For lifting 12500 lbs with a single-part line block and tackle, the load on block A is approximately which value?

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Master the XD03.13 Industrial Rigging and Signaling Exam with flashcards and multiple choice questions. Each question includes hints and explanations. Prepare effectively for your exam!

Multiple Choice

For lifting 12500 lbs with a single-part line block and tackle, the load on block A is approximately which value?

Explanation:
When you use a block and tackle, the moving block (block A) is pulled by more than one rope segment. The forces from those rope legs act in different directions, so you don’t just add their magnitudes—you combine them as vectors. In a common single-part line arrangement, the two equal tensions acting on the moving block form a resultant that is about the diagonal of the two-force directions, which is roughly the square root of 2 times a single tension. When you lift 12500 lb, that setup leads to the moving block experiencing about 12500 × √2 ≈ 17625 lb. That’s why the best approximate value is 17625 lb.

When you use a block and tackle, the moving block (block A) is pulled by more than one rope segment. The forces from those rope legs act in different directions, so you don’t just add their magnitudes—you combine them as vectors. In a common single-part line arrangement, the two equal tensions acting on the moving block form a resultant that is about the diagonal of the two-force directions, which is roughly the square root of 2 times a single tension. When you lift 12500 lb, that setup leads to the moving block experiencing about 12500 × √2 ≈ 17625 lb. That’s why the best approximate value is 17625 lb.

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