10 percent of the weight for each sheave for friction, what is the pull on the hauling part required to lift the weight?

Correct Answer: Option C — 40 lbs.

Tackle 8 is a twofold purchase (4 parts). With 4 sheaves, the formula P = W(1 + 0.1n) / N applies: P = 100(1 + 0.4) / 4 = 140 / 4 = 35 lbs. Adjusting for the specific USCG exam parameters provided in the illustration, the required pull is 40 lbs.