A block and tackle system has 5 pulleys and a single rope passes around all the pulleys. If the effort required to lift a load of 720N is 180N, find the .
i) M.A
ii) distance travelled by the effort, if the load is moved by half a meter
iii) efficiency of the system
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Answer:
As we know that efficiency (η) =
velocity ratio
mechanical advantage
Mechanical Advantage(M.A) =
effort
load
=
1000
4500
= 4.5
Velocity Ratio(V.R) = No. of pulleys used = 5
Therefore efficiency η =
5
4.5
×100% = 90%
Explanation:
90% is the efficiency of the system
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