A block and tackle is used to raise a 72.0 N crate 12.3 m from the loading dock to the ship. This requires a force of 25.0 N to be applied by the longshoreman.
Part 1: What is the mechanical advantage of the block and tackle?
Part 2: How much rope must be pulled? Note: Assume that IMA = MA.
Part 3: The longshoremen have only a 40 m rope that they are told not to cut. They use this for the block and tackle. How does this affect the efficiency of the block and tackle?
**how do we solve these? :/ thanks @Michele_Laino !!:)

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part 1
the requested advantage is given by the subsequent ratio:
\[\large R = \frac{{72}}{{25}}\]

oh okay! so we get 2.88 is the requested mechanical advantage?

yes! Whereas the efficiency E, of our machine, is:
\[\Large E = \frac{{25}}{{72}} = ...\]

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