Question

26. The diagram below shows a pulley arrangement:


(i) Copy the diagram and mark the direction of tension
on each stand of the string.
(ii) What is the velocity ratio of the arrangement?
(iii) If the tension acting on the string is T, then what is
the relationship between T and effort E?
(iv) If the free end of the string moves through a
distance x, find the distance by which the load is
raised.


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Answer 1

Answer:

Tension will act always in opposite direction..

of the pulley...

In case of load it is hanged by two strings to the pulley with tension T in them..

Therefore it will result into 2T in the single string through which load has been hanging..

Now, when the string through B moves x distance upwards, then the string to pulley A will also move x distance upwards each resulting to move 2x distance upwards...

So when we differentiate displacement of pulley A and B we get v and 2v

Therefore the we get the ratio as

Va/Vb = 1/2

Hope it helps...

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