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Fig 3.40 show...

Question

Fig 3.40 shows a block and tackle system of pulleys used to lift a load.
What is the mechanical advantage of the system ?

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Solution

The mechanical advantage of the system
$M A = \frac{L o a d}{e f f o r t} = \frac{4 T}{T} = 4$

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In fig shows a block and tackle system of pulleys used to lift a load .

(a) How many strands of tackle are supporting the load ?

(b) Draw arrows to represent tension T in each strand.

(c) What is the mechanical advantage of the system ?

(d) When load is pulled up by a distance 1 m, how far does the effort end move ?

(e) How much effort is needed to lift a load of 100 N ?

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