2172. You are using tackle number 10 as shown in illustration D029DG below to lift a weight. The hauling part of this tackle is bent to the weight hook (w) of tackle number 4. What is the mechanical advantage of this rig?

The mechanical advantage of a compound tackle is the product of the mechanical advantages of the individual tackles. Tackle 10 has 5 supporting parts of line, and tackle 4 has 4, resulting in a total mechanical advantage of 5 x 4 = 20.