If a block and tackle arrangement were...

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Question 1 of 205eccef9dbacbc34ba4d45df1

If a block and tackle arrangement were rigged as shown in figure "D" in the illustration, the amount of force "P" required to hold the 423 pound load stationary would be __________. See illustration GS-0110.

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🔍 Key Concepts

• Count the number of load‑supporting parts of line in the tackle shown in figure D to find the mechanical advantage (ignoring friction). • Use the basic relation Mechanical Advantage (MA) = Load / Effort to estimate the pull P needed to hold the load. • Be clear about where the standing (dead) end of the line is made fast; this changes how many parts of line actually support the load.

💭 Think About

• Looking at figure D only, how many rope segments are actually sharing the 423 lb load on the moving block? • Once you know the mechanical advantage, what value do you get if you divide 423 lbs by that MA, and which choice is closest to that value (allowing for some frictional loss)? • Does the direction of pull in figure D (up or down) change how many parts of line carry the load, or only the convenience of operation?

✅ Before You Answer

• Correctly count the supporting parts of line attached to the moving block in figure D. • Verify whether the dead end of the line is on the fixed block or the moving block in this rig, and adjust the MA accordingly. • After computing the ideal effort (no friction), check which answer choice reasonably allows for small friction losses in a real block and tackle.

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