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Mechanical Advantage

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Question

Figure shows a block and tackle system of pulleys used to lift a load. How many strands of tackle are supporting the load?

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Solution

In general, if the total number of pulleys used in both the blocks is n and the effort is applied in the downward direction, then the tension in the n segments of the string supports the load.
Here n = 4
So, 4 strands of tackle are supporting the load.

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