Two cranes are lifting identical loads of $1000\text{ N}$. Crane X uses a single fixed pulley, while Crane Y…

Two cranes are lifting identical loads of $1000\text{ N}$. Crane X uses a single fixed pulley, while Crane Y uses a combination of 4 supporting rope segments in a block and tackle pulley system. How does the effort required compare?
  1. Crane X requires $250\text{ N}$ while Crane Y requires $1000\text{ N}$
  2. Both require $1000\text{ N}$
  3. Crane Y requires $250\text{ N}$ while Crane X requires $1000\text{ N}$
  4. Crane Y requires $500\text{ N}$ while Crane X requires $2000\text{ N}$

Solution

Crane X has an MA of 1 requiring $1000\text{ N}$, whereas Crane Y with 4 supporting rope segments divides the load by 4 ($1000\text{ N} / 4 = 250\text{ N}$).

Asked in: Homi Bhabha Practice

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