The velocity ratio of a block and tackle system of pulleys is 5. If its efficiency is 80 %, then by
applying an effort of 200N, what maximum load can be lifted by the pulley system?
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The labelled diagram of the system of block and tackle system of pulleys is shown indicating clearly the points of application and direction of load and effort.
(ii) Given : Velocity ratio (V.R.)=4, Load =4T, Effort =T
Mechanical advantage (M.A.)=
Effort
Load
=
T
4T
=4
Hence, the mechanical advantage of the given pulley system is 4.
Explanation:
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