ICSE Class 10 Answered
A block and tackle system has 4 Pulley to lift the load of 840 Newton through a distance of 12 metre the weight of the movable Pulley is 20 Newton
Asked by shashwat12pandey | 15 Mar, 2021, 03:12: AM
Expert Answer
Effort E to lift the load L = 840 N is given as
E = ( L+w ) / n
where w is weight of moveable pulley and n is number of pulleys
Hence Effort E = ( 840+20)/4 = 215 N
Mechanical advantage , MA = n - (w/E) = 4 - (20/215) = 3.907
Efficiency η = 1 - [ w / ( nE ) ] = 1 - [ 20 / ( 4 × 215 ) ] = 0.977
Answered by Thiyagarajan K | 15 Mar, 2021, 08:28: AM
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