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The diagram in Figure shows the combinat...

The diagram in Figure shows the combination of two pulleys `P_(1) and P_(2)` used to lift up a load W.
(a) State the kind of pulleys `P_(1) and P_(2)`.
(b) State the function of the pulley `P_(2)`.
(c) If the free end C of the string moves througha distance x, by what distance is the load W raised ?
(d) What effort E has to be applied at C to just raise the load W=20 kgf ? Neglect both the weight of the pulley `P_(1)` and friction.

Text Solution

Verified by Experts

(a) `P_(1)` is the movable pulley while `P_(2)` is the fixed pulley.
(b) The fixed pulley `P_(2)` is used to change the direction of effort to be applied, from upward direction to downward direction.
(c) If the free end C of the string moves through a distance x, the load W will rise by a distance x/2.
(d) Given W=20kgf, E=?
In equilibrium, W=2T and E=T
`therefore` Effort needed E=`(W)/(2)=(20kgf)/(2)=10kgf`.
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