1(iii)
A block and tackle system has two pulleys in the movable block. In an ideal condition if L = 5T, then the number of pulleys in the fixed block is equal to:
(L is the load and T is the tension)
- (a)2
- (b)3
- (c)4
- (d)5
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3
Reason — In a block and tackle system in which the effort is applied in the downward direction, the tension in the n segments of the string supports the load, so
L = nT
where n is the total number of pulleys used in both the blocks.
Here, L = 5T, so n = 5.
Then,
Number of pulleys in the fixed block = Total number of pulleys - Number of pulleys in the movable block = 5 - 2 = 3