Question 2093 Deck General
70% to passYou are using tackle number 2 as shown 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?
A
50 lbs.
B
55 lbs.
C
60 lbs.
D
110 lbs.
AI Explanation
The correct answer is C) 60 lbs. The reasoning is as follows: For a tackle system with 2 sheaves, the mechanical advantage is 2. This means that the load weight of 100 lbs is distributed across 2 parts of the line. However, to account for the 10% friction loss per sheave, an additional 20% of the load weight must be added to the hauling part pull. Therefore, the required pull on the hauling part is 100 lbs / 2 + (100 lbs * 0.2) = 60 lbs. The other options are incorrect because they do not properly account for the 10% friction loss per sheave in the tackle system.
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