The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms-2)
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Correct Answer: Option D
Explanation:
Efficiency =
M.A/V.R
x 100%
=
80/100
=
120 x 10/E
E = 250N
Efficiency =
M.A/V.R
x 100%
=
80/100
=
120 x 10/E
E = 250N