The efficiency of the pulley system shown above is 80%. f...
The efficiency of the pulley system shown above is 80%. find the effort E required to lift the load of 1200N
A.
275N
B.
325N
C.
375N
D.
573N
Correct answer is C
VR = No. of pulleys = 4
Efficiency = M.AV.R
cross multiply
8010∗V.R = M.A
8010∗4 = M.A
M.A = 3.25
where M.A = loadeffort
∴ Effort = 12003.2∗V.R
= 375N