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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1)MA =load /effort
=720/180
=4
3) efficiency = MA/VR { VR=2^n-1 }
= 31
= 12 percent
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